Select any two CPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game Core i9-9900X 10-Core 3.5GHz Core i7-8700 6-Core 3.2GHz
Red Dead Redemption 2 46% 31%
Call of Duty: Modern Warfare 60% 49%
Cyberpunk 2077 54% 42%
Halo: Reach 78% 72%
Star Wars: Jedi - Fallen Order 41% 24%
Microsoft Flight Simulator 42% 25%
Borderlands 3 46% 31%
Detroit: Become Human 54% 41%
FIFA 20 62% 51%
eFootball PES 2020 56% 44%

In terms of overall gaming performance, the Intel Core i9-9900X 10-Core 3.5GHz is massively better than the Intel Core i7-8700 6-Core 3.2GHz when it comes to running the latest games. This also means it will be less likely to bottleneck more powerful GPUs, allowing them to achieve more of their gaming performance potential.

The Core i9-9900X 10-Core was released over a year more recently than the Core i7-8700 6-Core, and so the Core i9-9900X 10-Core is likely to have better levels of support, and will be more optimized for running the latest games.

Both CPUs exhibit very powerful performance, so it probably isn't worth upgrading from one to the other, as both are capable of running even the most demanding games at the highest settings (assuming they are accompanied by equivalently powerful GPUs).

The Core i9-9900X 10-Core has 4 more cores than the Core i7-8700 6-Core. 10 cores is probably excessive if you mean to just run the latest games, as games are not yet able to harness this many cores. The cores in the Core i7-8700 6-Core is more than enough for gaming purposes. However, if you intend on running a server with the Core i9-9900X 10-Core, it would seem to be a decent choice.

The Core i9-9900X 10-Core has 8 more threads than the Core i7-8700 6-Core. Both the Core i9-9900X 10-Core and the Core i7-8700 6-Core use hyperthreading. The Core i9-9900X 10-Core has 2 logical threads per physical core and the Core i7-8700 6-Core has 2.

Multiple threads are useful for improving the performance of multi-threaded applications. Additional cores and their accompanying thread will always be beneficial for multi-threaded applications. Hyperthreading will be beneficial for applications optimized for it, but it may slow others down. For games, the number of threads is largely irrelevant, as long as you have at least 2 cores (preferably 4), and hyperthreading can sometimes even hit performance.

More important for gaming than the number of cores and threads is the clock rate. Problematically, unless the two CPUs are from the same family, this can only serve as a general guide and nothing like an exact comparison, because the clock cycles per instruction (CPI) will vary so much.

The Core i9-9900X 10-Core and Core i7-8700 6-Core are not from the same family of CPUs, so their clock speeds are by no means directly comparable. Bear in mind, then, that while the Core i9-9900X 10-Core has a 0.3 GHz faster frequency, this is not always an indicator that it will be superior in performance, despite frequency being crucial when trying to avoid GPU bottlenecking. As such, we need to look elsewhere for more reliable comparisons.

Aside from the clock rate, the next-most important CPU features for PC game performance are L2 and L3 cache size. Faster than RAM, the more cache available, the more data that can be stored for lightning-fast retrieval. L1 Cache is not usually an issue anymore for gaming, with most high-end CPUs eking out about the same L1 performance, and L2 is more important than L3 - but L3 is still important if you want to reach the highest levels of performance. Bear in mind that although it is better to have a larger cache, the larger it is, the higher the latency, so a balance has to be struck.

The Core i9-9900X 10-Core has a 8704 KB bigger L2 cache than the Core i7-8700 6-Core, which means that it, at worst, wins out in this area, and at best, will provide superior gaming performance and will work much better with high-end graphics cards.

The maximum Thermal Design Power is the power in Watts that the CPU will consume in the worst case scenario. The lithography is the semiconductor manufacturing technology being used to create the CPU - the smaller this is, the more transistors that can be fit into the CPU, and the closer the connections. For both the lithography and the TDP, it is the lower the better, because a lower number means a lower amount of power is necessary to run the CPU, and consequently a lower amount of heat is produced.

The Core i7-8700 6-Core has a 100 Watt lower Maximum TDP than the Core i9-9900X 10-Core (though they were created with the same size 14 nm manufacturing technology). What this means is the Core i7-8700 6-Core will consume significantly less power and consequently produce less heat, enabling more prolonged computational tasks with fewer adverse effects. This will lower your yearly electricity bill significantly, as well as prevent you from having to invest in extra cooling mechanisms (unless you overclock).

CPU Core Details

CPU CodenameSkylake XCoffee Lake
MoBo SocketSocket 2066LGA 1151
Notebook CPUnono
Release Date30 Nov 201805 Oct 2017
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores10vs6
CPU Threads20vs12
Clock Speed3.5 GHzvs3.2 GHz
Turbo Frequency4.4 GHzvs4.6 GHz
Max TDP165 Wvs65 W
Lithography14 nmvs14 nm
Bit Width64 Bitvs64 Bit
Max Temperature92°Cvs-
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size640 KBvs-
L2 Cache Size10240 KBvs1536 KB
L3 Cache Size19.25 MBvs12 MB
Max Memory Size-vs-
Memory Channels-vs2
ECC Memory Supportnovsno
Comparison

CPU Graphics

Graphics
Base GPU Frequency-vs-
Max GPU Frequency-vs-
DirectX-vs-
Displays Supported-vs-
Comparison

CPU Package and Version Specifications

Package Size52.5 mm 45 mmvs-
Revision-vs-
PCIe Revision-vs-
PCIe Configurations-vs-

Gaming Performance Value

Performance Value

CPU Mini Review

Mini ReviewThe Intel Core i9-9900X 10-Core 3.5GHz is a high-end CPU based on the 14nm Skylake-X micro architecture. It is competing against AMD's 2nd Gen Ryzen Threadripper processors. It offers 10 physical cores (20 logical), initially clocked at 3.5GHz which may go up to 4.4GHz with Turbo Boost enabled, and 19.25MB of L3 Cache. Among its many features are Turbo Boost Max 3.0 technology, Hyper-Threading, Virtualization is activated. As an 'Extreme' variant, this processor has its multiplier unlocked and overclocking is possible. With a 165W TDP, the Core i9-9900X 10-Core is very power hungry and will require a high-end PSU. This CPU is likely to offer exceptional computational performance and will not be the bottlenecked in any modern gaming PC. It will be able to play all AAA titles.The Core i7-8700 6-Core 3.2GHz is a high-end CPU based on the 14nm Coffee Lake micro architecture. It offers 6 physical cores (12 logical), initially clocked at 3.2GHz, which may go up to 4.3GHz using 6 cores with Turbo Boost, or up to 4.6GHz boost clock on a single core. The i7-8700 has 12MB of L3 Cache. Among its many features, HyperThreading, Turbo Boost 2.0 and Virtualization are activated. This processor does not have multiplier unlocked. Therefore, you cannot overclock the Core i7-8700. This Core i7-8700 CPU offers excellent gaming performance and will not be the bottleneck in any modern gaming PC. It will be able to play all modern games comfortably on high/ultra graphics performance without being a hindrance to the accompanying GPU.

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