Yes, it was that MemTest. Is there another kind? I used MemTestx86 v7.
At the moment it is on ASUS Optimal (the stock performance setting) and C6 was the only thing that wasn't disabled.
My BIOS settings are slightly changed around because it minimized the crashes, I underclocked a bit:
Ai Overclock Tuner: Manual
CPU Ratio: 15.5
AMD Turbo Core: Disabled
CPU Bus Freq: 216
PCIE Freq: 100
Mem Freq: DDR3-1151Mhz
Fast boot is disabled and that's it. Sorry, I forgot to mention it.
I get a RSod after 2 minutes of boot with those changes you told me to do.
There are numerous FX-9590 threads here that address most every issue people have experienced with these 220w CPUs which require not only a proper mobo designed for the 220w CPU, a proper HSF or other cooler to properly cool the FX-9000 series CPUs to 61C or lower and a 35 CFM or greater fan cooling the VRM circuit of the mobo due to the 220w load from the FX-9000 series CPUs. Once the most basic parameters are handled appropriately, then you need to dial in all of the BIOS settings as the "auto" mode of many mobos will not set the BIOS settings to what the FX-9000 series or even FX-8000 series CPUs require for Prime95 stability.
Obviously the RAM must be error free under Memtest86+ V5 or newer. If not then you need to resolve this issue before moving on.
Make sure to check the CPU temp under heavy load to be certain it does not exceed 61C? The applets Core Temp, Aida64 and HWiNFO will show you pretty accurate temps in the 60C-70C temp range. If your CPU exceeds 61C under heavy load then this problem must be resolved. If your CPU temp stays at or below 61C under heavy load then I'd recommend the settings below because mobo "auto" settings do not work well with high powered 8-core FX CPUs IME.
This is what I would recommend:
1. Disable C6, C1E and Cool & Quiet - this will NOT hurt anything, they are just power saving modes
2. Manually set the CPU to the specified default vcore shown for your specific CPU
3. Manually set the DRAM timings listed on the DIMMs - assuming they were purchased as ONE DIMM kit and NOT two individual DIMMs. If bought as two independent DIMMs you likely will need slower timings to prevent issues.
4. If the DIMMs are 1.5v increase the voltage to 1.55v
5. Set CPU NB to 1.25v and HT to 1.25v-1.28v
6. Set Hyper transport frequency to 2600 MHz.
7. Set Northbridge frequency to 2400 MHz.
Run the system in Manual mode - NOT "auto" mode and set the CPU multiplier to "23.5" for the FX-9590 and "20" for the FX-8350, Etc.
None of these settings are crazy nor should they cause any issues with your PC. I and other folks have run these settings for years without issue on many different brands and models of mobos using FX 8-core CPUs at OE frequencies as well as overclocked 8-core CPUs . You may need to play around with the vcore power stability settings (LLC or similar), when in manual mode to insure the vcore voltage stay close to what you have set it in the BIOS when under heavy load. Applets like OCCT or similar that will record the CPU temp/vcore/frequency are very helpful in fixing operational problems