I'm going to buy Asus P7P55D-E PRO motherboard. I read QVL from Asus site and I noticed something strange about DDR3 memory voltage. All 4GB memory kits of two sticks (listed in QVL) operate with voltage of 1.8V or 1.9V according to QVL. It does not depend on memory manufacturer (the only exclusion is G.Skill) or frequency. It depends only on number of 2GB sticks. If there are two sticks, then voltage is 1.8-1.9V; if there is one stick or three sticks then everything more or less normal - voltage is 1.65V o lower.
I also read QVL for P7P55D Deluxe and there is the same thing.
So, I'd like to ask:
Does anyone use Kingston, Corsair, OCZ or Mushkin 4GB dual memory kits on P7P55D-E PRO (or similar Asus motherboard)? What memory voltage do you have?
How about these particular 4GB kits:
I wanted to buy G.Skill memory at first. But it seems almost impossible to find it in my country, so I have to look for another brand.
It means that 4 sticks also work fine and problem occurs (according to Asus QVL) when only two dual-channel slots are occupied. Unfortunately, I'm a little tight on budget, so I would like to purchase only one 4GB memory kit.
You need to pick RAM that runs at or below 1.65v. Anything above that voltage will damage the on-board RAM controller on the CPU. For example, the Kingston HyperX RAM you linked to above would NOT be a good option for an Intel system since it runs at 1.9v. A lot of people are having problems with OCZ RAM lately. If G.Skill RAM isn't available to you then I would get one of the Corsair kits that run at or below 1.65v.
Ok, if the RAM that u list are ur only option stay away from the Corsair since are CL9 that isn't good for performance the same goes for the Kingston. Also one of the Corsair is rated @1.9V that is dangerous for the memory controller of the mobo.
The only available and good options are OCZ:
1- OCZ OCZ3P1333LV4GK: Good CL and good voltage @1333MHz
2- OCZ OCZ3P13334GK: Good CL too, but with 1.8V that is dangerous for the memory controller of ur mobo, so, avoid this one.
3- OCZ OCZ3P16004GK: The same that the above RAM, high voltage.
4- OCZ OCZ3P1600EB4GK: Very good CL but with the same problem that the last two models, the voltage is very high.
So, the only good option that I can see is the OCZ OCZ3P1333LV4GK
I, personally, would pick the SLIGHTLY slower CAS9 Corsair RAM over some flakey OCZ RAM. I'm certainly not the only one avoiding OCZ until they can get their act together. I've done more than my fair share of helping people try to diagnose system instability only to find the problem is their OCZ RAM.
I am planning to buy the same motherboard with Intel Core i7 870 processor. When I went through the compatible memory for the processor, I found that this motherboard is not mentioned there; but the earlier version ASUS P7P55D Pro motherboard is mentioned; for this, the Intel certified the memory OCZ DDR-3 1600MHz unbuffered non-ECC firstname.lastname@example.orgV 2x2GB Dual Channel set - OCZ3X1600R2LV4GK. Can we use this RAM set for this motherboard? I am not able to download QVL from ASUS as the sites are always busy.