Prob o/c'ing Cel 633 -> 950

[virtuamike]

I'm running into stability probs but I'm not sure if it's CPU or if it's video card. My system boots to W2K fine, ran Sandra burn-in (supposed to be 100% CPU load) and it looks ok. I can run the Q3A demo fine. But if I play the system resets after about 1 minute. Same thing w/ UT. Running CPU at 1.95V, not too stable at 1.90V. Runs a little hot, being cooled by a GOrb. Using GF2 GTS, DirectX8 and 7.17 drivers.

My question is whether or not this is CPU related or a prob w/ the video card (drivers???). I ran a GF2 MX before, never had a prob. Any help would be greatly appreciated.

 

[mechwarrior]

I had a Cel 633@950, 1.75 volts running on a ASUS CUSL2, CL GF DDR and Alpha PAL6035. The temps were case 26C and CPU 34C at idle.

What motherboard do you have and what are your temps?

 

[virtuamike]

Also running Asus CUSL2, temps are something like case 28C and cpu 34C w/ probe idle. CPU jumps over 40C when in heavy use, up to 44C I think. Like I said, it's running a little hot.

 

[shiznut123]

I really think its a heat problem. Get some arctic silver or a fop32 and that will probably help. 1.95v is really high for a celly. I suggest lowering it to 1.9.

 

[Blayze]

I have a celeron 633 @ 950 1.75v with a retail intel fan! although it gets a little warm.

currently running it at 633 until I get better cooling

 

[virtuamike]

Ok, looks like it is an overheating prob. I have an Alpha 6035 on the way, some stronger case fans too. Need to get some Arctic Silver next. Any idea on why the CPU temp would jump so high when under high load? Is my GOrb not sitting flush or the compound I'm using just crap?

 

[kponds]

In my opinion, the Gorb does a decent job on C2's up to about 900 Mhz. Once you get to that point, I recommend a better cooler like the FOP32-1 with Arctic Silver. The thermal conductivity of the Gorb is .98, the FOP is .48. Lower is better!!

Also, the 1.95 volts is high, especially with the gorb. Hopefully, the FOP/AS combo will give you the stability you need at lower temps and allow you to drop the core voltage. Let me know if you need a source for either.

 

[ModMan]

A thin copper plate between the cpu and heat sink will also help by dispersing any localized hot spots in the cpu. Both sides of the copper plate and heat sink should be lapped to a near mirror finish and heat sink compound (Artic Silver) applied between all mating surfaces. The copper plate is usually good for an additional 30 - 40 MHz with these Celerons.

 

[mechwarrior]

A friend of mine recently upgraded to a ASUS CUSL2-C. He was having trouble overclocking his PIII 600 with a GOrb. It wouldn't overclock as high as it use to and it was overheating to the 50's under load. He could barely get 800mhz and before it would do 834.

So I pulled off his orb and discovered it was barely in contact with his CPU. Because the capacitors were too close next to the CPU, he had turned the orb so it was off center. Well, we used the stock heatsink since it was the only one available and bingo everything's working.

This may not be your problem because it sounds like your temps are not way out of line. Maybe if you have the stock heatsink, you should give it a try and see if there is any difference.

Good Luck!

 

[virtuamike]

Thanks for all the advice! I ordered an Alpha 6035 and some Arctic Silver, hoping to get it here by Friday. I thought about the copper shim, would that really make a difference? Only reason I ask is because I thought it's the dye that generates all the heat, so wouldn't that mean the rest of the CPU doesn't run all that hot? Just curious, found a place last night that sells them so I can try that too if all else fails.

 

[ModMan]

The copper shim (the one with a cutout for the cpu core) is to help insure the heatsink fits flush on the core.

The copper plate (no cutout) is positioned between the cpu core (the "dyed part&quot and the heat sink. These plates can be cut from copper stock obtained from the hardware/hobby store.

 

[XzeroR3]

just for comparison

abit bh6 celeron 566@950 1.8

 

[Instigator]

bump

 

[virtuamike]

Ok, I put in the Alpha and the 2 new case fans. Still waiting on the Arctic Silver, using Alpha thermal grease for now. Loud as hell but it looks like it's cooled down some. CPU 32C and MB 28C idle, CPU 40C under max load for 5 minutes. Dropped the voltage down to 1.85V too. I still can't play Q3A or UT w/o them crashing on me though. Starting to think it's a video card prob, what do you guys think? Or do you still think it's overheating?

 

[virtuamike]

I feel like an idiot. Did the most obvious thing, clocked back down to 633 and ran Q3A, just to see if in fact it was the video card. Ran fine, so it's definately a CPU prob. Would a shim help any?

 

[virtuamike]

Any more ideas?