# HELP! 2700+ read as 1500+

Jan 28, 2005
1. Hey all, and thanks for your time, I need some help.

My SL-KT600-C1L is reading my Athlon XP 2700+ as a 1500+ in the bios. I have scoured my manual to make sure this is not a jumper setting but I can't find anything in it relating to it. I'm at the end of my rope--please help me, thnx so much.

2. ### JustinTS RookiePosts: 942

99% chance your FSB is set incorrectly. Make sure it is not set to 100mhz, and is set to the proper clock speed for your cpu (133mhz for athlon t-bred, 166mhz for sempron and barton)

3. ### RickTechSpot StaffPosts: 4,573   +65

It may be just a coincidence, but that would be about right if your CPU requires a 166/333MHz FSB, but your board is only running at 100/200Mhz FSB.

If the CPU was designed to run on a 333Mhz FSB, but your board is set to 200Mhz (as many are, by default), then it would read about 1500+. The formula is FSB x clock multiplier. The clock multiplier determines the speed of the CPU.

Just to show you, here's some math we can apply to show this.

The 2700+ = 2170MHz
The 1500+ = 1350Mhz or so (don't remember exactly)

2170 (speed) / 166 (FSB) = About 13

So from this, we can say the correct multiplier SHOULD be 13 for your CPU. So let's see what happens if we take a CPU with this multiplier and put it on a 100/200Mhz FSB.

Before on 166MHz FSB: 13 x 166 = About 2170
After on 100Mhz FSB: 13 x 100 = About 1300

The numbers aren't exact, but they are probably more than a coincidence. So again, my guess is that you need to set your FSB to 166MHz.

There's a variety of ways to change this on different boards, but most likely it is just a setting in the BIOS a jumper that needs to be changed. It may also be related to your memory, if it is not fast enough for your system. For example, PC3200 runs at 400Mhz. PC2700 is 333MHz, PC2100 is 266MHz and the defunct PC1600 is 200Mhz

If you have any questions, please ask. We'll help you out as much as possible.

4. ### kastraelieTS RookieTopic Starter

OMG, I am such a n00b. Thanks so much for being patient and helping me peeps. My mobo had a wierd box jumper thingie with switches, and it was configured for a 100Mhz instead of 166Mhz. Thank you so much, my problem is solv-ed now.

BTW Rick, Windows RG edt. is so pimp ; )

Thanks again guys!!!

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