I5 8700 vs i5 8400: Intel Core i5-8400 vs Intel Core i7-8700 vs Intel Core i7-8700K

Intel Core i5-8400K Processor Key Features

• Intel Turbo Boost Technology 2.0: Dynamically increases the processor frequency up to 4.0GHz when applications demand more performance. Speed when you need it, energy efficiency when you dont.
• Intel Smart Cache: 9MB of shared cached allows faster access to your data by enabling dynamic and efficient allocation of the cache to match the needs of each core significantly reducing latency to frequently used data and improving performance.
• Integrated Memory Controller: Supports 2 channels of DDR4-2666 memory with 2 DIMMs per channel.
• PCI Express 3.0 Interface: Supports up to 8 GT/s for fast access to peripheral devices and networking with up to 16 lanes configurable as 1×16, 2×8, or 1×8 and 2×4 depending on the motherboard design.
• Chipset/Motherboard Compatibility: Compatible with all Intel 300 Series chipsets with the latest BIOS and drivers.
• Intel UHD Graphics 630: Integrated 3D performance with support for Microsoft DirectX 12 and Ultra HD 4K resolution display for immersive mainstream gaming. For Microsoft DirectX 12 testing, the performance-tuned Intel graphics driver is expected to be available for download on Intel Download Center by the 8th generation Intel Core processor family product introduction. The Intel UHD Graphics 630 dynamic graphics frequency ranges up to 1105MHz.
  • Vibrant Media: Enhanced, built-in visual features deliver a seamless visual PC experience for rich Ultra HD 4K entertainment and HD gaming.
  • Intel Quick Sync Video Technology: Media processing for incredibly fast conversion of video files for portable media players or online sharing including support for HEVC 10-bit (H.265) encode/decode to playback premium 4K Ultra HD content from selected service providers.

Let’s move onto the benchmarks after looking at the test systems on the next page.

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Intel Core i7-8700K and Core i5-8400 benchmarks

Oct 6,2017

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1. Meet the Intel Core i7-8700K and Core i5-8400 CPUs

Review Pages

1. Meet the Intel Core i7-8700K and Core i5-8400 CPUs
2. Encoding — Cinebench R15, Handbrake, TMPG Video Mastering Works 6
3. PCMark 10, Sandra Platinum
4. 3D Mark Time Spy, Fire Strike Ultra and Fire Strike
5. VRMark Orange Room, Blue Room
6. Gaming — Ashes of the Singularity: Escalation, Overwatch, The Witcher 3
7. Gaming — Ghost Recon Wildlands, Watch Dogs 2
8. Power consumption, CPU temperature
9. Final words

We were looking forward for Intel’s first six-core parts for the
mainstream PC market. But now the company is finally launching the Intel’s new 8th Generation Coffee Lake CPUs, with the Core i5 and Core i7 parts having six distinct physical cores. Today we are running some benchmarks with the top SKU, the Core i7-8700K, along with looking at numbers from the Core i5-8400, comparing them with the Core i7-7700K and the AMD Ryzen 7 1700 parts.

Intal is actually releasing six desktop processors that all fall under the ‘8th Generation’ nomenclature, and are built under the codename ‘Coffee Lake’ to designate the microarchitecture and manufacturing process combination.

All these new processors require appropriate motherboards featuring the Z370 chipset. Technically these processors use the LGA1151 socket, which is also used by the 6th Generation and 7th Generation processors with the Z170 and Z270 chipsets. However due to differences in the pin-layout of these two sets of processors, 8th Gen will only work in Z370 boards and there is no level of cross compatibility.

