AMD Radeon HD 7870 And 7850 Review: Pitcairn Gets Benchmarked
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If you follow the graphics industry, you probably already knew today’s AMD Radeon HD 7800-series launch was happening. The company told us to expect this back in December when it introduced Radeon HD 7970. It reminded us in January when the Radeon HD 7950 debuted, and again in February during the Radeon HD 7770 and 7750 briefings.
Consequently, we’re also not surprised that, as the Radeon HD 7870 and 7850 became public knowledge, supply of the Radeon HD 6970 and 6950 dried up. After all, it’s hard to recommend last generation’s card, still priced competitively, when it’s no longer for sale. The new models replace those older cards with similar suggested prices of $349 for the 7870 and $249 for the 7850.
Another Paper Preview Launch
Unfortunately, although we’re able to talk about the performance of Radeon HD 7870 and 7850, you won’t be able to buy the card until at least March 19th, AMD tells us. The company says that, because CeBIT and the Game Developers Conference fall so close to the official launch, it’d be difficult to keep information about the cards under wraps. Regardless of the explanation, it sucks to wait another two weeks for street pricing and a better feel for availability.
Cynicism aside, we’re still technology geeks at heart, and we’re desperately curious to know how the 7800-series cards measure up to the Radeon HD 6900s, which earned our affections in the past for their conservative power use, excellent CrossFire scaling, and rich display connectivity compared to Nvidia’s GPUs with two independent pipelines.
This is the third distinct Graphics Core Next-based ASIC from AMD in as many months. Code-named Pitcairn, we finally have a solution in between the flagship Tahiti and the entry-level Cape Verde. The graphics processor is composed of 2.8 billion transistors in a 212 mm2 die manufactured on TSMC’s 28 nm lithography node. That’s nearly twice as large as the GPU at the heart of Radeon HD 7770, but around two-thirds of Tahiti, which drives the Radeon HD 7970.
Pitcairn hosts 20 compute units, each with four vector units made up of 16 stream processors and a single texture unit. In an uncut GPU, those numbers multiply out to 1280 total shaders and 80 texture units. AMD shears off four compute units from Pitcairn to create the Radeon HD 7850, resulting in 1024 shaders 64 texture units.
The GPU’s back-end is made up of eight render partitions, each with four full-color ROPs, totaling 32 ROPs. Four 64-bit memory controllers yield an aggregate 256-bit memory bus. AMD doesn’t make any changes to this part of the chip; both the Radeon HD 7870 and 7850 sports identical back-ends.
Swipe to scroll horizontally
Header Cell — Column 0 | Radeon HD 7870 | Radeon HD 6970 | Radeon HD 7850 | Radeon HD 6950 |
---|---|---|---|---|
Stream processors | 1280 | 1536 | 1024 | 1408 |
Texture Units | 80 | 96 | 64 | 88 |
Full Color ROPs | 32 | 32 | 32 | 32 |
Graphics (Shdr) Clock | 1000 MHz | 880 MHz | 860 MHz | 800 MHz |
Texture Fillrate | 80 Gtex/s | 84. 5 Gtex/s | 55 Gtex/s | 70.4 Gtex/s |
Memory Clock | 1200 MHz | 1375 MHz | 1200 MHz | 1250 MHz |
Memory Bus | 256-bit | 256-bit | 256-bit | 256-bit |
Memory Bandwidth | 153.6 GB/s | 160 GB/s | 153.6 GB/s | 160 GB/s |
Graphics RAM | 2 GB GDDR5 | 2 GB GDDR5 | 2 GB GDDR5 | 1-2 GB GDDR5 |
Die Size | 212 mm2 | 389 mm2 | 212 mm2 | 389 mm2 |
Transistors (Billion) | 2. 8 | 2.64 | 2.8 | 2.64 |
Process Technology | 28 nm | 40 nm | 28 nm | 40 nm |
Power Connectors | 2 x 6-pin | 1 x 8-pin, 1 x 6-pin | 1 x 6-pin | 2 x 6-pin |
Maximum power (TDP) | 175 W | 250 W | 130 W | 200 W |
Price | $349 MSRP | $350-$410 (EOL) | $249 MSRP | $250 (1 GB, EOL)$270-$300 (2 GB, EOL) |
In general, AMD’s Radeon HD 6900 family features more shaders and texture units, while the 7800s operate at higher clock rates. Remember also that both line-ups also employ different architectures optimized for different things. VLIW4 was the product of much evolution, and hence quite mature. Meanwhile, GCN is much newer. We’ve seen it completely tank in DirectX 9-class applications, and then deliver stellar performance in more modern titles.
