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CPU Comparison: FPS, Specs & Value

Core i5-8400 vs Core i7-8700K

The Core i5-8400 is slightly slower than the Core i7-8700K on average across 100+ games and it's also a slightly worse value for money, as it's only $0.05 cheaper!

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CPU

$198.95View CPUAll CPUs

Up to 97% cheaper – $198.95 vs $199.00
Up to 75% better value for money

CPU

$199.00View CPUAll CPUs

Up to 12% faster on average across 100+ games
Up to 97% more expensive – $199.00 vs $198.95

FPS Comparison Across Popular Games

Predicted average FPS at 1080p, 1440p, and 4K, based on real game benchmarks.

Resolution

Quality

Paired GPU

View Compare All GPUs

Select GPU

Elden Ring2022

Core i5-8400

152FPS

Core i7-8700K

155FPS

Escape From Tarkov2017

Core i5-8400

220FPS

Core i7-8700K

225FPS

Dota 22013

Core i5-8400

190FPS

Core i7-8700K

200FPS

League of Legends2009

Core i5-8400

217FPS

Core i7-8700K

242FPS

Grand Theft Auto V2013

Core i5-8400

204FPS

Core i7-8700K

208FPS

Fortnite2017

Core i5-8400

327FPS

Core i7-8700K

329FPS

Valorant2020

Core i5-8400

592FPS

Core i7-8700K

613FPS

Overwatch 22023

Core i5-8400

520FPS

Core i7-8700K

525FPS

Specs & Benchmark Comparison

Side-by-side specs, synthetic benchmarks, and key hardware differences.

Scorehelp

Core i5-8400

28%

Core i7-8700K

34%

Core i7-8700K ranks 6 points higher.

Coreshelp

Threadshelp

Core i7-8700K has 6 more threads.

L3 Cachehelp

Core i5-8400

9 MB

Core i7-8700K

12 MB

Core i7-8700K has 3 MB more L3 cache.

Base Frequencyhelp

Core i5-8400

2.8 GHz

Core i7-8700K

3.7 GHz

Core i7-8700K has a 32% higher base clock.

Turbo Frequencyhelp

Core i5-8400

4 GHz

Core i7-8700K

4.7 GHz

Core i7-8700K boosts 18% higher.

TDPhelp

Core i5-8400

65W

Core i7-8700K

95W

Core i5-8400 draws 30W less power.

Pricehelp

Core i5-8400

$198.95

Core i7-8700K

$199.00

Core i5-8400 is $0.05 cheaper.

Core i5-8400Core i7-8700K

LGA1151

Sockethelp

LGA1151

Coffee Lake

Codenamehelp

Coffee Lake

Desktop

Segmenthelp

Desktop

UHD Graphics 630

Integrated GPUhelp

UHD Graphics 630

2666 MHz (DDR4)

RAMhelp

2666 MHz (DDR4)

Not Overclockable

Overclock Supporthelp

Overclockable

Frequently Asked Questions

compare_arrowsWhich is better, Core i5-8400 or Core i7-8700K?expand_more

The Core i7-8700K. It's 21% faster than the Core i5-8400 on average across 100+ games, scoring 34/100 vs 28/100 in our gaming rating.

speedHow much faster is Core i7-8700K than Core i5-8400?expand_more

21% faster on average. The gap varies by game and resolution, check the per-game FPS comparison above.

aspect_ratioWhich is better for 1440p and 4K gaming, Core i5-8400 or Core i7-8700K?expand_more

The Core i7-8700K is faster at both resolutions. Toggle the resolution selector above to see per-game FPS.

paidIs the Core i7-8700K worth buying in 2026?expand_more

It scores 34/100 in our gaming rating, faster than most CPUs on the market. Good buy if the price is right.

differenceWhat is the difference between Core i5-8400 and Core i7-8700K?expand_more

Performance: Core i5-8400 scores 28/100, Core i7-8700K scores 34/100. They also differ in core count, clock speeds, L3 cache, and power draw. Full breakdown in the specs section above.

compressWill the Core i5-8400 or Core i7-8700K bottleneck my PC?expand_more

Depends on the rest of your build, especially your GPU. Swap the paired GPU in the FPS section above to see if it limits performance, or use our bottleneck calculator for a full analysis.

upgradeIs it worth upgrading to the Core i5-8400 or Core i7-8700K?expand_more

The Core i7-8700K is the stronger pick at 34/100. Compare your current CPU against it to see the exact FPS gain across 100+ games.