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Gaming Performance Comparison

Recommended System Requirements
Game Core i7-6700K 4-Core 4.0GHz Phenom II X6 1055T v2
Red Dead Redemption 2 9% 65%
Call of Duty: Modern Warfare 33% 22%
Halo: Reach 63% 32%
Cyberpunk 2077 23% 40%
Star Wars: Jedi - Fallen Order 0% 82%
Borderlands 3 9% 65%
Resident Evil 3 Remake 15% 54%
Detroit: Become Human 23% 41%
Microsoft Flight Simulator 2% 79%
FIFA 20 35% 18%

In terms of overall gaming performance, the Intel Core i7-6700K 4-Core 4.0GHz is massively better than the AMD Phenom II X6 1055T v2 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 Phenom II X6, 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 Phenom II X6 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 Phenom II X6 has 2 more cores than the Core i7-6700K 4-Core. 6 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.

The Core i7-6700K 4-Core has 2 more threads than the Phenom II X6. The Phenom II X6 has one thread per physical core, whereas the Core i7-6700K 4-Core uses hyperthreading and has 2 logical threads per physical core.

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 Phenom II X6 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 1.2 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 Phenom II X6 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 Phenom II X6 has a 2048 KB bigger L2 cache than the Core i7-6700K 4-Core, but on the other hand, it is the Core i7-6700K 4-Core that has a 2 MB bigger L3 cache than the Phenom II X6. In this case, the L2 size is probably what counts, so the Phenom II X6 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 4 Watt lower Maximum TDP than the Phenom II X6, and was created with a 31 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 Phenom II X6, 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-SThuban
MoBo SocketLGA 1151Socket AM3
Notebook CPUnono
Release Date05 Aug 201501 May 2010
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores4vs6
CPU Threads8vs6
Clock Speed4 GHzvs2.8 GHz
Turbo Frequency4.2 GHzvs3.3 GHz
Max TDP91 Wvs95 W
Lithography14 nmvs45 nm
Bit Width64 Bitvs64 Bit
Max Temperature-vs71°C
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size256 KBvs768 KB
L2 Cache Size1024 KBvs3072 KB
L3 Cache Size8 MBvs6 MB
Max Memory Size-vs-
Memory Channels-vs2
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.
Phenom II X6 1055T v2 is a high-end processor based on the 45nm Leo architecture.

It offers 6 Physical Cores (6 Logical), initially clocked at 2.8GHz, which may go up to 3.3GHz and 6MB of L3 Cache.
Among its many features, Turbo Core and Virtualization are activated and the clock multiplier is unlocked, meaning it can be overclocked easily.

The processor DOES NOT integrate any graphics. and has a rated board TDP of 95W.

It is a powerful processor whose performance is good. It's thus capable of running most applications smoothly without any problem.

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