AMDxp 2800 cpu not up to speed

I have just fitted a new mobo Asus A7N8X Deluxe and AMDxp2800. The board came with cpu and ram already fitted to it. It is only running at 2083mhz when I think it should be running at about 2240mhz. The fsb in the bios is set to 166 and multiplier automatically sets to 12.5, I believe the multiplier should be 13.5 for the 2800xp but if I change it to 13.5 then it only runs at 916mhz it doesn't make sense to me as 166x13.5=2241. I thought it might have been a temperature issue it was running at 49c so I have put in a larger heatsink and fan and is now running at 40c. Can anyone help please.

 

I'm strictly an Intel user here but according to this review:

http://www.xbitlabs.com/articles/cpu/display/athlonxp-3000.html

It sounds like you have the Barton XP2800 version which has a default multiplier of 12.5 and an L2 cache of 512 KB
The older Thoroughbred version XP2800 has a multiplier of 13.5 and an L2 cache of 256 KB.
As far as the 916 MHz is concerned, it sounds to me that your motherboard is defaulting back to a 66MHz FSB (916/13.5=67.85 MHz) which is well within normal clock crystal tolerance (2.85%)

Bottom line, if indeed you have the Barton version, it seems to be performing normal.

Perhaps some of the AMD hardware champions could offer advice in addition to my comments.

Daddad

 

Thanks Pete, you beat me by 5 minutes
I can't type as fast as you

Daddad

 

Thanks Petec and daddad for the info it looks like I am running at full speed after all I'm quite happy now. Cheers.

 

You can also try taking your front side bus to 200 mhz - if your memory can handle it. Thats how most are getting 3200+ performance out of a 2500+ Barton. Might require bumping your core voltage too.