Can't even boot with 4gb, 975x Plat PowerUP, XP Pro 3d bit

Hey all, I've had a Core 2 Duo e6600 running on a 975x Platinum PowerUP edition since august now with 2 GB of memory. I recently added an additional 2GB.
I understand that I may never actually see all 4gb of memory in Windows as I only have Windows XP Pro 32 bit, but it my OS won't even boot with the other 2 sticks in there (4gb). I get a BSOD on the loading screen. The BIOS detects all 4gb correctly. I have tried the /PAE switch and /noexecute=optin swith and neither work. I've even tried disabling PAE and putting /noexecute=alwaysoff in there and I still can't boot (you'd think that I'd be able to at least get it to boot with 3.25 or whatever GB showing up, right?). I have the current official 7.40 BIOS. Does anyone have any advice for me?
Summary: 4GB recognized by bios, Win XP Pro 32 bit won't boot BOTH with or without /PAE and /noexecute=optin(or AlwaysOff).
Conroe E6600 and 975x Plat PUP bios v 7.40
THANKS!

Run memtest with all 4 dimms installed - Since it's valueram there's a chanse those sticks are not identical. They just use the cheapest chips they can find at the time to produce valueram, so even if you buy valueram from the same make and type, but at a diffirent time, they might still use diffirent chips ...
Non-identical RAM can cause errors in a dual channel enviroment (wich your core2 is)...
Core2 64 bit performance is where it should be. Just as fast as 32 bit for normal applications and loads faster for applications wich put the extra cpu registers to use...

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