I've been doing a little testing on my AMD FX-6100 CPU (Ya I know it sucks I bought it for cheap) and I've realized a strangely linear pattern emerging when it comes to the Module design within the CPU.
As all FX users should now, a six core FX CPU isn't actually six cores; but a collection of 3 modules that include 2 64bit Schedulers and L1 caches each, deeming a module as a "2 core unit". This may sound a lot like Intel's HyperThreading, but instead Intel uses a process called SMT (Simultaneous Multi-Threading), which is slightly slower than AMD's solution and that's why AMD markets an 8 Core where Intel would only market a 4 Core with HyperThreading.
Now, my experiment was to watch and see how much extra performance I could squeeze out of my processor by disabling one core per module, therefore giving the other core full access to the 256bit FPU. Also, I wanted to test how this would compare to just setting the Affinity on the ARMA 2 process or disabling 2-4 cores in my processor.
Note that the reason I decided to turn my 6 core processor into a 3 core is because ARMA 2 is not optimized to fully utilize a 6 Core processor, and instead only used 3 cores the majority of the time.
I used Intel Burn Test v2.54 to test, though it will not give good comparisons between manufactures (AMD and Intel) it is very good with comparing within manufacturers (ex. AMD v. AMD)
So if you didn't want to read through that whole spreadsheet, or you don't understand it, I'll break down the final results for you:
Basically, if you're running a highly-intensive program on an FX processor and it does NOT utilize all your cores (ARMA 2 won't fully utilize anything above 4 cores), go to the BIOS and change the AMD ACTIVE CORE CONTROL to "1 Core per CU (Module)" and overclock as much as you can, and you will gain performance, even if you don't overclock. But if the program DOES utilize all of your cores, setting the CPU to only use 1 core per module will only decrease performance.
My System Specs:
AMD FX-6100 CPU
XFX AMD Radeon HD 6870 GPU
8GB of 1333 Mhz 7CL RAM
60GB SSD (System Drive)
1.5 TB 7200 RPM WD Green (Main Drive)
ASROCK 990FX Extreme3 Motherboard
750w Cooler Master PSU
Cooler Master Hyper 212+ CPU Cooler
Edited by crackman, 2012-08-02 @ 15:15.