New build not running nearly how it should...

[VigilanteCS]

Hi all. I just assembled my new computer today consisting of:

E6750 C2D
Gigabyte GA-P35-DS3P Motherboard
4 gigs XMS2 ram
eVGA Geforce 8800GTS G92 core
250gig SATA hard drive
550 watt Antec PSU wit 30A on the +12v rail
Windows Vista Ultimate x64

Long story short, it's not doing nearly what it should. The system is running stably, but like crap. Regular desktop browsing is fine, but in games it sucks. Crysis is a complete slideshow at 1024x768 on high detail, and this thing should run it like butter on those settings. What could be possibly culprits? Vista? Should I maybe downgrade to XP pro for a while (even though I'll loose a gig of ram to that)?

My OS is completely updated, I installed the latest nvidia drivers, all of the motherboard drivers are installed and fine. I'm currently downloading 3dmark06 to see what I get, which will be crappy. Thanks for help...I need to know where to begin looking.

 

[VigilanteCS]

I ran 3dmark06 but didn't get through, no application went over 5fps. Thanks for any help guys.

EDIT: I'm also using the latest drivers from evga, 169.28.

 

[angry hampster]

You do have the PSU connected directly to the GFX card via a 6 pin, correct? Dumb question I know, but it's perfectly plausible. Also, that PSU is a bit weak.

 

[VigilanteCS]

Originally posted by: angry hampster
You do have the PSU connected directly to the GFX card via a 6 pin, correct? Dumb question I know, but it's perfectly plausible. Also, that PSU is a bit weak.

Ya. I actually just figured out the problem...I had "HPET" or whatever the hell that is set to 32 bit in the bios, switched it over and 64 bit and all was well. Got 11,636 in 3dmark06. Time for some overclocking . Thanks!

 

[VigilanteCS]

Okay this damn computer has me baffled again. I got it running great, so I started playing around with CPU overclocking, scored an 11,900..bump my CPU to 2.85 from 2.8GHz to see if that'll break 12k...and it starts performing choppy like it did last night. I reset everything in the bios, HPET is good...wtf? I'm so confused.

 

[blipblop]

maybe it doesn't like 4 stocks of RAM? I just built my brother the a very similar rig.

E6750
Abit IP35-E
2 x 1gb XMS2

It's running on a mild overclock @ 3GHz. try it with 2 sticks?