850Mhz T-bird only does 928Mhz, why?

[amdcloud]

I was trying to overclock my 850Mhz AMD Thunderbird and I could only get it up to 928Mhz. When I am in the Bios for the clock setting, I pull up the menu and at the top it says "Clock host/PCI clock" and I had it set at something like 107/37Mhz. So does the 37Mhz mean that the PCI slots are all running at 37Mhz instead of 33Mhz? How can I lock in 33Mhz for the PCI clock because I think my PCI devices are locking up or something. I am running 1.82V on the core. There are dip switches on the motherboard but I'm wondering if they would also change the PCI clock in addition to the CPU, or maybe just change the processor clock. Another question- I have a jumper on the motherboard that switches the FSB speed between 100Mhz(Default) to 133Mhz. I have it set on 133Mhz, but when I moved it to 100Mhz with everything else set to default, the computer wouldn't even post. ? I wouldn't figure a slower speed to make it cease to run like that.

 

[Soulkeeper]

Originally posted by: amdcloud
I was trying to overclock my 850Mhz AMD Thunderbird and I could only get it up to 928Mhz. When I am in the Bios for the clock setting, I pull up the menu and at the top it says "Clock host/PCI clock" and I had it set at something like 107/37Mhz. So does the 37Mhz mean that the PCI slots are all running at 37Mhz instead of 33Mhz? How can I lock in 33Mhz for the PCI clock because I think my PCI devices are locking up or something. I am running 1.82V on the core. There are dip switches on the motherboard but I'm wondering if they would also change the PCI clock in addition to the CPU, or maybe just change the processor clock. Another question- I have a jumper on the motherboard that switches the FSB speed between 100Mhz(Default) to 133Mhz. I have it set on 133Mhz, but when I moved it to 100Mhz with everything else set to default, the computer wouldn't even post. ? I wouldn't figure a slower speed to make it cease to run like that.

it sound like the pci frequency is holding you back
backoff the fsb till the pci is around 35 or so then up the clock mult instead till the chip maxes out
only raise voltage as needed when you notice instability
just go in like .5 mult settings at a time


good luck

 

[amdcloud]

Thanks soulkeeper. I'll give it a try and let you know how it turns out.

 

[amdcloud]

Awwww man..... I think I fried the processor. I was trying to set the dip switches and checking the clock speeds with PCmark but the speed wasn't changing. It's like the CPU wasn't paying any attention to the dip switches, only if I set the speed in the bios. So I set the speed of the ram to 133Mhz because I noticed it was set on 100Mhz for some reason(it's PC133 memory) and then set the latency to Cas2, then I upped the clock frequency, saved the settings, and exited out of the bios. The screen went black and it failed to post. So I cut the computer off, turned the PS switch off and tried to clear the CMOS. Now the computer won't even turn on. I flipped the PS switch back and forth, hit the power button, took the battery and left it out of the motherboard for about 5 minutes and put it back in, everything.... and nothing. So now I really need another processor. Anyone have a Duron processor they want to trade for some PS2 games? Please?

 

[lenjack]

Keep in mind...Overclocking is NOT a sure thing, Some cpu's will not o/c, some will o/c slightly and some will o/c a lot. It's the luck of the draw.

 

[amdcloud]

Well I knew the Thunderbirds weren't the best overclockers and they had the potential to create a good amount of heat, but I didn't expect it to give out so easy...

 

[jjyiz28]

i know im late but i don't believe your cpu is supposed to run at 133 bus. it should be set at 100.

133 x 6.39 = huh??
morelikely
100 x 8.5 = 850mhz.

sorry bout ur cpu. u sure your clear cmos jumper is set to normal when you bootup ur computer?

 

[shimsham]

did you up the voltage on the cpu? if not, i dont think just raising the fsb alone would burn it up. are you sure you are clearing the cmos correctly?

 

[LawrenceHeffernan]

I locked a Duron 850 (in the short time that I had one, after my Athlon 1.33 died) by setting the FSB to 133, so I simple removed the cmos battery, unplugged it, waited a minute. Plugged everything back in again and it worked, and topped out at 950MHz (Multiplier changing only)

 

[Jeff7181]

Yeah that wasn't a good idea... Thunderbirds are not known to be great overclockers.

 

[DivideBYZero]

Originally posted by: Jeff7181
Yeah that wasn't a good idea... Thunderbirds are not known to be great overclockers.

Except the AXIA and the AYHJA which were great.

 

[lenjack]

my 1333 went to 1507 with no problems.

 

[Jeff7181]

Originally posted by: DivideBYZero

Originally posted by: Jeff7181
Yeah that wasn't a good idea... Thunderbirds are not known to be great overclockers.

Except the AXIA and the AYHJA which were great.

Ok... HIS Thunderbird isn't a known great overclocker.