im still fairly new to ocing but, here we go ive figured out from what ive hear the a7v600 mb isnt the best for oc cos of the lack of a pci apg bus lock, bad luck but cant afford anthing newer at mo and would prop go for a amd64 in near future My mb can raise the bus to 250 but after 200 the pci.agp devider starts to jump from 34,35,36,37 etc every 5 or so steps in bus speed. Ive curently got my barton 2500m xp chip running really solid at 212/34 at about 1.60 volts no probs, but im a bit wary of taking it above the 34 devider. I saw the other day a guy on another forum with same mb got to 230 bus @1.9v, pci=39 agp 76. http://forums.extremeoverclocking.com/showthread.php?t=157818 Thats where i would like to get to. lol so my question is really is there any bios mods to get my bus higher without the devider going up ? And what is a reasonable level to take it to ie 37,38 39 etc... Whats likly to happen if it all goes wrong will it fry my hard drive, cards, ram etc.... Is it a case of stabilising the system with cooling and extra vcore to keep things goin at higher bus speeds..... ASUS A7V600 1024 PC 3200 DDR XFX 6600GT XP BARTON-M 2500 80 GIG SATA+IDE 400W PSU

I use 37.5MHz as the safe max for the PCI bus. AGP would be double that, or 75MHz. If you go higher than 38MHz, you run the risk of problems with AGP & PCI cards, & data corruption with IDE HDDs. You may also encounter problems when burning with IDE optical drives. You should have no problems with where your settings are right now, & I wouldn't be afraid to push it a little higher...225MHz should be the max though, as it will put the PCI at 37.5MHz Asus A7N8X-X 1800+ @ 8 x 210MHz 512MB PC3200 Asus Ti4800SE 128MB WinME/WinXP Pro

I was able to run my 8K3A+ (KT333 1/5 divisor) to 209 (with the resulting 42 MHz PCI bus). I ran it at that speed for close to a year with no problems. It actually ran fine up to 215 FSB, with the exception of the CDRW. Anything over 209, and the PCI was too high for it to burn sucessfully. So I kept it at 209, and I had no problems. If you have a Radeon video card, you will not be able to reach these speeds. Radeons are known for not tolerating out of spec AGP speeds. My understanding is that the low 70s is the limit for Radeon cards.

Ok, just read your specs, no problems on the video card. Only way to know for sure what your components can do is to experiment. I'd listened to many naysayers about high PCI speeds for quite a while. Then I bought some HyperX PC2700, and decided to see just how high I could run the FSB on my 8K3A+. Turned out it ran stable at much higher speeds than I would have thought it could before I tried.

I've also seen people blow their $200 gfx card up from too high a bus speed on AGP. Don't be stupid when you OC when PCI and AGP get overclocked, too! "...but in my defense, it was dark, I was drunk, and it was delicious!"

Where have you seen this? How high did it blow? I've heard of video cards not working because of out of spec AGP bus speeds, but I've never heard of one being damaged by it. That isn't to say it doesn't happen, but this would be the first report I've heard. My TI4200 worked well at 84 MHz AGP. All I can tell you is my own experience.

Buddy of mine fried his card at 85MHz AGP bus, but it was before the Ti4200 series cards. I want to say it was a Geforce 3 Ti, but I honestly can't remember. The others I don't know the specifics, so they could have done something stupid like 100MHz for all I know. LOL. I just know one friend of mine fried a 9800 pro that way, the other one I don't know any details. "...but in my defense, it was dark, I was drunk, and it was delicious!"