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Problems with >16GB RAM in P6T SE

Last response: in Motherboards
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August 9, 2010 2:12:24 PM

System runs OK with 4 x KVR1066DN3N7/4G (on the compatibility list for the mb) installed but when I add the final pair performance slows dramatically and CPU usage increases significantly (to the point where even small tasks require 98% CPU usage and the system is practically unusable).

I have tried swapping around bays / slots / chips with same success / failure results. Also tried with 2 x 2GB chips in final 2 slots - same result. But with all slots filled with 2GB 1.6v Corsair 1600 chips everything works fine.

Tried clean boot - no conflict identified, didn't fix problem. Tried increasing DRAM bus voltage to 1.58 - made no difference. Is there a tested bios setting for 6 x KVR1066DN3N7/4G with my processor/MB that is known to work? My PSU is 1000w - so there should be enough power.

Spec:

*Product Model : P6T SE
*Motherboard BIOS Revision : 0808 (set to defaults - which according to Kingston should work)
*CPU Type : I7 920
*CPU Speed : 2.67
*Memory Vendor : KINGSTON
*Memory Model : KVR1066D3N7/4G (all tested with memtest - zero faults)
*Memory Used : 24GB (X6)
*Operating System : Windows 7 64bit

Any suggestions or even theories greatly appreciated.

Cheers,

David

More about : problems 16gb ram p6t

August 31, 2010 12:36:21 PM

Have you tried down clocking your memory to a rated speed like 1066 or 1333. I have heard some people having problems with overclocking the memory when all six slots are filled.
August 31, 2010 1:24:33 PM

Hi Adaman,

Downclocking didn't help - just seems the memory won't work in the final two slots. I ended up solving the problem by switching to the Asrock supercomputer x58 mobo in which everything worked perfectly out of the box.

Lessons learnt - Kingston support were really helpful with lots of specific suggestions - Asus support took their time and pretty much said I was on my own (not even prepared to suggest memory which they guaranteed to work!)

D.
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August 31, 2010 3:00:21 PM

Well I'm glad you solved the problem. I hope I don't run into any problems with my asus motherboard after hearing about their crappy customer service. Maybe when I was trying to decide between the Asrock x58 and the asus p6t v2, I should of gone with the Asrock:) 
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