Celeron tualatin bus speed selection

[Bill Kunert]

I have a MSI 694T Pro board which has Tualatin support. I had a PIII-700 running at 1.01 GHz. In order to defeat the bus speed selection and run at 133+ instead of 100+ MHz I had to cut a trace on the board. I just installed a 1.3GHz Celeron and it wouldn't boot. I reconnected the trace and it runs ok up to 115MHz(1.495GHz). Above that I run into agp bus speed problems. Apparently Intel is monitoring the bus speed selection lines for a short period after power on to make sure the lines aren't cut so another means has to be found to force 133MHz as the default processor speed. Anybody got any ideas?
Thanks
Bill

 

[RalfHutter]

1.1A is as close to guaranteed to run 133MHz as you'll get. I've personally never seen one that won't, and the majority will do it on default Vcore.

 

[Bill Kunert]

I appreciate the reply but that really isn't my problem. I need to get the board to see the chip as a 133MHz chip instead of a 100MHz chip. When I use buse speeds available to a 100MHz chip they run from 100 to 132 MHz and the PCI and agp bus speed get too high above 115MHz. If I can run in the 133MHz range my PCI and agp bus speeds are 33 and 66MHz at 133. When I had the PIII I was able to cut a trace on the mother board to force 133MHz and up. The tualatin chips won't allow that procedure and I was hoping there was another way to force the board to see this as a 133MHz chip and not a 100MHz chip.
Bill

 

[RalfHutter]

Oh OK. You need to wrap some of the pins to change the default Vcore. There's a giant thread about this at OCforums in the Intel CPU forum. Make sure you're reading the one for Tualatin Celerons.

You most likely still won't be able to run your 1.3 at 133MHz though. Most won't run that fast, even with a healthy dose of extra Vcore. Best bet for a CPU to do this with is the 1.1A. It's certainly feasable though, lots of people do it.

 

[Kaiser__Sose]

celery tualatins top out at about 1.4 - 1.5 gig.. It's doubtful that that celery 1.3 can run on a 133mhz bus ..

 

[Bill Kunert]

I'm currently running at a bus speed of 120MHz(1560MHz) at 1.6 volts. I tried 125MHz and had to reset my bios 'cause it wouldn't boot. I guess I'll be satisfied with what I'm getting. Thanks for the replies.
Bill