Intel Pentium 4 20% oc possible?

[eyimbo]

dear all,

I'm running a P4 2.8 533fsb, 1mb L2 cache... not sure if it's a presscott or a northwood, but i've managed to overclock it to 3275Mhz, 21.0X156mhz, the bus speed is now 623.8mhz... i tired 158mhz, but without sucess... anyone have anyideas or comments please let me know. oh and i don't think it's the ram that's busting it.

 

[pmr]

Sure that's possible, but with the right and "lucky" cpu, right RAM and right Chipset and Bios. So, the variables are too many to see what's holding your back.

 

[eyimbo]

Sure that's possible, but with the right and "lucky" cpu, right RAM and right Chipset and Bios. So, the variables are too many to see what's holding your back.

oh ok, so it's like a lottery then.... thanx alot.

 

[ChipDeath]

What motherboard have you got? Make sure you can lock the PCI/AGP clocks. That might be what's stopping you.

By default your motherboard probably runs the PCI clock at 1/4 of your FSB. (133/4 = 33Mhz), so at 156Mhz your PCI clock would be at 39Mhz.

Most PCI cards don't like being overclocked (and don't forget, a lot of your on-board stuff will be hooked into the PCI bus, so having no cards doesn't help).

AGP is 66Mhz. 2x PCI.

Your board may have a setting for 166FSB (probably not, since there were no intel chips on that bus, but you never know). This would run PCI at 1/5 of FSB, which would be 31Mhz @ 156, which would probably be fine.

If you can't lock the PCI/AGP bus, and there's no way of slowing it, then it'll stop you for sure.

 

[eyimbo]

What motherboard have you got? Make sure you can lock the PCI/AGP clocks. That might be what's stopping you.

By default your motherboard probably runs the PCI clock at 1/4 of your FSB. (133/4 = 33Mhz), so at 156Mhz your PCI clock would be at 39Mhz.

Most PCI cards don't like being overclocked (and don't forget, a lot of your on-board stuff will be hooked into the PCI bus, so having no cards doesn't help).

AGP is 66Mhz. 2x PCI.

Your board may have a setting for 166FSB (probably not, since there were no intel chips on that bus, but you never know). This would run PCI at 1/5 of FSB, which would be 31Mhz @ 156, which would probably be fine.

If you can't lock the PCI/AGP bus, and there's no way of slowing it, then it'll stop you for sure.

yeppy! 164MhZ!!!!!!

 

[ChipDeath]

Glad to help :mrgreen: