Problem getting MB to recognise new CPU

Asus motherboard / A7n266-vm
September 16, 2009 at 00:08:04
Specs: Windows XP, AMD Athlon XP2500+
Hi, help please.
I have upgraded old AMD 1700 CPU to AMD Athlon XP 2500+., but I cannot update Bios to 'see' new CPU and increase speed.
I have successfully update Bios from 1006 to 1007 via Asus website, but in the Bios it is not possible to change the CPU settings, as the model and speed section is 'greyed out'.
I have read on here about checking for jumpers, but on this board the only Bios jumpers are set correctely with the default in position for 133/133 (although the Bios shows 133/33 ????)
I have also tried taking out battery but all that seems to do is erase Bios memeory with regards to time etc.
Please help tell me what I'm doing wrong.
There are no other jumpers to check but I need to increase speed of cpu from the current 1466 showing (which ties in with the old 1700 cpu.
Am I just doing something in the wrong order ??
Thanks
Beanie :(

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#1
September 16, 2009 at 00:29:35
1700+ runs at 133Mhz fsb. 11x multiplier

2500+ runs at 166Mhz fsb. Also 11x multiplier

A7N266 VM supports 100 and 133Mhz fsb; but not 166Mhz fsb.

As I recall, this motherboard is kinda strange concerning BIOS settings. Can you raise the fsb in BIOS?

Bottom line is that your board doesn't support 166Mhz processors. Only thing you did wrong was buy the wrong cpu.

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#2
September 16, 2009 at 00:39:03
don't tamper with the jumpers. you know it's like changing a mother board. you have to reinstall the Os once you have change the processor it self. never did it but it's good to try
Just don't tamper with the jumpers on the mother board alright.
Also you can try to reset the bios by battery reseting method.

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#3
September 16, 2009 at 23:45:30
Hi thanks for replies....most helpful.
The FSB cannot be changed in the Bios - greyed out!
I guess that I just need to find a 2Ghz+ processor that's compatible with 133 FSB to get things moving (got 1.5gb Ram so that with old 6200 nvidia is enough to keep my daughter happy..... The junmpers are correctly positioned for 133, so thanks for advice.....now go looking on AMD for compatible cpu.
ps great site !

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Related Solutions

#4
September 17, 2009 at 00:08:54
Well it's great that we have help out.

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#5
September 17, 2009 at 00:15:42
There are two; the 2400+ which runs at 2.0Ghz and the 2600+ which runs at 2.13Ghz. The latter is almost impossible to find. These are model 8 (Thoroughbred B) cpu's. There was also a model 10 (Thorton) core cpu that ran at 2Ghz. Make sure your motherboard supports 15x and 16x multipliers.

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#6
September 17, 2009 at 00:51:04
OK thanks for specs on other cpu's - off to see if mb supports these multipliers then....I can get 2400 from same place I got the (wrong) 2500...many thanks
lets see if I can make this work then !
cheers
Beanie

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#7
September 17, 2009 at 17:45:42
http://www.starmicro.net/detail.asp...

Expensive ain't it? The numbers and what they mean...

http://www.amdboard.com/amdid.html

You want to see something that ends with "C"

AXDA2600DKV3C

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#8
September 17, 2009 at 23:02:19
Out of my expertise on those one. Never heard of them yet.

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