All of the cards in the above chart feature 256-bit memory interfaces feeding 32 ROPs, but the 6900 series’ higher memory clock rates facilitate a little more bandwidth.
Interestingly, the Radeon HD 6950 only proffers about 10% fewer shaders than the Radeon HD 6970. In contrast, the Radeon HD 7850 comes armed with a roughly 25% deficit compared to Radeon HD 7870. AMD seems to have decided that it needed to spread its mid-range cards further apart from each other. I’ve often wondered if the Radeon HD 6950 cannibalized Radeon HD 6970 sales because they were so similar (surely it didn’t help that 6950s were getting updated via firmware to look even more like 6970s) That could be what AMD is trying to avoid this time around.
Although it’s tempting to look at raw specifications and draw comparisons, you really can’t, on account of the dissimilar architectures. We can, however, point out that all of AMD’s GCN-based cards put a special emphasis on maintaining exceptional performance at lower maximum power. The Radeon HD 7750 doesn’t even need a dedicated PCIe power connector, and yet its performance is often comparable to the Radeon HD 5770/6770. With maximum TDPs at 175 and 130 W, the Radeon HD 7870 and 7850 sport power ceilings that are 75 and 70 W lower than their predecessors, respectively. The Radeon HD 7870 requires two six-pin PCIe power connectors, and the Radeon HD 7850 only needs one. Lower power means less heat. Less heat translates to more conservative cooling. And that leaves the door open for gaming enthusiasts to enjoy quieter systems that go easier on the power bill. These cards might not even necessitate a power supply upgrade, if your machine is reasonably modern.
A Sizable Gap
We’re curious about the space between AMD’s $250 Radeon HD 7850 and its $160 Radeon HD 7770. Like it or not, the Radeon HD 6800s are gone for good. AMD isn’t taking orders on the 6870, 6850, or 6790. The company won’t comment on future products, but we find it hard to believe it’d abandon the $180-$230 market currently inhabited by the GeForce GTX 560, 560 Ti, and Radeon HD 6870. That leaves two likely possibilities for the future: a cheaper 1 GB version of the Radeon HD 7850, or perhaps a crippled version of the 7850 that might populate a lower position in the hierarchy.
Radeon HD 7870 and 7850
Officially, AMD gives its Radeon HD 7870 the same GHz Edition suffix as the Radeon HD 7770, indicating only that the core breaks the completely arbitrary gigahertz barrier.
As far as appearances go, the Radeon HD 7870 is quite similar to the Radeon HD 6870. It’s 9.5” long with two six-pin auxiliary power inputs. The biggest functional difference between old and new is the loss of a DVI display connector. As with the flagship Radeon HD 7970, AMD says it got rid of the second DVI output to improve exhaust airflow. Two mini-DisplayPort connectors and a single HDMI port remain intact. Of course, the card’s style is a little different, adhering to the tapered end we’ve seen from other 7000-series models.
Keep in mind that the Radeon HD 7870 actually replaces the 6970, though, and not the 6870. The higher-end 6970 is an inch longer, and it requires eight- and six-pin power inputs to feed an additional 75 W.
We like the 7870’s more compact dimensions, but enthusiasts will be disappointed to learn about two notable omissions: a BIOS selector switch and dual CrossFire connectors. Unlike the Radeon HD 6900s, which scaled up to four cards in a CrossFire array, the Radeon HD 7870 and 7850 can only be used in pairs. Moreover, the lack of a backup firmware makes flashing the BIOS riskier.
The reference Radeon HD 7850 seems identical to the 7870 with one exception: a single six-pin power input (rather than two), reflecting the 7850’s lower 130 W typical board power rating.
But the reference card isn’t necessarily representative of what you’ll see at retail, and some of the models AMD showed us are actually quite a bit smaller.
