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Trying to get memory to run at stock speed

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New Member
Sep 4, 2015
Drives : 5x Western Digital RE WD3000FYYZ 3TB Raid 5 & 4x Vertex 4 256gb SSD Raid 0
Raid Card : LSI 9265-8i
Operating System : Windows 7 Pro & Windows 10 Pro x64
Memory : 16 GB 2x G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBRL 9-9-9-24 1.5v
Motherboard : Crosshair IV Extreme
GPU : MSI Radeon HD 7970 Lightning Edition
PSU: CORSAIR AXi series AX1200i 1200W Digital ATX12V v2.31 and EPS 2.92 SLI Ready CrossFire Ready 80 PLUS PLATINUM Certified Full Modular Active PFC Power Supply
CPU : AMD Phenom II X6 1100T Black Edition Thuban 6-Core 3.3GHz

I have been having some issues with memory for a while now.

Originally I had an issue with the memory giving errors when I used 2 sets of dual channel memory as specified above.

Having 3 or more sticks of ram would cause errors in memtest86.

So i tried the normal. Increased voltage to the memory. I found as I increased the voltage to the memory the more errors i would get. From 4 errors an hour at 1.5v i got 14 errors an hour at 1.52v thousands of errors at 1.6v.

Seeing this pattern I decided to lower the voltage and the lower the voltage the less errors i would get.

Finally at 1.45v I got zero errors in memtest

After 20 hours of no errors I decided to try prime 95

In about an hour prime 95 gives me rounding errors and starts shutting cores down.

Puzzled I started doing some research and it was hard to find answers.
Eventually I found a data sheet. I had people saying it does not and people saying it does.

Apparently my CPU does not native support 1600 ram.

So I decided to run the ram at 1333 at 1.5v and I get no errors in memtest and no complaints from prime95

BUMMER! But this makes since. I believe that by down volting the ram I was actually starving it causing it to run slightly slower.

I don't know where to go from here. I believe this requires overclocking the CPU?
What can I do to make this ram work at the 1600 speed.

I have attempted relaxing the timings. 1600 1.5v at 11-11-11-30
I think that is pretty loose but prime 95 does still not like them running at 1600.

What changes do I need to make to allow the cpu to play ball with this ram or am I SOL?