POSTing problems with Asus P5Q Pro motherboard

[SirFelixCat]

Hi, everyone. Hope someone can help.

Just built a computer for a friend, but we're having problems with it. Here are the specs:

Motherboard: ASUS P5Q Pro LGA 775 Intel P45 ATX
CPU: Intel Core 2 Quad Q6600 Kentsfield 2.4GHz LGA 775 Quad-Core Processor
Power supply: CORSAIR CMPSU-650TX 650W ATX12V / EPS12V
RAM: 2 G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) (5-5-5-15)

The RAM is listed on the QVL for the motherboard.

The computer will POST when there is RAM in the following:

- each slot, one stick of RAM at a time
- both black slots
- A1 and A2 (the first yellow and first black slots)
- B1 and B2 (the second yellow and second black slots)

Because it will POST with one stick of RAM in each slot, this would make me think that all of the slots are working alright.

The computer will not POST when there is RAM in the following:

- A1 and B1 (both yellow slots)
- any combination of yellow and black and both bays (i.e. A1/A2/B1; A1/A2/B2; A1/B1/B2; A2/B1/B2; A1/A2/B1/B2)

I found this thread, and followed the directions by OVERKILL, which was to up the RAM Core to 1.98v. That did nothing, it still behaved the same way.

Help, anyone? Please.

 

[SirFelixCat]

Okay, it looks like we found the problem.

We found the QVL:
QVL link

And it looks like the type of RAM we got won't work with more than "one pair of modules inserted into either the yellow slots or the black slots as one pair of Dual-channel memory configuration".

So, oops. BUT, for anyone in the future, make sure you look at the QVL for this board and make sure the RAM you select, if you want to use 8GB, has a "V" in the "C" column.

 

[pcswig09]

I just completed a build with this mobo and OCZ PC6400 RAM from the QVL list, and this RAM does have a "V" in the C column. I bought 8gb (4x2gb) for the build, after looking over the QVL in the manual. Now that I have it assembled, it will boot with memory in two slots (yellow) but when I install the other 4gb (2 sticks) in the black slots, it won't POST. Just sits there. This is driving me nuts. Is there some BIOS tweak I have to change to make the 8gb work? I have set the DRAM voltage to 2.1 and the DRAM Freq to DDR2-800mhz.
Any ideas?
Thanks