GA-MA790X-UD3P F7a failing 8 GB RAM

[Dark Mantis]

Well let's hope that was indeed true and the system works ok now. Please keep in touch and let us know how it goes.

[autotech]

Longest i got mine to work was a few day and i tested all memory by 4 gigs at a time and all were fine. Bet hes back i truly think its the memory controller in the cpu. I have had the 965 actually 2 of them anad the 9950 and the 3.0 be to many to count and until the x6 never could stay stable for long with 8 gigs.

[Dark Mantis]

I wouldn't be surprised after what I learnt from absic it does indeed sound like a problem with the memory controller.

[absic]

Longest i got mine to work was a few day and i tested all memory by 4 gigs at a time and all were fine.
I truly think its the memory controller in the cpu.

There does appear to be some major difficulty in getting RAM to run with some of the AMD CPU's and normally this is only resolved by running the RAM at 1333 Mhz or less and this still doesn't guarantee system stability. Not really sure if this is a CPU memory controller issue or one due to BIOS but as it seems to be a problem on other makes of Mobo too, I tend to lean towards the CPU Memory Controller being the cause.

UPDATE:
Having done some further research on this issue it might be worth noting that on AMD's website it states that for the Phenom ii CPU's: Type of Memory Supported =  Support for unregistered DIMMs up to PC2 8500(DDR2-1066MHz) and PC3 10600 (DDR3-1333MHz) Check here: http://www.amd.com/us/products/desktop/processors/athlon-ii-x2/Pages/AMD-athlon-ii-x2-processor-model-numbers-feature-comparison.aspx

There are a couple of other interesting items to read, they are a little bit old now but I think they are still relevant:
http://en.wikipedia.org/wiki/Phenom_II
http://tech.icrontic.com/news/amd-explains-phenom-ii-memory-downclocking/

As most of the information available on the internet seem to be a little dated now, I am going to be running some test using a 965 and 1090T CPU to see if this is still accurate or if some of the newer BIOS updates have solved the problems.