OK guy's... I have been all over the internet and have posted in countless forums hoping someone has an answer for this mystery that has plagued me for a while now. Here are the specs of the first PC that started this mess. //CPU: AMD 64 3200+ //Mobo: MSI Neo Plat. //PSU: 350W - Stock w/ case //RAM: 1024 Centon 3200 //GPU: GeForce 6800 //HD: Maxtor 40 Gig //Audio: Audigy 2 ZS Plat. Pro So here is the thing... I was getting what seemed to be jittering. No loss in frame rates, just plain ole jittering. At no point in time does the rendering completely stop it just jittered on every setting, with every driver. No matter what I did I couldn't fix it. So I figured the card was bad. I went and got the Ultra edition. Installed it and did the same thing. Well that weeded out that it was a card issue and since I didn't need that much power I returned it and got another plain 6800. Same thing! My next step was to try another mobo. Went with the same MSI just a different one. Same thing! Well ok, maybe CPU is having trouble... went and got the AMD 3700+. Yup, same thing! OK well maybe its a power issue... went with a Aspire gaming case that had a 500W PSU, Same thing!... Left scratching my head I said well it must be a RAM issue... went with Corsair TwinX Pro, same thing! WTF???? OK I have had enough, I went to a Pentium CPU and an Asus mobo... same thing! Went with a new HD - WD Raptor 74, same thing! I have played with every setting possible; latecy timing's; Arp sizes; AGP rates; FW's + SB's, driver's, OCing + UC'ing, new monitor's, new install's EVERYTHING that I can think of and I can't play on anything other than low setting's. even then I get these jitters. It's like it can't render fast enough or something. I can't figure it out. Yes, I have even tried all this without the same Audio device in the machine and it still does it. My GPU is on IRQ 16 and is not shared. Mouse driver's installed. Current PC Spec's. //CPU: P4 3.2 Northwood "F" Family //Mobo: Asus P4C800-E Deluxe //GPU: 6800 Ultra (again) //Cooling: Zalman RST1 Water cooled //RAM: Corsair TwinX 1024x4000 DDR (Dual Channel - Linear) //PSU: Antec Neo 480W //HD's: WD SATA Raptor 74G, Maxtor PATA Ultra DMA 250G //Audio: Audigy 2 ZS Plat. Pro //Display: 42" Panasonic Plasma 800x600@70Hz, 19" IBM CRT 1024x768@85Hz Arp size is 256 (Highest setting for mobo tried lower -made no difference) AGP Latency 248 (Have set it to 128 and lower - made no difference) Driver ver. 75.90 (Tried them all - made no difference in my issue) FW Enabled (Disabled - made no difference) SB Enabled (No Option to disable - could not force off w/ Rivatuner) This has got to be the strangest thing I have ever encountered. I need this to be corrected just becuase of the amount of money I have into this thing. I am ready to send the hole dam machine to nVidia and have them figure this out. I wish I could do that anyway. I have not tried any ATi cards in this machine. I am the only Gamer/PC buff in my network of friends and I dont really want to buy another peice of hardware for this thing. Any idea's guys? Dumb question I know because I have covered just about everything I can and most of you can think of. But maybe there's a slight chance that someone know of this.