GA-MA790X-UD4 and 8gb of Kingston KHX8500D2K2 4x2gb

[mordred]

Hi everyone!

I used to have 4gb installed clocked at 1066mhz (2.2v 5-5-5-15 as Kingston sais) with no problem. When I added 4gb more I had blue screens... I run MemTest and realised that I have errors at 1066 Mhz whatever configuration. Only by clocking the ram at 800mhz I was error free. It's realy fustrating cause the Ram modules are expensive and it's a bumer I can get what they should give...
PS I've the latest beta bios 7b but I don't think that's the problem...
Any suggentions?

[absic]

Hi,

what CPU are you running?

[mordred]

Phenom II 920 X4 AM2+

[absic]

Hi,

checking out the QVL for your mobo it states:
Note: Due to AMD AM2+ CPU limitation, memory module DDR2 1066 or above speed is only supported by 1 dimm per channel (here's the link: http://www.giga-byte.co.uk/FileList/MemorySupport/motherboard_memory_ga-ma790x-ud4.pdf )

You now have 2 dimms per channel, so I guess this is the problem.

However, the difference between 4 gig running at 1066Mhz  or 8 gig running at 800 Mhz would only really be noticed in benchmarks and having the larger amount of memory even if it is a little slower, is in my opinion, the better choice.

The other option would be to replace the CPU to an AM3 version.

Hope this helps.

[mordred]

Is this a limitation of the socket or the CPU? Because I read systems with this mobo running 8gb of RAM at 1066 with no problem...

[absic]

Hi,
as mentioned in my previous reply, it's due to the CPU.....

Note: Due to AMD AM2+ CPU limitation, memory module DDR2 1066 or above speed is only supported by 1 dimm per channel

[mordred]

Ok thank you guys. I'll clock them to 1066 when I upgrade to an AM3...