AMD Semperon 2800 registering as a 2400+

[hoyboy]

I have just purchased a AMD Semperon 2800 chip, and put it into my soltek sl-75fen2-L. It seems to work fine, except that in XP it was showing as a 1900+ at 133 fsb. I upped the fsb to 166 and it took it to a 2400+, but raising the fsb further dosen't up the rating, just the Ghz. it's up to 2.10 ghz at the moment, but I really don't want to push it any further at the moment. Any ideas would be much appreciated.

[Cobra]

The Sempron 2800 should run at 2084MHz (166 x 12.5). This is assuming that it is the same clock specification as the Athlon XP2800 it replaced.

Your settings at correct. If you want to push it further (overclock it, voids warranty but gives more speed) then see my signature and do a little research on the Internet.

Cobra

EDIT - Run CPU-Z on your machine and it will display all your CPU/Motherboard/RAM/System details so you can confirm what I just said. It is free and stand-alone. Run a Google search and you'll get it no problem.

[Faustus]

Could it be possible your board was built before the Sempron and needs a bios update to ID it properly?

[glockjs]

semp has a lower fsb than xp...i'd check in bios and see what that shows...if it's still wrong update bios like flaystus said

[Cobra]

I often find that my CPUs are recognised by a motherboard as a lower model. I don't know why - maybe it is a BIOS update.

glockjs - Semprons use a 333MHz FSB, so it is set to 166 in BIOS. Shame - I loved the Athlon XPs that used the 400MHz (200MHz) FSB. Nothing to say that a Sempron can't hit that with a bit of tweaking!

[glockjs]

nevermind i was thinkin of the mobile barton

[hoyboy]

thanks to everybody who helped me out on this question. I am starting to thing it may be the m/board being a little bit older than the processor. I might look at upgrading the bios later but it is running pretty sweet at the moment so I might just leave it for a while.

[redwudz]

If I have the right MB (Soltek SL-75FRN2-L), here's an article that might give you a few ideas: http://www.hardocp.com/article.html?art=NDY4

I've had good luck with OCing Sempron CPUs. I have 3 motherboards running with Sempron 2200s at a 400Mhz bus speed. Very stable and minimal heat increases.

This makes the CPU look like a 2800 Sempron to the MB. Dual channel DDR3200 memory helps a lot. The only change I made was the FSB setting. No voltage or other changes needed. One has 256MB memory and runs at 1800Mhz and the other 2 have 512MB dual channel and run at 1900Mhz with a 9.5 multiplier.