How to overclock a Celeron 900?

[hagbard]

I'd like to run my C900 at 133/133, I can do 100/133 but not 133/133. I'm using a cheapy Asus TUSI-M board. Any ideas how to go about overclocking this thing? My Pentium III system, a P650 has no trouble overclocking at 133/133 to 870Mhz, just can't figure out how to do the same with this Celeron.

 

[bacillus]

have you tried upping the vcore?

 

[hagbard]

Doesn't appear to be an option for that with this board.

 

[EKAtBzboyz]

Originally posted by: hagbard
Doesn't appear to be an option for that with this board.

without that you are probably going to get nowhere, maybe a slight overclock...

look in the manual for jumpers, usually asus has voltage adjustments in bios and onboard thru jumpers

//edit
was the p3 on the same board??
and you got it to the overclocked speed with no voltage adjustment?

 

[hagbard]

Yeah, all the Asus boards I've had before have had the ability to adjust voltage, not this one. And no, the PIII is on a CUSL2-c, and works fine at the standard voltage.

 

[rogue1979]

While some Celeron 900's reach a 133MHz fsb for 1200MHz, many will not. At any rate if you don't raise the core voltage you won't have any chance. I looked at the Intel Data sheets a long time ago for the coppermine processor, and there is a way to use the wire trick to reach 1.90v. I don't have the info anymore, but it is out there.

 

[bizmark]

I've got an 850MHz Celeron that o/c'd just fine to 133FSB (1133MHz) but I'm now running it at 986 because it lost stability when the weather got warmer Anyway my mobo is cheap (PC Chips :Q) and the only o/c option it had was to force the 133FSB with a jumper selection. That is, until I upgraded to the bios for the ECS DV6AA (same board, different bios) and that allowed me greater FSB selection. I didn't have to do anything to the vcore.... the automatic vcore sensing of the motherboard handled it fine, but it mostly stayed at stock voltage and occasionally went up by 0.05V. But I guess it mostly depends on your motherboard *shrug*

 

[Tab]

How did you get your 850 Celly so high?!?!!? I have a 850Mhz Celeron right now at default speeds on a intel mobo of somesort.

 

[bizmark]

Originally posted by: Tabb
How did you get your 850 Celly so high?!?!!? I have a 850Mhz Celeron right now at default speeds on a intel mobo of somesort.

I'm not sure, I guess I got lucky It was my first attempt at overclocking, and in fact the first computer I built myself. I've got a cheap PC Chips dual-processor mobo (M790MR) whose only o/c option was to force 133FSB. (It's the twin of the ECS D6VAA reviewed here. However, the BIOS on the PC Chips is not the one in the article.... no o/c'ing options. (in fact it was AMI instead of Award) So lately I got ambitious and flashed the PC Chips BIOS to the version 1.0 Award BIOS linked in that article. It works ) So anyway, when I got the board I was kinda miffed that I couldn't go to an intermediate o/c, but I decided hey, what the hell, I'll try it. So I switched the jumper and voilá, it booted up at 1133MHz (actually 1138 ) and seemed to run perfectly. (of course I'm using PC133 RAM and the motherboard obviously supports 133MHz FSB) I did all of the torture tests I could find -- Sandra burn-in, Prime95, looping 3DMark demo. It ran all of them perfectly well My motherboard had NO provisions for vcore adjustment (it did it automatically) but every time I looked it was either stock or 0.05V higher.

This was last winter, in January I think. So the CPU is probably one of the latest steppings of this chip. I bought the CPU from NewEgg BTW, and it's OEM so I bought the $5 CoolerMaster HSF and some basic thermal goop. Anyway, I was very pleased with the performance of the chip, but then when it started to get warmer the machine started hanging (my room is pretty drafty in winter). So I had to de-o/c it back to 850 speed. (This was all in the POS $21 CompGeeks case with NO FANS besides the PSU fan BTW)

Recently I bought a new case (Chieftec 1030) and I decided to try and flash the BIOS even though it's actually intended for another motherboard. So anyway, it worked and now I'm happy @ 986MHz and I'm contemplating returning to the 1133MHz speed