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P4 2.66Ghz running only at 2Ghz

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First post, by vladstamate

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I have a P4 2.66Ghz on this motherboard. For some reason I cannot run it at 2.66Ghz only at 2Ghz. The BIOS at boot and CPUZ say 20x and DRAM frequency is 100Mhz. Now I tried changing it in the BIOS to 133 (so that 20x would give me my 2.66Ghz) but that did not change anything.

Is that because I have the wrong memory installed? What memory do I need to have 133Mhz frequency honored?

FSB is 400Mhz reported by CPUZ.

I'll post in the morning the CPUZ screen with the memory/motherboard/cpu tabs.

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Reply 1 of 9, by Imperious

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You need to set the CPU FSB to 133mhz. If you have 133mhz sdram then that can run at that speed too.
Most motherboards in this era allowed the CPU FSB and RAM speed to be set differently.

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Reply 2 of 9, by vladstamate

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I think I did that, but no change. Here are relevant screenshots:

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  • IMG_0017.jpg
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    Boot up image (only 2Ghz)
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  • IMG_0015.jpg
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    BIOS:I can choose between 100/100 and 100/133
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Reply 3 of 9, by vladstamate

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Ok, so if I understand correctly, I should be able to set "CPU/DRAM Speed" in the BIOS to 133/133. However the only thing the BIOS lets me set is either "100/100" or "100/133".

Does that mean that it is a limitation in the motherboard? The website for it (which I linked in OP) does not mention anything about 100 or 133 just that it can do either 400 or 533 FSB.

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Reply 4 of 9, by emosun

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vladstamate wrote:

Ok, so if I understand correctly, I should be able to set "CPU/DRAM Speed" in the BIOS to 133/133. However the only thing the BIOS lets me set is either "100/100" or "100/133".

Does that mean that it is a limitation in the motherboard? The website for it (which I linked in OP) does not mention anything about 100 or 133 just that it can do either 400 or 533 FSB.

i used to have a gateway board that had this same pentium 4 2ghz limit.

Reply 5 of 9, by vladstamate

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I've ordered an ASUS P4B266 which according to the manual should support a CPU FSB from 100 to 200.

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Reply 6 of 9, by meljor

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''Cpu frequency'' should be changed from 100 tom 133 in that same bios section. If that cannot be changed maybe there is a jumper for 133mhz fsb operation on the board somewhere?

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Reply 7 of 9, by lazibayer

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If you decide to ditch the board, you may take off the heatsink and check the north bridge chip as well. SiS 650GX added support for 533 FSB since B0 revision, while earlier revisions such as AA only supports 400 FSB. I would check that anyway because I don't trust the PCChips brand.

Reply 8 of 9, by SPBHM

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vladstamate wrote:

I've ordered an ASUS P4B266 which according to the manual should support a CPU FSB from 100 to 200.

this board should be fine, but I doubt it can run at 200 reliably, the manual only tells you that you can set 200 on the bios, but the chipset was designed for 133 max, still you should be able to OC it over 160 fairly easily (if the multiplier is low enough not to hit the CPU limit) going by my p4pe which is like an updated version of this board I think.

Reply 9 of 9, by fitzpatr

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vladstamate wrote:

I've ordered an ASUS P4B266 which according to the manual should support a CPU FSB from 100 to 200.

Does that mean that you are replacing this motherboard?

Or are you saying that this motherboard that you are experiencing the problem is a P4B-266?

If not, which motherboard model are we dealing with here?

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