Intel 8th Generation ‘Coffee Lake’ Desktop Processors
	i7-8700K	i7-8700	i5-8600K	i5-8400	i3-8350K	i3-8100
Cores	6C / 12T		6C / 6T		4C / 4T
Base Frequency	3. 7 GHz	3.2 GHz	3.6 GHz	2.8 GHz	4.0 GHz	3.6 GHz
Turbo Boost 2.0	4.7 GHz	4.6 GHz	4.3 GHz	4.0 GHz	—	—
L3 Cache	12 MB		9 MB		8 MB	6 MB
DRAM Support	DDR4-2666				DDR4-2400
Integrated Graphics	Intel UHD Graphics 630 GT2: 24 EUs			Intel UHD Graphics 630 GT2: 23 EUs
IGP Base Freq	350 MHz			350 MHz
IGP Turbo	1. 20 GHz		1.15 GHz	1.05 GHz	1.15 GHz	1.10 GHz
PCIe Lanes (CPU)	16			16
PCIe Lanes (Z370)	< 24			< 24
TDP	95 W	65 W	95 W	65 W	91 W	65 W
Price (tray)	$359	$303	$257	$182	$168	$117

The Core i7-8700K starts at a 3.7 GHz base frequency and is designed to turbo to 4.7 GHz in single threaded workloads, with a thermal design power (TDP) of 95W. The K designation means this processor is unlocked and can be overclocked by adjusting the frequency multiplier, subject to appropriate cooling, applied voltage, and the quality of the chip (Intel guarantees 4. 7 GHz). The Core i7-8700 is the non-K variant, with lower clocks (3.2 GHz base, 4.6 GHz turbo) and a lower TDP (65W). Both of these processors use 256 KB of L2 cache per core and 2 MB of L3 cache per core.

Intel’s newest ’14++’ manufacturing process is being used for these 8th Generation processors. Intel has decided that it will use multiple process nodes and microarchitectures across a single generation of products. A lot of this is down to product maturity, yields, and progress on the manufacturing side.

With a new processor generation comes an update to memory support.
Intel is supporting DDR4-2666 for the six-core parts and DDR4-2400 for the quad-core parts, in both 1DPC (one DIMM per channel) and 2DPC modes.

Intel has made it clear that Coffee Lake processors will work only in Z370 motherboards, and not in the previous generation Z270 motherboards.

All the six processors being made available today will have Intel’s UHD Graphics 630. This is basically identical to the previous generation’s HD Graphics 630, except the name is now UHD. The other change is HDCP2.2 support.

Intel claims that there are performance improvements with the new graphics package, mainly from an updated driver stack but also increased frequencies. All the parts will have an idle frequency of 350 MHz, and boost up to the following frequencies:

	i7-8700K	i7-8700	i5-8600K	i5-8400	i3-8350K	i3-8100
Integrated Graphics	GT2: 24 EUs			GT2: 23 EUs
IGP Base Freq	350 MHz			350 MHz
IGP Turbo	1. 20 GHz	1.20 GHz	1.15 GHz	1.05 GHz	1.15 GHz	1.10 GHz

The Z370 chipset is identical to the Z270 chipset. The connectivity is the same, the number of supported PCIe 3.0 lanes is the same, the available bifurcation is the same, the controller support is the same. The chipset has 20-24 PCIe 3.0 lanes, six SATA 6 Gbps ports with support for RAID 0/1/5/10, a total of 14 USB ports (either 2.0 or 3.0, up to a maximum of ten of USB 3.0), and supports network controllers, Thunderbolt 3, and Intel’s Optane memory as a boot drive.

Looking at the prices and the compatition, the Core i7-8700K ($359) sits almost equally between the Ryzen 7 1700X ($399) and Ryzen 7 1700 ($329). Here this would be a battle of sixteen Zen threads compared to 12 Coffee Lake threads, with the IPC and frequency advantage on Intel’s side. It will be interesting to see where the Core i7-8700 ($303) sits in performance per dollar compared to the Ryzen 7 1700.

The Core i5-8600K ($257) costs almost the same as the Ryzen 5 1600X ($248). With Intel moving the Core i5 parts to having six full cores, albeit without hyperthreading but with a high frequency, it is going to be an interesting battle between the two at this price.

