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Gaming Performance Comparison

Recommended System Requirements
Game Core i7-6700K 4-Core 4.0GHz Xeon E5-2660 v3
Red Dead Redemption 2 9% 7%
Call of Duty: Modern Warfare 33% 31%
Cyberpunk 2077 23% 21%
Star Wars: Jedi - Fallen Order 0% 3%
Halo: Reach 63% 61%
Borderlands 3 9% 7%
FIFA 20 35% 33%
eFootball PES 2020 26% 23%
Fortnite: Chapter 2 50% 49%
Detroit: Become Human 23% 20%

In terms of overall gaming performance, the Intel Core i7-6700K 4-Core 4.0GHz is very slightly better than the Intel Xeon E5-2660 v3 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 i7-6700K 4-Core was released less than a year after the Xeon E5-2660 v3, and so they are likely to have similar levels of support, and similarly optimized performance when 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 Xeon E5-2660 v3 has 6 more cores than the Core i7-6700K 4-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 i7-6700K 4-Core is more than enough for gaming purposes. However, if you intend on running a server with the Xeon E5-2660 v3, it would seem to be a decent choice.

The Xeon E5-2660 v3 has 12 more threads than the Core i7-6700K 4-Core. Both the Core i7-6700K 4-Core and the Xeon E5-2660 v3 use hyperthreading. The Core i7-6700K 4-Core has 2 logical threads per physical core and the Xeon E5-2660 v3 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 i7-6700K 4-Core and Xeon E5-2660 v3 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 i7-6700K 4-Core has a 1.4 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. In this case, however, the difference is probably a good indicator that the Xeon E5-2660 v3 is superior.

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 Xeon E5-2660 v3 has a 1536 KB bigger L2 cache than the Core i7-6700K 4-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 i7-6700K 4-Core has a 14 Watt lower Maximum TDP than the Xeon E5-2660 v3, and was created with a 8 nm smaller manufacturing technology. What this means is the Core i7-6700K 4-Core will consume slightly less power and consequently produce less heat, enabling more prolonged computational tasks with fewer adverse effects. This will lower your yearly electricity bill slightly, as well as prevent you from having to invest in extra cooling mechanisms (unless you overclock).

The Core i7-6700K 4-Core has an on-board GPU, which means that it will be capable of running basic graphics applications (i.e., games) without the need for a dedicated graphics card. The Xeon E5-2660 v3, however, does not, and you will probably have to look for a dedicated card if you wish to use it at all.

For in-depth GPU comparisons with the HD i7 6700K, click on the following GPU overview comparison icon (visible throughout Game-Debate), and choose a GPU from the list to compare against:

On-board GPUs tend to be fairly awful in comparison to dedicated cards from the likes of AMD or Nvidia, but as they are built into the CPU, they also tend to be cheaper and require far less power to run (this makes them a good choice for laptops). We would recommend a dedicated card for running the latest games, but integrated GPUs are improving all the time and casual gamers may find less recent games perform perfectly acceptably.

CPU Core Details

CPU CodenameSkylake-SHaswell-EP
MoBo SocketLGA 1151LGA 2011/Socket R
Notebook CPUnono
Release Date05 Aug 201501 Sep 2014
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores4vs10
CPU Threads8vs20
Clock Speed4 GHzvs2.6 GHz
Turbo Frequency4.2 GHzvs-
Max TDP91 Wvs105 W
Lithography14 nmvs22 nm
Bit Width64 Bitvs64 Bit
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size256 KBvs640 KB
L2 Cache Size1024 KBvs2560 KB
L3 Cache Size8 MBvs25 MB
Max Memory Size-vs-
Memory Channels-vs4
ECC Memory Supportnovsno
Comparison

CPU Graphics

GraphicsHD i7 6700K
Base GPU Frequency350 MHzvs-
Max GPU Frequency1150 MHzvs-
DirectX12.0vs-
Displays Supported-vs-
Comparison

CPU Package and Version Specifications

Package Size-vs-
Revision-vs-
PCIe Revision-vs-
PCIe Configurations-vs-

Gaming Performance Value

Performance Value

CPU Mini Review

Mini ReviewCore i7-6700K 4-Core 4.0GHz is a high-end CPU based on the 14nm, Skylake MicroArchitecture.

It offers 4 Physical Cores (8 Logical), initially clocked at 4.0GHz, which may go up to 4.2GHz and 8MB of L3 Cache.
Among its many features, HyperThreading, Turbo Boost 2.0 and Virtualization are activated and the processor has its multiplier unlocked.

The processor integrates Powerful Graphics called HD i7 6700K, with 24 Execution Units, initially clocked at 350MHz and that go up to 1150MHz, in Turbo Mode which share the L2 Cache and system RAM with the processor.
Both the processor and integrated graphics have a rated board TDP of 91W.

Its performance is exceptionally good and enough for even the most demanding applications.
Xeon E5-2660 v3 is an upcoming server processor based on the 22nm, Haxwell microarchitecture.

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