Asus P5QL-EM Overclocking and Memory issue

[ryboto]

I just switched from a DFI JR P45 T2RS to a Asus P5QL-EM, basically they have the same chipset, P45 variants. I've got 4x1gb DDR2-800 Ballistix, all double sided, all in perfectly good condition. While I was waiting for the Asus, I was using all 4 sticks in an AMD board, an AN-M2. In that system, I can run the memory at DDR2-1000 with 5-5-5-18 timings, 2.14v, or DDR2-800 4-4-4-12 at 2.14v.

Now, in this new board, the default ram speed is DDR2-800 with 5-5-5-18 timings, I've set the vdimm to 2.15v. If I have 4 sticks installed, the system doesn't POST, instead I hear a beep code, 1 long beep, 2 short. Here is what I have tried:

Each stick, by itself in each dimm slot - system will POST
One matched pair installed in either channel(both pairs tested on their own) - system will POST
All 4 sticks - No POST, beep code.

So, basically I've confirmed all of the RAM works, but the system refuses to boot if all 4 are installed.