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P4T-E w/ 2.8ghz problem

  • CPUs
  • BIOS
  • Processors
Last response: in CPUs
December 27, 2002 12:47:19 AM

ok heres my dilema.

I have a ASUS P4T-E MB with the i850 chipset updated to bios version 1007.

I received a P4 2.8ghz Northwood processor with 533mhz FSB for xmas.

the problem is i put the processor in and the bios only reads it as 2.1 ghz.

This was in Jumperfree mode.

I then switched to Jumper mode and changed the DIP switch.

I set the FSB to 100mhz and the clock multiplier to 24.0x, which would make it 2.4ghz, but to no avail it didn't do squat, MB still says 2100mhz(2.1ghz)

I think my DIP switch is toast.

does anyone know how to get it to read 2800mhz(2.8ghz).

Thanks very much if anyone can answer this.

More about : p4t 8ghz problem

December 27, 2002 1:27:00 AM


Outsider he don't detect the 2.8 Ghz. You have certainty that the processor belongs to 2.8 Ghz?

If yes, mind you that the Intel's processors are locked in the factory. But you should know the FSB and Multiplier of the processor of 2.8 Ghz. But i don't know which the FSB x Multiplier of the 2.8 Ghz. Sorry me.

Too is possible that your ASUS P4T-E not support processor's of cloks above 2.1 Ghz. Check this.

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December 27, 2002 4:04:21 AM

Yep, you cannot change the multiplier on a retail P4 - all you can adjust is the FSB. The chip is a 533Mhz part, therefore you should set the FSB to 133 (133*4=533ish).

This will give your 133FSB and 21 multiplier a nice proper 2.8Ghz system!

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December 27, 2002 4:16:58 AM

These guys are right, you're wrong. Every production Intel CPU since the PII 350 has had a locked multiplier. You can't change it. And worst, your board doesn't even officially support the faster "533" bus, which is actually 133MHz. However your board probably allows you to "overclock" to 133MHz bus speed, you see as previously stated, you have a 21x multiplier, 21x100=2100, 21x133=2800.

I certainly hope you at least have PC800 in there, because in order to get that kind of overclock you'll probably have to set the board to the PC600 setting.

And there's some more computer match for you: PC800 runs at 4x100 or 3x133. That's right, PC800 runs at 400MHz. The PC800 setting for your board is actually a 4x multiple of the bus speed, the PC600 setting is actually a 3x multiple of the bus speed. So the PC600 setting when "overclocked" to 133MHz will give you a PC800 memory speed in actuality.

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December 27, 2002 9:22:57 PM

thnx crashman that worked, im now running at 2800mhz with a 399mhz FSB, thats fine by me, thanx a bunch to everyone else who took the time to reply to this post, i posted over at and no one their gave solution, im stickin wit this site. thank you all very much.
December 27, 2002 9:37:32 PM

How exactly can you run that chip at 400MHZ FSB?!
There is no 2.8 at 400MHZ!
If you actually OCed and are using an 800MHZ FSB that's even scarier.

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December 27, 2002 10:24:05 PM

I think maybe he's refering to his memory speed at 3x133.

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December 28, 2002 9:25:16 PM

yes, im using the PC600 FSB 3x133.