AMD Radeon R9 285 Review — Tom’s Hardware
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On paper, the new Tonga-based R9 285 looks to be slightly slower than the R9 280 it is intended to replace, but there’s more than meets the eye.
Early Verdict
A good $250 replacement for the Radeon R9 280 that doesn’t up the ante when it comes to game performance, but adds new features and lower power usage to the mix.
Pros
- +
Performance on par with Radeon R9 280. New features including TrueAudio and bridgeless CrossFire. Lower power usage and improved performance-per-watt.
Cons
- —
Lower raw memory bandwidth than Radeon R9 280 that may result in slightly lower performance in some cases. 2 GB of onboard RAM instead of 3 GB. Does not notably increase performance over Radeon R9 280 on average.
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The Radeon’s GCN Is Updated Again: The Tonga GPU
When we first heard about the new Radeon R9 285, our first impression was pessimistic. The new Tonga GPU sports specifications that are nearly identical compared to the Radeon R9 280, but with a slightly lower GPU clock and a sizable memory bandwidth deficit thanks to its thinner 256-bit memory interface. While the Radeon R9 285’s onboard RAM runs at a higher 1375 MHz clock, the net result is 176 GB/s of memory bandwidth — significantly less than the 240 GB/s memory bandwidth of the R9 280.
In addition, the R9 285 has 2 GB of RAM, whereas the R9 280 has 3 GB.
AMD Radeon R9 280
AMD Radeon R9 285
AMD Radeon R9 280X
The tale of the tape is not kind to the Radeon R9 285. Yes, the new card’s power usage has gone down significantly compared to its predecessor, but from a gaming perspective, that would be small consolation in exchange for lower performance. If raw specifications were all that mattered, and if the Tonga graphics processor was merely a re-spin of the Tahiti GPU in the Radeon R9 280, we wouldn’t have a lot of nice things to say about the new Radeon R9 285.
After testing it, though, we were pleasantly surprised to find that the Radeon R9 285 has a few tricks up its sleeve thanks to some re-engineering of the Graphics Core Next (GCN) architecture.
Despite what its specifications may suggest, Tonga is not a spin on the Tahiti GPU in the Radeon R9 280 and 280X. Rather, it is a new and condensed version of the Hawaii GPU in the Radeon R9 290 and 290X. Among other things this means it has four times the number of asynchronous compute engines, that’s eight instead of the Radeon R9 280/280X’s two. According to AMD this can improve tessellation performance from two to four times, and facilitates effects that rely on GPU compute. In addition, the Radeon R9 285 inherits the 290 series’ quad-shader layout, allowing four primitives to be rendered per clock cycle instead of two. Also note the CrossFire XDMA block, which provides the possibility of multi-card operation without a bridge connector.
Tonga features four shader engines, each carrying seven compute units (CUs). Just like previous GCN-based GPUs, every CU is host to 64 shaders and four texture units, adding up to a total of 1792 shaders and 112 texture units in the Radeon R9 285.
These numbers are equal to the cut-down Tahiti chip in the Radeon R9 280, but the arrangement of resources is different.
Speaking of cut-down, we’re told that Tonga is slightly handicapped for use in the 285, and that the uncut GPU has the potential to utilize eight compute units per shader engine for a total of 2048 shaders and 128 Texture units. If this sounds familiar, it’s because this is the same number of resources available in the Radeon R9 280X. Perhaps AMD has some bigger plans for the Tonga GPU in the future.
Regardless, AMD did scale back some parts of the new GPU. Each of the four shader engines carries two render back-ends — instead of four as per the Radeon R9 290 series. Each of these is capable of rendering four full-color pixels per clock, for a total of 32 pixels per clock cycle in total. This is half of what Hawaii can process but equals the Tahiti GPU in the Radeon 280 and 280X.
Improvements are always welcome but with the memory interface cut by a third compared to the Radeon R9 280, AMD needed to accomplish some magic to compensate for that 27% drop in available bandwidth.
The company’s solution was to enable the GPU to read and write frame buffer color data in a lossless compressed format, a technique that it claims can deliver 40% higher memory bandwidth efficiency. We’re somewhat skeptical that this will completely compensate for the Radeon R9 285’s lower available bandwidth compared to the Radeon R9 280, but we’ll see what the benchmarks have to say about it.
That’s not all that’s been improved over the Hawaii GPU in the Radeon 290 series, though. Tonga boasts other new features such as the ability to process instructions in parallel between SIMD lanes, improved compute task scheduling algorithms, and even new 16-bit floating point and integer instructions for compute and media processing tasks.
Of course, Tonga has inherited Hawaii’s fixed-function hardware, too, such as TrueAudio (AMD’s new audio processor) and project FreeSync (the open-source answer to Nvidia’s G-Sync) support. In addition, AMD claims to have revamped the unified video decoder (UVD) and video coding engine (VCE) with improvements specific to the Tonga GPU.
The Radeon R9 285’s UVD now supports H.264 playback at high frame rates on 4K displays, and the VCE has been improved with faster performance in addition to 4K resolution support. AMD claims a 31%-47% transcoding advantage over the GeForce GTX 760, but we’d prefer to run our own tests on that so expect some in-depth coverage from us in the future.
For the first time, AMD has added the ability to specify the maximum fan speed in the Overdrive overclocking utility. This means that users who prioritize noise can set the maximum fan RPMs, and the driver will automatically adjust clock rates to fit power and heat into the user-specified envelope. This feature will be available in the 14.8 release driver, but only to models with second- and third-iterations of GCN processors: the Radeon R7 260, 260X, R9 285, R9 290, and R9 290X. This functionality didn’t seem to work in our pre-release beta driver, unfortunately.
