I've got a BFG Nvidia 6800GT graphics card. For some reason when I try to play any graphic intense games I start seeing artifacting and sometimes the card will freeze up for a second. Just to be clear the games I'm playing are Americas Army, Battlefield Vietnam, and Battlefield 2142. Thinking my power supply was to blame I upgraded to a rosewill 550w with dual 12v rails(20a on 1st rail 18a on the other) and active pfc.Here is the link if you want to check it out
http://www.newegg.com/Product/Product.asp?Item=N82E16817182042
I boosted the agp slot voltage to 1.7(the max my mobo lets me) Is this psu not able to handle the 6800gt either? I installed coolbits and dropped the core and mem clock witch eliminates artifacting and freezing in all of the games except for Battlefield 2142.
All of the settings for the games are at there highest except for BF 2142 witch is set to low and still artifacting and freezing. If I edited the card bios and boosted the voltage would it help? My system is a Asus K8N mobo, 1 gig ddr 3200, dvd writer, fan controller, 5 case fans, 2 WD 80gig sata drives, and a floppy drive.(All the fans are led, but I tried unplugging them all and the card still wouldn't run right) Any help would be apprecieated!

I doubt you'll find to many people recommending Rosewill in these forums. They don't manufacture ANYTHING...all they do is relabel OEM manufacturer's products & sell them as their own.

According to the pics at newegg, that particular model has a UL number of E223918 meaning it was made by SOLYTECH ENTERPRISE CORP, TAIWAN. Soly-Tech PSUs are commonly sold under the APEX brand name. Your model number is SL-8550EPS...if you google that number, it will come up as an APEX PSU. I'm not saying that's a good or bad thing, but you should be aware of what you have.

The 6800GT pulls most of it's power from the +12v rail, not the AGP slot. Upping the AGP voltage will do little or nothing & I wouldn't advise tampering with the card's BIOS...you don't even know what's causing the problem!

http://www.xbitlabs.com/articles/video/display/ati-vs-nv-power_3.html

Thanks, I didn't know that rosewill didn't make there own stuff. I checked the voltages through the mobo, and everything is stable and most of the reviews I read said it was o.k. Is there anyway to actively monitor the voltage on the 12v rail while the card has a load on it? Oh, yea thanks for the link, I'm still learning on all this voltage stuff :)