Need help overclocking a celeron 300a.

[zmzhang]

I just installed a celeron 300a and I decided to overclock it. I raised the bus speed from 66mhz to 83mhz and it posted. But when it started to load windows, it stalled several times. I decided to lower it to 75mhz and it is stable. How would i get it so that it runs at 83mhz? Do I need to raise the voltage? I have a Space Walker HOT-637 version 2. How would i raise the voltage on the mother board?

 

[lepper boy]

Wow, where'd ya get the 300a??

and just up the voltage... this cpu been used before? and about the mobo.... look it up.... I would but I've just had one HELL of a day...... so I'm not going to.....

 

[zmzhang]

Sorry to hear that you are having a bad day. Is the 300a that good? The motherboard is the one that i used with my 266mhz, I got the 300a (slightly used) from someone overthe internet. It doesn't say how to raise the voltage in the instructions. Does anyone know how to do this?

 

[Turbopit]

What kind of heat sink and fan do you have on it? You need better cooling than stock with higher voltage and speeds.


btw, my 300a I just replaced with two p3 700's@1050 was running at 504 for 3 years. It will go into a small server soon.

 

[WarCon]

Get a free temp program, and check your temp. Also are you running pc100 memory? Most of that older Sdram (PC66) wasn't able to go very far past 66mhz. Have you tried changing your multiplier, instead of your fsb speed? No matter what a stock heat sink will rarely let you overclock very far.

 

[SPAnDAU]

There are a few thing to look at first.

1)What motherboard do you have?
2)Do you know if the PCI divider is at 1/2 or 1/3? If it is at 1/2, change it to 1/3.
3)Check the above on you AGP divider, but check to see if it is at 1/1 or 2/3. If it is at 1/1, change it to 2/3.
4)Can you change the cpu (vcore) voltage? It will either be in your bios or a jumper on the motherboard. You may want to bring it up a bit. It's been a long time since I oc'd a 300a, so I can't tell you what the voltage should be.
5)A stock hs/f will work fine getting that cpu up to 450Mhz.

The reason you want to set your PCI divider to 1/3 when you have your fsb at 83 is because you need the PCI bus to be as close as possible to 33Mhz. 83* 1/2 is 41.5, which can really strain your PCI cards.
The AGP bus is specced to run at 66Mhz, so you want your divider to set it as close to 66 as possible.

 

[zmzhang]

Thanks for the responses. i have a space walker hot-637. where can i get a free temp program? how do i find out what my pci and agp divider? I can't seem to find out how to chang my cpu voltage. I have a stock fan on it. I had a stick of pc66 ram, but it has been sitting in my basement.

 

[bigpow]

I've used Celery 300A @450 from the first day.

Sometimes it can't resist 83MHz because the PCI freq. is also rising, making things difficult to withstand for certain peripherals. Try going 100MHz, that way the PCI freq. is still the standard 33MHz.

Good Luck.

 

[zmzhang]

bigpow, thanks for the response. But my motherboard can only support up to 83mhz, I am looking for a good deal to get a new motherboard.

 

[OCNewbie]

I have heard that many hard drive's don't like the 83 MHz front side bus speed. I think that is actually what is causing your stall, your hard drive not liking the bus speed, not heat on the CPU. The CPU would probably run fine at 450 MHz, and so would the hard drive since it's bus speed would be in spec at that CPU speed. I had the same problem with my p2-233 & a 13 gig Maxtor drive, would stall in Win2k at 75 or 83 MHz speed, but fine at 66 MHz speed. But this CPU & mobo. would overclock fine with another Western Digital hard drive I had. Western Digital seem to be ones that tolerate that bus speed nicely. Good luck!

 

[steven185]

yep 83mhz is tough but that cpu will do fine at 100fsb get yourself a cheap bx mobo and you will be all set.
try here
http://www.compgeeks.com/products.asp?cat=MBB

 

[zmzhang]

I have two harddrives. One is a maxtor 5.32(or something) gig (i don't know the speed). The other one is a fajatsu(or how ever you spell it) 2gig 5400 rpm.

 

[OCNewbie]

Well, it's very likely then that your hard drive's are not liking that FSB. I think there are ways around it, like disbaling DMA, etc. But I don't think it's worth it. You might be better off just buying a new, cheap motherboard, and running the CPU @ 450 MHz, 4.5 x 100. You won't regret it.

 

[zmzhang]

Is the 100mhz bus the fastest you can push a celeron 300a? I saw a intel motherboard that supports both celerons and p3s for $36. Is this worth it? It goes up to 100mhz bus for the p2/celeron.

 

[OCNewbie]

Some 300A's will push to the 112 MHz FSB setting (504 MHz), but you might need a better than stock heatsink/fan with it. You should be able to get the 100 MHz + turbo setting to work fine as well (464 MHz). And I have heard that some push up to the 117 MHz FSB (527 MHz). But I'm not sure if you buy a cheapo motherboard you'll have all these choices. But it should most definitely do 450, I'll cross my fingers for ya

 

[dirkdaring]

My celeron 300a is still going at 450 since the day I bought it about 7-8 months after they first came out. I raised the voltage a tad, but besides that didn't change a thing but the fsb to 100. Same stock heat sink/fan, you can't even tell the difference in heat. Radio shack thermal paste. BH6 rev1 board. It's now my wife's machine, I got the overclocked Duron.

Dirk

 

[gplracer]

My celeron ran at 450mhz at 2.0 volts with the stock heatsink/fan. I would get another motherboard. It should run fine at 100mhz fsb. There might be something in your system that does not like to be overclocked. Right now everthing is overclocked. At 100mhz fsb the only thing that will be overclocked will be the cpu. That is if you get a motherboard that supports a 2/3 divider. I used an abit bh6. Maybe you can find another one. good luck

 

[zmzhang]

does anyone know of any good deals on motherboards?