The Core i5-8400 ($182) and Core i3-8350K ($169) sit near the Ryzen 5 1500X ($189) and the Ryzen 5 1400 ($169) respectively.

For this review today, we are focusing on our preliminary testing of the Core i7-8700K and the Core i5-8400:

Here is out testbed:

CPU	Core i7-8700K	Core i5-8400	Core i7-7700K	Ryzen 7 1700
Motherboard	ASUS PRIME Z370-A (UEFI: 0408)		ASUS PRIME Z270-A (UEFI: 1009)	ASUS PRIME X370-PRO (UEFI: 0902)
Memory	16GB x 2 DDR4-2666 (2Ch, 19-19-19-43,1. 20V)		16GB x 2 DDR4-2400 (2Ch, 17-17-17-39,1.20V)	16GB x 2 DDR4-2666 (2Ch, 19-19-19-43,1.20V)
GPU	GeForce GTX 1080 8GB (Founders Edition)
Power supply	KRPW-TI700W / 94 + (700W 80PLUS Titanium)
CPU Cooler	Scythe Fuma SCFM—1000
Graphics driver	GeForce Hotfix Driver version 385.69
OS	Windows 10 Pro 64bit

Review Pages

1. Meet the Intel Core i7-8700K and Core i5-8400 CPUs
2. Encoding — Cinebench R15, Handbrake, TMPG Video Mastering Works 6
3. PCMark 10, Sandra Platinum
4. 3D Mark Time Spy, Fire Strike Ultra and Fire Strike
5. VRMark Orange Room, Blue Room
6. Gaming — Ashes of the Singularity: Escalation, Overwatch, The Witcher 3
7. Gaming — Ghost Recon Wildlands, Watch Dogs 2
8. Power consumption, CPU temperature
9. Final words

Pages

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Intel Core i5-8400 vs. Intel Core i7-8700

Intel Core i5-8400

Intel Core i5-8400 runs with 6 and 6 CPU threads It runs at 4.00 GHz base 3.80 GHz all cores while TDP is set to 65 W . CPU socket LGA 1151-2 This version includes 9.00 MB of L3 cache on a single die, supports 2 to support DDR4-2666 RAM, and supports 3.0 PCIe Gen 16 . Tjunction is kept below — degrees C. In particular, the Coffee Lake S architecture has been advanced over 14 nm and supports VT-x, VT-x EPT, VT-d . The product was launched Q4/2017

Intel Core i7-8700

Intel Core i7-8700 runs with 6 and 6 CPU threads It runs at 4. 60 GHz base 4.30 GHz all cores while the TDP is set to 65 W .The processor connects to the CPU socket LGA 1151- 2 This version includes 12.00 MB of L3 cache on a single die, supports 2 to support DDR4-2666 RAM, and supports 3.0 PCIe Gen 16 . Tjunction is kept below 100°C degrees C. In particular, Coffee Lake S architecture is advanced beyond 14 nm and supports VT-x, VT-x EPT, VT-d . The product was launched Q4/2017

Intel Core i5-8400

Intel Core i7-8700

Intel UHD Graphics 630

Intel UHD Graphics 630

Show more details

Show more details

Cinebench R23 (Single-Core)

Cinebench R23 is the successor to Cinebench R20 and is also based on the Cinema 4 Suite. Cinema 4 is software used all over the world to create 3D forms. The single-core test uses only one CPU core, the number of cores or hyper-threading capability is not taken into account.

Cinebench R23 (Multi-Core)

Cinebench R23 is the successor to Cinebench R20 and is also based on the Cinema 4 Suite. Cinema 4 is software used all over the world to create 3D forms. The multi-core test uses all the CPU cores and gives a big advantage of hyper-threading.

Cinebench R20 (Single-Core)

Cinebench R20 is the successor to Cinebench R15 and is also based on the Cinema 4 Suite. Cinema 4 is software used all over the world to create 3D forms. The single-core test uses only one CPU core, the number of cores or hyper-threading capability is not taken into account.