Those are the updated details we have to share from an architectural perspective, now let’s get down to the nitty gritty: the test hardware, specifically the Radeon R9 285 card.
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Review of the video card HIS R9 285 IceQ X2 OC and updated testing Radeon R9 285
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Radeon R9 285 by Gigabyte. Review and testing of the video card GV-R9285WF2OC-2GD
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I wish there were more memory! GECID.com. Page 1
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> Gameplay testing of Radeon R9 285 and comparison with GTX 1050 Ti: I wish there was more memory!
03-02-2020
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Of course, you remember very well, and we will refresh our memory for ourselves, that the Radeon R9 285 video card appeared in September 2014 with a recommended price tag of $249. It is based on the 28nm Tonga PRO GPU with the third generation GCN microarchitecture. It has 1792 stream processors, 112 texture units and 32 raster units.
The GPU configuration is exactly the same as the Tahiti PRO, which formed the basis of the Radeon HD 7950 and R9 280. At the same time, Tahiti PRO uses an older microarchitecture, but is paired with 3 instead of 2 GB video memory.
In 2014, this was not so critical, but now it makes itself felt, as you will see for yourself in a few minutes. AMD even planned to release an R9 version285X with a Tonga XT chip and 3 GB of memory, but something didn’t work out.
The guinea pig in our test was the MSI R9 285 GAMING video card. She received three profiles of the GPU. We chose the fastest one with a frequency of 973 MHz. This is 6% higher than the benchmark. But 2 GB of GDDR5 memory runs at a reference effective speed of 5500 MHz with a 256-bit bus.
The proprietary Twin Frozr IV Advanced cooler is responsible for cooling the internal components. Its passive part is represented by four heat pipes, a main aluminum radiator and an additional low-profile one for memory chips and a VRM unit. The active part is based on two 95mm fans with double ball bearings.
In games, the temperature of the GPU reached 83°C. AMD did not report a critical temperature, but the video card’s BIOS has a value of 100 ° C.
First of all, we decided to find a real competitor for the R9 285. It turned out to be a GeForce GTX 1050 Ti video card. We had a version from Colorful with a 2-fan cooler and a factory overclocked GPU at hand. It is activated not in a proprietary utility, but using a button on the interface panel.
The GTX 1050 Ti itself appeared in the fall of 2016. Its recommended price tag is 44% lower and TDP is 61% lower. At the same time, it has 4 GB of video memory with a faster effective frequency.
This allowed the 1050 Ti to confidently overtake the «red» opponent in all respects in DirectX 11 using the example of Far Cry New Dawn .
The transition to DirectX 12 in Strange Brigade completely changes the balance of power — now R9 285 leaves no chance for the opponent.
In Shadow of the Tomb Raider , R9 285 is only better at very rare events.
A World War Z failed to determine the winner: AMD’s representative is slightly better in average speed, while NVIDIA wins in the rest of the statistics.
Overall, the R9 285 was 3-7% faster than the 4GB GTX 1050 Ti. Therefore, if you plan to upgrade, then look towards at least the RX 570, GTX 1066 or GTX 1650 SUPER.
Now let’s imagine the test bench. To match the video card, they took a far from new 8-thread processor Core i7-7740X in nominal value. This is an analogue of the i7-7700K, only for the Core X series and without an integrated video core.
Watched over by the tower cooler be quiet! DARK ROCK PRO 4 . In addition to the massive passive part, it includes two Silent Wings fans 120 and 135 mm. The maximum level of their noise reaches 24 dB.
The motherboard will be «modest and inconspicuous» — ASUS TUF X299 MARK 1 ATX format.
The RAM subsystem is represented by four conventional DDR4-2400 sticks from Apacer .
Most of the games and operating system are installed on a pair of Apacer SSDs.
For the rest, there is a hybrid drive from Seagate .
We did not measure the power consumption of the system from the socket, but the total TDP of the processor and video card exceeds 300 W. Therefore, we took a reliable «gold» source Super Flower Leadex III Gold 650W . Its single 12-volt channel can deliver 649 watts when needed. This is more than enough for the stable operation of our system.
All components felt great inside the be quiet! Silent Base 801 . For lovers of capacious file storage, it offers five bays for 3.5-inch HDDs, which can be used for eight 2.5-inch ones. Separately, there are three seats for 2.5-inch drives.
The Redragon brand helped us with peripherals. We are happy to share our live impressions of his products.
The Redragon Indrah mechanical keyboard received Outemu Blue clicky switches. This is one of the cheapest Chinese Cherry MX clones, but they are slightly tighter and louder when pressed.
In the mouse Redragon Cobra I liked the textural highlighting of the side key in front. In general, the buttons are comfortable to press, with an average click volume. Beneath the main ones are reliable Omron switches.
The mouse glided easily and quickly on the mat Redragon Archelon .
But the headphones Redragon Lagopasmutus left an ambivalent impression. They look like an amateur and the materials of construction are controversial, especially the easily scratched gloss. However, they sound acceptable.
Gameplay recorded by external system with AVerMedia Live Gamer 4K. More details in the description.
Main test start from Dota 2 . At maximum settings, it requires less than 2 GB of video memory, and takes another 5 GB from the RAM. Gameplay feels fluid and comfortable, even when multiple heroes are clashing. In the process, the statistics of very rare events fell below 30 fps, but without critical consequences.