a friend of mine has a pentium III 1.3 with an fsb of 133 Mhz. I think my board (a trigem cognac) can only run at 100 mhz unless i use a software overclocking program. can i still use this processor? the board supports it, it's socket 370, just not the fsb.

According to this site, the Cognac only runs 66MHz FSB 370 CPUs - Intel Celeron 300/333/366/400/433/466/500MHz.

What CPU are you running in that board right now?

http://www.elhvb.com/mboards/TriGem/profile/

This site tells it a little differently, but still says it's only a 66MHz FSB board:

http://www.donovansmith.us/node/2

Asus A7N8X-X
1800+ @ 8 x 210MHz
768MB PC3200
Asus A9550 128MB/128-bit
Gamer Edition
WinME/WinXP Pro

I'm pretty sure anything with the Intel 810 chipset will run either 66Mhz or 100Mhz, but it chooses what frequency to run at based on the prcessor default (intel's locking bull). Right now i'm running a Celeron 566, but i can overclock it with CPUcool to run at around 700MHz with no problems.

If the board would switch over to 100Mhz, a 1.3 GHz processor would run at 1 gHz, right? i'm assuming that you can use a 133Mhz fsb processor at a lower fsb setting, ie 100Mhz.

You need to confirm the 1.3 is not a taulatin core. If it is it will most definately not work without some kind of adaptor. While they are both socket 370 and will fit, your cpu is a PGA type and the taulatin is an FC-PGA. They run on two different core voltages. If you just drop the 1.3 in, you will likely burn it out because the 1.7 volts will be too much. (PGA run on 1.7 while FC-PGA run on 1.5)

ASUS P5GD1
P-4 3.4 SOCKET 775 OCed to 3.9
1G Corsaire DDR400
ATI RX700XL 256MB PCI-E

Just for clarification, the tualatin core is a FCPGA2 while the coppermine core is a FCPGA, but hapeekrapee is correct. You can not run a tualatin core with that motherboard. I have managed, through extensive research that that fastest CPU that will work on the cognac is a PIII 1.13GHz 100FSB. And yes, the board automatically detects the FSB of the chip.

I believe that the 1.3GHz CPU you're talking about is a tualatin core, so no, it would not work unless you get a FCPGA to FCPGA2 adapter.

The best upgrade for this motherboard is up your ram to 512MB (2x256MB, unbuffered/non-ecc/low-density). I know in the manuals out there, that only 256MB max is supported, but believe me, 512MB runs fine in my box. But make sure that it's low-density!

Here's a site that should come in handy http://www.e4allinc.info/ for us cognac owners.