Another question on FSB and Multiplyer

[Tarmenion]

Hello again

Hoping someone could help me here, I don't quite understand how FSB and the multiplyer work in BIOS to get the proper speed for my new mobo and cpu.

I am using the Asus A7N8X mobo, 2500+ Barton and 2 x Corsair 512mb Pc3200 Xms 2.0cl. Unfortunately I will not get my memory till tomorrow so just 1x Crucial PC 2100 256mb for now.

As mention in another threade I am having problems that I plan on working on tonight but before I shut down my PC after installing the mobo last night the FSB was at 100 with a multiplyer of 11, I know this can not be correct. (I think)

So wondering what should it be, FSB 333mhz x muliplyer 11? Wouldn't that make it 3.663 ? That doesn't sound right.

Could someone explain this to me please and what the proper settings would be without overclocking. I would like to understand how it works and a formula but a not so complicated formula

Thanks in advance

[andyms18a]

hi Tarmenion
The 2500+ runs at 11x166 (1.83GHz),
check out this link http://www.viperlair.com/reviews/cpu...p/xp2500.shtml

[nlawalker]

Remember, that 333 FSB is actually 166. The reason that in practice it comes out to 333 is because you are using DDR (Double Data Rate) RAM. Since information is transmitted from DDR twice on each clock cycle, it effectively doubles the FSB. However, the FSB you should actually select for a Barton 2500 is 166.

Also, if you didn't know, the 2500+ is something of a misnomer. It is meant to indicate that it will perform on par with an Intel running at 2.5 ghz, but because of AMD's architecture, the clock speed isn't actually that fast. A 2500 runs at 1830 mhz. 1830 divided by 166 is 11, your proper multiplier.

Your barton should run at 166fsb x 11multiplier = 1830 mhz. Anything more is overclocking. You may notice that 166x11 is actually 1826... most motherboards have a decimal or a fraction in there somewhere, but it won't say so in the BIOS. 166x11 is right.

NW

[Tarmenion]

Thank you very much.

So lets say hypothetically, I did do 333 on FSB with a muliplyer of 11, would that be considered overclocking to 3.67mhz? And is that a severe Overclock?

Just trying to get a better understanding of it, I will go check that link now Andy provided for me.

[reboot]

You won't even get a boot if you try setting it that high. It's a radically severe overclock. As in double...
FYI, computers base all their FSB's on a multiple of 33.333333~mhz, thus the 1830 mhz is REALLY 166.66666~ x 11=1832.66666~ rounded to 1833.

[minsonngo]

If you increase the FSB, multiplier, or voltages to anything above what the processor is rated for then that would be considered overclocking. Overclocking is dangerous and should be taken in small steps. Basically you just play with the FSB, multiplier, and voltages step by step until you reach your goal. If the system is unstable after you increased then the FSB, multiplier, or voltages to a certain amount then you lower or play around with the numbers until you have a stable system. Before you overclock you need to consider if you have adequate cooling to your system, especially the processor and video card and make sure you know what you are doing. Good luck!

[Tarmenion]

Thanks a lot for the information guys.