Almost all of the partner boards share the same combination of one DVI-D output, a single HDMI connector, and twin mini-DisplayPorts. Based on the pictures AMD provided, the lone exception is XFX’s model with two DVI-D outputs.
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AMD Radeon HD 7850 2GB Review
Written by
Harry Butler
March 5, 2012 | 13:44
Tags: #7850
Companies: #amd
1 — AMD Radeon HD 7850 2GB Review2 — Test Setup3 — AMD Radeon HD 7850 2GB — Arma II Performance4 — AMD Radeon HD 7850 2GB — Battlefield 3 Performance5 — AMD Radeon HD 7850 2GB — Dirt 3 Performance6 — AMD Radeon HD 7850 2GB — Skyrim Performance 7 — AMD Radeon HD 7850 2GB Performance Analysis and Conclusion
Manufacturer: AMD
UK Price (as reviewed): TBC (estimated £200 inc VAT)
US Price (as reviewed): TBC (estimated $249 ex. tax)
Despite the HD 7800 series’ mid-range claims, the HD 7870 2GB is a pricey card thanks to what looks to be a £275 price tag. That still leaves a whopping £150 price gap in AMD’s line-up down to the £130 HD 7770 1GB and it’s into this gap that the HD 7850 2GB fits.
Its 212mm² 2.8 billion transistor Pitcairn Pro 28nm GPU is very similar to that of the HD 7870 2GB, with only clock speeds and CU count differing between the two. This means that Pitcairn Pro boasts both the same dual front-end layout as the high end Tahiti GPUs of the HD 7900 series and the full set of eight render back-end units for a total of 32 ROPs.
Click to enlarge — This is AMD’s stock version of the HD 7850 2GB, but most board partners will be using their own coolers and PCBs
The memory interface is also the same as the HD 7870 2GB, with a quartet of 64-bit dual channel memory controllers making for a 256-bit memory interface connected to 2GB of GDDR5. As both cards sport the same memory frequency of 1,200MHz (4.8GHz effective), this means they share a peak memory bandwidth of 153.6GB/sec.
With the same front-end and memory layout as the HD 7870 2GB you’d be forgiven for thinking there’s little between the two GPUs. Sadly, AMD has put the brakes on with the HD 7850 2GB when it comes to both CU count and core frequency. While the HD 7870 2GB sports 20 compute units (1,280 stream processors) running at 1GHz, the HD 7850 2GB packs 16 compute units (1,024 stream processors) running at 860MHz.
Click to enlarge — Pitcairn Pro offers four fewer CUs and a lower core frequency, but is otherwise the same as the HD 7870 2GB’s Pitcairn XT
Just as the HD 7870 2GB offered almost double the resources of the HD 7770 1GB, the HD 7850 2GB offers double the resources of the HD 7750 2GB; twice the stream processors, twice the memory, twice the front-end and twice the ROP count.
And just as with the HD 7870 2GB, the HD 7850 2GB also benefits from all the AMD gubbins we’re coming to expect from 7-series GPUs. That means support for up to six-display Eyefinity from a single card, PCI-E 3.0, two-card CrossFire and the excellent ZeroCore Power Technology.
However, we’re in something of an odd situation for this review, as AMD hasn’t actually furnished us with a stock review sample. Instead we received an HD 7850 2GB GPU fitted into a stock HD 7870 2GB PCB, albeit with just a single 6-pin PCI-E power connector. Our understanding is that stock cards will be a rarity, with almost every board partner using its own custom PCB and cooling layout. With card availability still two weeks out, this means we’ve been unable to perform any kind of meaningful power or thermal testing on a genuine HD 7850 2GB (our sample returned identical results as the stock HD 7870 2GB).
Click to enlarge — AMD sent us an HD 7850 2GB in an HD 7870 2GB PCB
With so much variety between manufacturers there’s likely to be little uniformity other than the need for a single 6-pin PCI-E power connector. AMD has told us that some boards will measure less than 200mm, which would certainly qualify the HD 7850 2GB as something of a pocket rocket card ideal for mini-ITX systems.
Pricing is also a little uncertain, but around £200 seems to be where most pre-orders are hitting. We’ll publish an update once we get our hands on a genuine HD 7850 2GB and once retail pricing becomes clearer.
Specifications
- Graphics processor AMD Radeon HD 7850 2GB, 8,60MHz
- Pipeline 1,024 stream processors, 32 ROPs
- Memory 2GB GDDR5, 4.8GHz effective
- Bandwidth 153.6GB/sec, 256-bit interface
- Compatibility DirectX 11.1, OpenGL 4.1
- Outputs/Inputs DVI, HDMI, 2 x mini DisplayPort
- Power connections 1 x 6-pin, top-mounted
- Size unknown PCB length, dual-slot
1 — AMD Radeon HD 7850 2GB Review2 — Test Setup3 — AMD Radeon HD 7850 2GB — Arma II Performance4 — AMD Radeon HD 7850 2GB — Battlefield 3 Performance5 — AMD Radeon HD 7850 2GB — Dirt 3 Performance6 — AMD Radeon HD 7850 2GB — Skyrim Performance 7 — AMD Radeon HD 7850 2GB Performance Analysis and Conclusion
XFX Radeon HD 7850 2GB
Top specifications and features
- Passmark score
- 3DMark Fire Strike Graphics test score
- Unigine Heaven 4. 0 test score
- GPU base clock
- RAM
Passmark
XFX Radeon HD 7850 2GB test score:
3694
Best score:
29325
Capacity
XFX Radeon HD 7850 2GB:
1583
Best score:
Memory
XFX Radeon HD 7850 2GB:
438
Best score:
General Information
XFX Radeon HD 7850 2GB:
65
Best score:
XFX Radeon HD 7850 2GB features:
149
Best score:
Description
The XFX Radeon HD 7850 2GB graphics card based on the GCN 1.0 architecture has 2800 million transistors, tech. process 28 nm. The frequency of the graphics core is 860 MHz. In terms of memory, 2 GB is installed here. DDR5, 1200MHz frequency and 154Gb/s maximum bandwidth. The texture size is 55 GTexels/s. FLOPS is 1.72.
In tests, the XFX Radeon HD 7850 2GB video card showed itself as follows — according to the Passmark benchmark, the model scored 3694 points. At the same time, the maximum number of points for today is 260261 points. According to the 3DMark benchmark, the video card scored 5106 points out of 49575 possible.
The version of Directx is 11.1. The OpenGL version is 4.2.
In terms of compatibility, the video card is connected via the PCIe 3.0 x16 interface. Regarding cooling, here the heat dissipation requirements are 130 watts.
In our tests, the video card scores 340436 points.
Why XFX Radeon HD 7850 2GB is better than others
No merits
- Passmark score 3694 . This parameter is lower than 22% of products
- 3DMark Fire Strike Graphics 5106 test score. This parameter is lower than 19% of products
- Unigine Heaven 4.0 test score 621 . This parameter is lower than 7% of products
- GPU base clock frequency 860 MHz. This parameter is lower than 68% of products
- RAM 2 GB. This parameter is lower than that of 32% of goods
- Memory bandwidth 154 GB/s. This parameter is lower than 55% of products
- Effective memory speed 4800 MHz. This parameter is lower than 25% of products
- GPU memory frequency 1200 MHz. This parameter is lower than that of 63% of goods
XFX Radeon HD 7850 2GB overview
Performance
Memory
general information
Functions
Ports
Tests in benchmarks
XFX Radeon HD 7850 2GB Review Highlights
GPU base clock
The graphics processing unit (GPU) has a high clock speed.
860MHz
max 2459
Average: 1124.9 MHz
2459MHz
GPU memory frequency
This is an important aspect calculating memory bandwidth
1200MHz
max 16000
Average: 1468 MHz
16000 MHz
FLOPS
A measure of the processing power of a processor is called FLOPS.
1.72TFLOPS
max 1142.32
Average: 53 TFLOPS
1142.32TFLOPS
RAM
2GB
max 128
Average: 4.6 GB
128GB
Texture size
A certain number of textured pixels are displayed on the screen every second.
Show all
55 GTexels/s
max 756.8
Average: 145.4 GTexels/s
756.8 GTexels/s
Architecture name
GCN 1.0
GPU Name
Pitcairn
Memory bandwidth
This is the speed at which the device stores or reads information.
154GB/s
max 2656
Average: 257. 8 GB/s
2656GB/s
Effective memory speed
The effective memory clock speed is calculated from the size and information transfer rate of the memory. The performance of the device in applications depends on the clock frequency. The higher it is, the better.
Show all
4800MHz
max 19500
Average: 6984.5 MHz
19500MHz
RAM
2GB
max 128
Average: 4.6 GB
128GB
GDDR Memory Versions
Latest GDDR memory versions provide high data transfer rates for improved overall performance
Show all
5
Mean: 4.9
6
Memory bus width
A wide memory bus indicates that it can transfer more information in one cycle. This property affects the performance of the memory as well as the overall performance of the device’s graphics card.
Show all
256bit
max 8192
Average: 283.9bit
8192bit
Thermal Dissipation (TDP)
Thermal Dissipation Requirements (TDP) is the maximum amount of energy that can be dissipated by the cooling system. The lower the TDP, the less power will be consumed.
Show all
130W
Average value: 160 W
2W
Technological process
The small size of the semiconductor means it is a new generation chip.
28 nm
Average: 34.7 nm
4 nm
Number of transistors
2800 million
max 80000
Average: 7150 million
80000 million
PCIe version
Considerable speed is provided for an expansion card used to connect a computer to peripherals. The updated versions have impressive throughput and provide high performance.
Show all
3
Average: 3
5
Width
198mm
max 421.7
Average: 192.1mm
421.7 mm
Height
120mm
max 619
Average: 89.6mm
619 mm
DirectX
Used in demanding games, providing enhanced graphics
11.1
max 12.2
Mean: 11.4
12.2
OpenCL version
Used by some applications to enable GPU power for non-graphical calculations. The newer the version, the more functional it will be
Show all
1.2
max 4.6
Average: 2.2
4.6
opengl version
Later versions provide better game graphics
4.2
max 4.6
Average: 4.2
4.6
Supports FreeSync technology
Yes
Shader model version
5.1
max 6.6
Average: 5.9
6.6
Vulkan version
Yes
Has HDMI output
HDMI output allows you to connect devices with HDMI or mini-HDMI ports. They can transmit video and audio to the display.
Show all
Yes
DVI outputs
Allows connection to a display using DVI
1
Mean: 1.4
3
mini-DisplayPort
Allows you to connect to a display using a mini-DisplayPort
2
Mean: 2.1
6
Interface
PCIe 3.0 x16
HDMI
Yes
Passmark test score
3694
max 29325
Average: 7628.6
29325
3DMark Fire Strike Graphics test score
5106
max 49575
Average: 11859. 1
49575
Unigine Heaven 4.0 test score
621
max 4818
Average: 1291.1
4818
FAQ
How much RAM does the XFX Radeon HD 7850 2GB have
The XFX Radeon HD 7850 2GB has 2 GB.
What version of RAM does the XFX Radeon HD 7850 2GB
XFX Radeon HD 7850 2GB support GDDR5.
What is the architecture of the XFX Radeon HD 7850 2GB 9 graphics card0513
GCN 1.0.
Does the XFX Radeon HD 7850 2GB Freesync
Yes.
How many watts does the XFX Radeon HD 7850 2GB consume?
130 watts.
How the XFX Radeon HD 7850 2GB performs in the benchmarks
The card scored 3694 points in the Passmark benchmark.
XFX Radeon HD 7850 2GB FLOPS
1.72 TFLOPs.
What version of PCIe does it support?
PCIe version 3.
Which version of DirectX does the XFX Radeon HD 7850 2GB 9 support?0513
DirectX 11. 1.
Does the XFX Radeon HD 7850 2GB DVI support
1 DVI ports.
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XFX Radeon HD 7850 2GB
39points
XFX Radeon HD 7850 2GB
XFX Radeon HD 7850 2GB
Why XFX Radeon HD 7850 2GB is better than others?
- Design requirements for heat dissipation (TDP)?
130W vs 199. 53W - GPU temperature at boot?
60°C vs 73.04°C - Power consumption at peak load?
271W vs 323.6W - Monitor support?
6 vs 3.96 - DVI outputs?
1 vs 0.73 - Width?
198mm vs 260.39mm - Mini DisplayPort outputs?
2 vs 0.01
Which comparisons are the most popular?
XFX Radeon HD 7850 2GB
vs
Nvidia GeForce GTX 460
XFX Radeon HD 7850 2GB
vs
AMD Radeon R7 260X
XFX Radeon HD 7850 2GB
vs
Nvidia GeForce GTX 1050
XFX Radeon HD 7850 2GB
vs
AMD Radeon R7 360
XFX Radeon HD 7850 2GB
vs
Nvidia GeForce GTX 750
XFX Radeon HD 7850 2GB
vs
MSI GeForce GTX 1070 Ti Armor
XFX Radeon HD 7850 2GB
vs
Nvidia GeForce GTX 480
XFX Radeon HD 7850 2GB
When the GPU is running below its limits, it may jump to a higher clock speed to increase performance.
pixel rate
27.5 GPixel/s
The number of pixels that can be displayed on the screen every second.
FLOPS
1.76 TFLOPS
FLOPS is a measure of GPU processing power.
texture size
55 GTexels/s
The number of textured pixels that can be displayed on the screen every second.
GPU memory speed
1200MHz
Memory speed is one aspect that determines memory bandwidth.
Shading patterns
Shading units (or stream processors) are small processors in a graphics card that are responsible for processing various aspects of an image.
texture units (TMUs)
TMUs take texture units and map them to the geometric layout of the 3D scene. More TMUs generally means texture information is processed faster.
ROPs
ROPs are responsible for some of the final steps of the rendering process, such as writing the final pixel data to memory and for performing other tasks such as anti-aliasing to improve the appearance of graphics.
Memory
effective memory speed
4800MHz
The effective memory clock is calculated from the size and data transfer rate of the memory. A higher clock speed can give better performance in games and other applications.
maximum memory bandwidth
154GB/s
This is the maximum rate at which data can be read from or stored in memory.
VRAM (video RAM) is the dedicated memory of the graphics card. More VRAM usually allows you to run games at higher settings, especially for things like texture resolution.
memory bus width
256bit
A wider memory bus means it can carry more data per cycle. This is an important factor in memory performance, and therefore the overall performance of the graphics card.
GDDR versions of
Later versions of GDDR memory offer improvements such as higher data transfer rates, which improves performance.
Supports memory troubleshooting code
✖XFX Radeon HD 7850 2GB
Memory troubleshooting code can detect and repair data corruption. It is used when necessary to avoid distortion, such as in scientific computing or when starting a server.
Functions
DirectX version
DirectX is used in games with a new version that supports better graphics.
OpenGL version
The newer the OpenGL version, the better graphics quality in games.
OpenCL version
Some applications use OpenCL to use the power of the graphics processing unit (GPU) for non-graphical computing. Newer versions are more functional and better quality.
Supports multi-monitor technology
✔XFX Radeon HD 7850 2GB
The graphics card has the ability to connect multiple screens. This allows you to set up multiple monitors at the same time to create a more immersive gaming experience, such as a wider field of view.
GPU boot temperature
Lower boot temperature means the card generates less heat and the cooling system works better.
supports ray tracing
✖XFX Radeon HD 7850 2GB
Ray tracing is an advanced light rendering technique that provides more realistic lighting, shadows and reflections in games.
Supports 3D
✔XFX Radeon HD 7850 2GB
Allows you to view in 3D (if you have a 3D screen and glasses).
supports DLSS
✖XFX Radeon HD 7850 2GB
DLSS (Deep Learning Super Sampling) is an AI based scaling technology. This allows the graphics card to render games at lower resolutions and upscale them to higher resolutions with near-native visual quality and improved performance. DLSS is only available in some games.
PassMark result (G3D)
This test measures the graphics performance of a graphics card. Source: Pass Mark.
Ports
has HDMI output
✔XFX Radeon HD 7850 2GB
Devices with HDMI or mini HDMI ports can stream HD video and audio to an attached display.
HDMI connectors
More HDMI connectors allow you to connect multiple devices at the same time, such as game consoles and TVs.
HDMI version
HDMI 1.4
New HDMI versions support higher bandwidth, resulting in higher resolutions and frame rates.
DisplayPort outputs
Allows connection to a display using DisplayPort.