F3-12800cl8d-4gbrm / m4a79xtd evo

[WeedReaper]

Memory: F3-12800CL8D-4GBRM
Motherboard: M4A79XTD EVO
Bios Rev: 0605
CPU: AMD Phenom II X4 955

This is a new build and I am currently experiencing stability issues. I am getting graphical anomalies and freeze ups after about 2 hours of gaming. I have swapped video cards and ruled that out. I have also ran memtest for 6 hours on these settings and received no errors.
Current settings are 8-8-8-24-34 1T 1.66v 1600mhz
I have not changed any other voltages.

Thank you for your help.

[Tradesman]

Might want to change Command Rate to 2T, it shows as 1T in your settings

[WeedReaper]

Changed the Command Rate to 2T. After that windows failed to boot. When I did get windows to start I had an error message saying that the registry was corrupted. Ran memtest and received a failure message on test 5. Also ran Prime95 "Blend" test and got a failure after about 5 minutes.

[WeedReaper]

Powered up the PC this morning and ran memtest86 for 9 hours one one stick of RAM, no errors. Put the second stick back in and restarted. Received memtest86 errors on test 5 (block move) Errors occurred just under the 500mb range.

I will repeat this test tomorow with the second stick.

[WeedReaper]

No errors on the second stick of memory after 10 hours. Used the same slot as the first stick. I will test both sticks during the day tomorow.