Underclock?

Marunad · October 23rd, 2002, 01:22 AM

I've got a Celery 900 FCPGA and a Soyo MB that'll support up to an 800. Other than not getting all the bang out of the cpu possible, are there any obvious problems 'underclocking' this?

*edit*

MB is a Soyo 7VCA-E Socket 370 that'll take a PIII at 933 w/100fsb or a Celery w/66fsb. Do I risk something unforseen popping in my Celery and cranking to the 100fsb?

Brainchild · October 23rd, 2002, 01:35 AM

HMM! I'm running two socket7 boards that only support 233mhz CPUS, but I'm running k6/2 450s in both @400mhz, haven't had a problem yet, other than initial jumper configs and things like that.

I'd say you'll be alright.

I'd wait on someone with more experiance in this area before ya toss it in there though

jkrohn · October 23rd, 2002, 01:49 AM

Hardware wise there should be no problem.

As long as they are the same pins (ie... Socket 7 to Socket 7), the motherboard could care less who is in there.

It may have a problem auto-detecting the chip, but nothing a few jumpers won't fix.

The chip also will not car ethat it is running "slow". All it cares about is doing its job every time the clock hits it

Jkrohn

Ultima · October 23rd, 2002, 01:52 AM

I hope that it'll see it as a 900 for ya, cause we're talking Intel here.

It's not like you can just rejumper so it'll run 800.

Those babies are multiplier locked remember??

jkrohn · October 23rd, 2002, 02:00 AM

Yeah, tis true.

What model is the mobo? You have to use the 9X multiplier, so hopefully your mobo supports it

Though wouldn't it still run at 8X100? The processor shouldn't care.

Jkrohn

JayMan · October 23rd, 2002, 02:03 AM

I'm with ultima.... with the CPU being multiplyer locked, so i'm thinking it should work at full speed.....

JayMan

jkrohn · October 23rd, 2002, 02:28 AM

Hmm, it should work.

As long as the mobo hits it at 100MHz, it should do 9x the calculations. Processor isn't going to care.

I'm just wondering if not supporting a 9x multiplier might cause some issues anyway.

Best case, reports speed as 800, runs like 900.
Worst case it doesn't boot.

Jkrohn

Marunad · October 23rd, 2002, 08:28 AM

Thanks for all the responses! The MB in question is a Soyo 7VCA-E Socket 370/VIA/ATA100/ATX. At $36 and change each on KnowledgeMicro it was irresistable as backbone for rebuilding some old boxes for office use.

Marunad · November 9th, 2002, 11:59 AM

Works smooth as silk and rock stable... This little workhorse should be crunching our documents for years to come at pennies, thanks for the input all