Select any two CPUs for comparison
VS

Gaming Performance Comparison

Recommended System Requirements
Game Core i7-6700K 4-Core 4.0GHz Opteron 6238
Red Dead Redemption 2 9% 56%
Call of Duty: Modern Warfare 33% 16%
Halo: Reach 63% 36%
Cyberpunk 2077 23% 32%
Star Wars: Jedi - Fallen Order 0% 72%
Borderlands 3 9% 56%
Resident Evil 3 Remake 15% 46%
Detroit: Become Human 23% 33%
Microsoft Flight Simulator 2% 70%
FIFA 20 35% 12%

In terms of overall gaming performance, the Intel Core i7-6700K 4-Core 4.0GHz is massively better than the AMD Opteron 6238 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 over three years more recently than the Opteron 6238, and so the Core i7-6700K 4-Core is likely to have far better levels of support, and will be much more optimized and ultimately superior to the Opteron 6238 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 Opteron 6238 has 8 more cores than the Core i7-6700K 4-Core. 12 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 Opteron 6238, it would seem to be a decent choice.

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 Opteron 6238 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 Opteron 6238 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 Core i7-6700K 4-Core has a 24 KB bigger L2 cache than the Opteron 6238, but on the other hand, it is the Opteron 6238 that has a 16376 MB bigger L3 cache than the Core i7-6700K 4-Core. In this case, the L2 size is probably what counts, so the Core i7-6700K 4-Core is likely superior in this area.

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 24 Watt lower Maximum TDP than the Opteron 6238, 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 Opteron 6238, 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-SInterlagos
MoBo SocketLGA 1151Socket G34
Notebook CPUnono
Release Date05 Aug 201514 Nov 2011
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores4vs12
CPU Threads8vs-
Clock Speed4 GHzvs2.6 GHz
Turbo Frequency4.2 GHzvs-
System Bus -vs6400 MHz
Max TDP91 Wvs115 W
Lithography14 nmvs32 nm
Bit Width64 Bitvs-
Max Temperature-vs70°C
Virtualization Technologynovsyes
Comparison

CPU Cache and Memory

L1 Cache Size256 KBvs48 KB
L1 Cache Count-vs12
L2 Cache Size1024 KBvs1000 KB
L2 Cache Count-vs12
L2 Cache Speed-vs2600 MHz
L3 Cache Size8 MBvs16384 MB
Max Memory Size-vs-
Memory Channels-vs-
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.
Opteron Dodeca Core 6238 is a 12-Core Server CPU part of the Opteron 6200 Series released by AMD in 2011/2012.
Each Core is clocked at 2.6 and features one thread, making a total of 12.
Obviously not designed for gaming, due to its tremendous price, it will deliver great performance for those crazy enough to use for extreme gaming performance.

Vendor-Specific Features

Intel Quick Sync VideoAMD Power Management
Intel InTru 3DAMD Business Class
Intel InsiderAMD Black Edition
Intel Wireless Display
Intel Flexible Display
Intel Clear Video HD
Intel vPro
Intel Hyper-Threading
Intel Virt. Tech. for Directed I/O
Intel Trusted Execution
AES New Instructions
Intel Anti-Theft
Idle States
Intel SpeedStep
Thermal Monitoring
Execute Disable Bit
Intel VT-x with EPT
Embedded Options

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