Problems overclocking my Celeron 566

[rharbin]

I want to overclock my processor to 850. I have read several articles and I have a motherboard (Soyo 7VCA) that should make this pretty straightforward. My first attempt was to change the CPU/PCI frequency from the ?HW Default? value (which is, I assume 66/33) to 100/33. I restarted the PC and I can?t get it to even boot to the A drive or the (Award) BIOS screen. I plan to reset the CMOS using the jumper on the board. My question is ? what next?

The BIOS offers about 30 frequency settings starting at 66/33 and going up to ????. A few of the increments are:
66/33
68/34
75/37 etc. up to
100/33
103/34
105/35 etc. up to
133/33
135/33 etc. up to 166/41

The voltage settings are:
Normal ? current setting of 1.56V
+1.5%
+3%
+4.5% etc. up to
+10%
These equate to voltages ranging from 1.56V to 1.72 volts

After I reset the cmos and am able to get back to my BIOS screen, should I leave the frequency where I have it and begin increasing the voltage? One step at a time? If I get to a voltage, at which the machine boots, should I leave it there for a while to ensure it is stable or should I jack it up one more setting? I know temperature is a concern. The processor was running at about 102 deg. F. What temperature should concern me as being too high?
Thanks in advance for your advice. Ron

 

[pawkz1k]

Hi,

I did the same thing to my Celeron 533a. I simply set the FSB to 100MHz. Since this is a standared FSB clock rate, there should be no issues with the PCI bus speed. The PCI speed should be 33MHz as you indicated. BTW, I used the default CPU voltage setting w/o problems.

One thing...you are using PC100 SDRAM aren't you. You did not say so in your post. So, if you are using PC66 SDRAM, that could be the cause of the failure to boot up. If you are using PC100, well, never mind ...

Paul W.

 

[littletemple]

I'm trying to overclock my 800 celeron. I don't know if I even can since its an Hewlett Packard. The mobo is an asus cuw-am/mew-am. The fsb is at 66 and I can't change that, and there is no multiplier. Is there a program out there to let me change the fsb? Or am I SOL?

 

[rogue1979]

Put it straight to 1.72v and see if you can boot and run stable at a 100MHz fsb, make sure you have a decent heatsink/fan. If you are running stable slowly turn down the voltage as far as you can, but usually the 566@850 takes 1.70-1.75v to be stable.

 

[rharbin]

I'm using PC 133 SDRAM got that for going to a P3 eventually. I assume it will run fine at 100/33.

I'll up the voltage and report back. Thanks. Ron