Select any two CPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game Xeon Processor X5677 Core i7-6700K 4-Core 4.0GHz
Red Dead Redemption 2 59% 9%
Call of Duty: Modern Warfare 18% 33%
Zombieland: Double Tap - Road Trip 59% 9%
Cyberpunk 2077 35% 23%
Microsoft Flight Simulator 73% 2%
Borderlands 3 59% 9%
FIFA 20 14% 35%
The Outer Worlds 39% 21%
eFootball PES 2020 31% 26%
Ghost Recon Breakpoint 76% 0%

In terms of overall gaming performance, the Intel Core i7-6700K 4-Core 4.0GHz is massively better than the Intel Xeon Processor X5677 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 Processor X5677, 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 Processor X5677 and the Core i7-6700K 4-Core both have 4 cores, which is not likely to be a limiting factor for gaming.

Both the Intel Xeon Processor X5677 and the Intel Core i7-6700K 4-Core 4.0GHz have the same number of threads. Both the Xeon Processor X5677 and the Core i7-6700K 4-Core use hyperthreading. The Xeon Processor X5677 has 2 logical threads per physical core and the Core i7-6700K 4-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 Xeon Processor X5677 and Core i7-6700K 4-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 i7-6700K 4-Core has a 0.533 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 enough that it possibly indicates the superiority of the .

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 Processor X5677 and the Core i7-6700K 4-Core have the same L2 cache size, but the Xeon Processor X5677 has a 4 MB bigger L3 cache, so in this area, it wins out over the Core i7-6700K 4-Core.

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 39 Watt lower Maximum TDP than the Xeon Processor X5677, and was created with a 18 nm smaller manufacturing technology. What this means is the Core i7-6700K 4-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).

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 Processor X5677, 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 CodenameWestmere-EPSkylake-S
MoBo SocketLGA 1366/Socket BLGA 1151
Notebook CPUnono
Release Date16 Mar 201005 Aug 2015
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores4vs4
CPU Threads8vs8
Clock Speed3.467 GHzvs4 GHz
Turbo Frequency3.73 GHzvs4.2 GHz
Max TDP130 Wvs91 W
Lithography32 nmvs14 nm
Bit Width64 Bitvs64 Bit
Max Temperature80°Cvs-
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size512 KBvs256 KB
L2 Cache Size1024 KBvs1024 KB
L3 Cache Size12 MBvs8 MB
Max Memory Size-vs32 GB
Memory Channels-vs2
ECC Memory Supportnovsno
Comparison

CPU Graphics

GraphicsHD i7 6700K
Base GPU Frequency-vs350 MHz
Max GPU Frequency-vs1150 MHz
DirectX-vs12.0
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 ReviewXeon Processor X5677 is a Server Processor based on the 32nm, Westemere Architecture.

It offers 4 Physical Cores (8 Logical), initially clocked at 3.467GHz, which may go up to 3.73GHz and 12MB of L3 Cache.
Among its many features, Hyper Threading, Turbo Boost and Virtualization are activated.

The processor DOES NOT Integrate any Graphics and has a rated board TDP of 130W.

Though not created for gaming purposes, its performance is very good and sufficient for any of today's games.
Core 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.

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