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CPU speed?


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#1 exxon007

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Posted 19 May 2007 - 12:32 PM

I built a new system, to me anyway, with some used parts but kind of confuse on the CPU speed. The computer said 2.8ghz but in BIOS there are only 3 option in cpu speed field, 1400mhz, 1866mhz and manual. It said I need to be in jumperfree mode in order to change it to manual or something. The multiplier is locked at 14x. I never mess with clocking before so I got no idea what the heck I'm doing. Shouldn't my cpu speed be at 2800mhz? maybe someone can help?

#2 tominorlando

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Posted 19 May 2007 - 06:11 PM

Check the book that came with the motherboard to see what clock speeds it supports.

It should tell you which pins the jumper should be on.

#3 exxon007

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Posted 19 May 2007 - 08:11 PM

manual said support up to 3.06ghz. doesn't say anything about how to enter jumperfree, piece of junk! anybody else?

#4 yoni5002

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Posted 19 May 2007 - 08:35 PM

manual said support up to 3.06ghz. doesn't say anything about how to enter jumperfree, piece of junk! anybody else?


Your motherboard should have a 2 or 3 pin jumper next to the RAM slots (most of the time)

In order to change your Bios conf you may need to either jump it to the right pins or remove it until you make your Bios conf changes as your manual states...

Double check and let us know

Edited by yoni5002, 19 May 2007 - 09:00 PM.


#5 Milenko

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Posted 19 May 2007 - 09:20 PM

Are you sure you aren't using an AMD processor with a 2800+ PR rating?

By the way, with the multiplier locked at 14, if your FSB is 200, then that'll be a 2800 mhz cpu speed.

Edited by Milenko, 19 May 2007 - 09:21 PM.


#6 exxon007

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Posted 19 May 2007 - 09:34 PM

checked. no jumperfree near RAM or anywhere. got a quick question. when I set the cpu speed to 1400mhz, its external frequency at 100/33, at 1866mhz it's 133/33 and in [manual] mode the highest I can set is 166/33. does this mean 166/33 is 2800mhz? I don't want to overclock it just use it to the max. so there are 3 selections in cpu speed option:

1400mhz----100/33
1866mhz----133/33
manual-----highest is 166/33

don't know how to interpret that.

processor is socket 478 northwood p4 2.8ghz 533mhz front side bus

Edited by exxon007, 19 May 2007 - 11:11 PM.


#7 Milenko

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Posted 20 May 2007 - 01:20 AM

checked. no jumperfree near RAM or anywhere. got a quick question. when I set the cpu speed to 1400mhz, its external frequency at 100/33, at 1866mhz it's 133/33 and in [manual] mode the highest I can set is 166/33. does this mean 166/33 is 2800mhz? I don't want to overclock it just use it to the max. so there are 3 selections in cpu speed option:

1400mhz----100/33
1866mhz----133/33
manual-----highest is 166/33

don't know how to interpret that.

processor is socket 478 northwood p4 2.8ghz 533mhz front side bus

Alright. With it being a P4, take the 533 and divide that by 4, you get the 133 before it's multiplied out, so 14 x 133 = 1866. Now, if you went with the 166/33, then your CPU would be running at 2.33 Ghz. What is the speed of the Ram in the system, and what motherboard are you using? You may be able to manually setup the 200/33, but we want to know the limitations of the rest of your components so you don't fry anything.

#8 exxon007

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Posted 20 May 2007 - 02:20 AM

I'm using ddr400 or pc3200 but motherboard (asus p4s8x-x) can only take ddr333 or pc2700 but it works so.....I only want to take it up to its' max (2.8ghz), don't want to overclock it.

correction: processor is 800mhz front side bus but motherboard can only do 400/533mhz front side bus.

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