Cinebench R20 (Multi-Core)

Cinebench R20 is the successor to Cinebench R15 and is also based on the Cinema 4 Suite. Cinema 4 is software used all over the world to create 3D forms. The multi-core test uses all the CPU cores and gives a big advantage of hyper-threading.

Cinebench R15 (Single-Core)

Cinebench R15 is the successor to Cinebench 11.5 and is also based on Cinema 4 Suite. Cinema 4 is software used all over the world to create 3D forms. The single-core test uses only one CPU core, the number of cores or hyper-threading capability is not taken into account.

Cinebench R15 (Multi-Core)

Cinebench R15 is the successor to Cinebench 11.5 and is also based on the Cinema 4 Suite. Cinema 4 is software used all over the world to create 3D forms. The multi-core test uses all the CPU cores and gives a big advantage of hyper-threading.

Geekbench 5, 64bit (Single-Core)

Geekbench 5 is a memory-intensive, cross-platform test. A fast memory will greatly push the result. The single-core test uses only one CPU core, the number of cores or hyper-threading capability is not taken into account.

Geekbench 5, 64bit (Multi-Core)

Geekbench 5 is a memory-intensive, cross-platform benchmark. A fast memory will greatly push the result. The multi-core test uses all the CPU cores and gives a big advantage of hyper-threading.

iGPU — FP32 Performance (Single-precision GFLOPS)

Theoretical processing performance of the processor’s internal graphics unit with simple precision (32 bits) in GFLOPS. GFLOPS specifies how many billions of floating point operations the iGPU can perform per second.

Blender 2.81 (bmw27)

Blender is a free 3D graphics software for rendering (creating) 3D bodies that can also be textured and animated in the program. The Blender test creates predefined scenes and measures the time(s) required for the entire scene. The less time it takes, the better. We chose the bmw27 as our reference scene.

Geekbench 3, 64bit (Single-Core)

Geekbench 3 is a cross-platform benchmark that is memory intensive. A fast memory will greatly push the result. The single-core test uses only one CPU core, the number of cores or hyper-threading capability is not taken into account.

Geekbench 3, 64bit (Multi-Core)

Geekbench 3 is a cross-platform benchmark that is memory intensive. A fast memory will greatly push the result. The multi-core test uses all the CPU cores and gives a big advantage of hyper-threading.

Cinebench R11.5, 64bit (Single-Core)

Cinebench 11.5 is based on Cinema 4D Suite, a software that is popular for creating shapes and other 3D. The single-core test uses only one CPU core, the number of cores or hyper-threading capability is not taken into account.

Cinebench R11.5, 64bit (Multi-Core)

Cinebench 11.5 is based on Cinema 4D Suite, a software that is popular for creating shapes and other things in 3D. The multi-core test uses all the CPU cores and gives a big advantage of hyper-threading.

Cinebench R11.5, 64bit (iGPU, OpenGL)

Cinebench 11.5 is based on the Cinema 4D Suite, a software that is popular for creating shapes and other things in 3D. The iGPU test uses the CPU’s internal graphics unit to execute OpenGL commands.

Estimated results for PassMark CPU Mark

Some of the processors listed below have been tested with CPU-Comparison. However, most of the processors were not tested and the results were evaluated by the secret patented CPU-Comparison formula. As such, they do not accurately reflect the actual values ​​of Passmark CPU ratings and are not endorsed by PassMark Software Pty Ltd.

Energy usage estimate

Average hours of use per day

Average CPU usage (0-100%)

Cost of electricity, USD/kWh

Energy usage estimate

Average hours of use per day

Average CPU usage (0-100%)

Cost of electricity, USD/kWh

Popular comparison0001

November 8, 2021, Monday
20:21

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Blogs

This material was written by a site visitor and has been rewarded.

In the last article on the i7-8700T processor, I reviewed a sufficient number of games where the performance differed from the previously installed i5-8400 processor, categorically little (paired with the GTX 1070). But then I pointed out that all the difference in performance is visible directly in the games themselves, where 12 threads provide greater smoothness and comfort of the gameplay.

Many in the comments strongly doubted this fact. And now, having freed myself a little, I decided to dwell on this aspect in more detail.

The benchmarks themselves do not always give an objective picture of the balance of your system in the game itself. Often they create a deceptive situation when it seems to you after viewing the benchmark result that there will be no performance problems in the game. In fact, things can turn out much worse. For example, the built-in benchmark Gears 5 is very loyal to the processor. And for a good result in the benchmark, some i5-3570 will be enough. But in the game itself there are quite a few processor-dependent moments that will let you know that 4 threads are extremely small.

recommendations

For my example, I chose only two games: Horizon Zero Dawn and Shadow of the Tomb Raider , which are very CPU-intensive. And, although in benchmarks, the difference between the i5-8400 and i7-8700T is minimal, in reality this is far from the case.

Testing will take place exclusively on game settings, i.e. the video card will always and everywhere provide a minimum of 60 frames. Recording of test runs will be done by CapFrameX program which is very informative.

Test system :

CPU i7-8700T/i5-8400 (operating frequencies 3800-3900 MHz)

Board: AsRock B360 Fatality Gaming K4

Video card: EVGA GTX 1070 FTW

Operating system: Windows 10 LTSC.

The first game to be tested will be Horizon Zero Dawn .

Game settings:

Anisotropic filtering is forced to x16 in the NVidia control panel and the image sharpness is set.

The test run will take place at a rather difficult location — Meridian.

Here is a video of the test run (the quality is not so hot (recording on the phone), but the Internet imposes strong restrictions due to speed):

Now let’s look at the test result: difference. But according to rare and very rare events, it is simply huge. Namely, these two values ​​\u200b\u200band show how smoothly, without friezes, the gameplay is going on. And here the advantage of 12 threads is undeniable.

Next, a more detailed graph of the mileage data:

8400.

8700T

And such an advantage in the game is observed quite often, especially in large settlements.

Now consider Shadow of the Tomb Raider .

The game also loads the processor quite heavily in places. As a test location, I chose the settlement of Kuvak-Yaku:

Game settings:

Sharpness is enabled in the NVidia control panel.

Mileage result:

8400.

8700T.

Here the difference in rare events is very insignificant. But for very rare events, 0.1% percentile is quite noticeable. But this is most likely a one-time «stuttering».

In addition to the test run, let’s take a closer look at the result in the benchmark.

I took the results of the benchmark itself from the previous article:

8400, maximum graphics settings, TAA anti-aliasing.

8700T.

As you can see, only 1 fps advantage… There is a lot of different data here. And this is far from true. To begin with, let’s remember that the benchmark itself is divided into three segments, where the first one loads both the video card and the processor approximately equally, the second one — exerts a load mainly on the video card. And only the third segment, at the moment of lowering the camera to the marketplace, begins to intensively load the processor.

And what does the benchmark result show us in the CPU column Game? We see the i5-8400 leading the way!

What’s more, see for yourself:

i5-4690K.

Even 4690K turns out to be faster than 8700. Which smacks of obvious nonsense. Many will say that you need to navigate according to the readings of the Render CPU. And in some ways they will be right, but this indicator rather shows the potential of the processor, and not of our entire system.

Therefore, it is worth measuring the performance separately in the third segment of the benchmark (game settings).

The recording was made from the moment of the first tower until the appearance of Lara Croft in the center of the screen:

And here again we see that the 8700T leaves no chance of 8400 FPS rare and very rare events. So, in difficult locations, smoothness with 8700T will be of a completely different level.

This is a very important note, which justifies the purchase of 8700, albeit somewhat cut in frequencies.

In general, not all reviewers and bloggers pay attention to the values ​​of 1% and 0.1%. After all, given these characteristics, much will look a little different.

This content was written by a website visitor and has been rewarded.