KR7A and Athlon 2200+ XP problem

[Gary]

I've been given one and would like to use it in my ABIT KR7A
motherboard. The motherboard BIOS doesn't support it, but there is a fix
shown here:
http://www.sudhian.com/showfaqs.cfm?fid=7&fcid=16

I've upgraded the BIOS to 9N and I've done the L1 mod, but the PC just won't
boot, no beeps, no video, nothing....
Am using a 550W PSU, so it isn't because of inadequate power.

Note it's an A core version of this processor, does this require further
hacks to get it working on this motherboard?

TIA
Gary

[Wes Newell]

is this what you did?

Cut two L1 bridges on the CPU with a penknife (this will work for all
Thoroughbred B-core processors with a multiplier higher than 12.5x). Then
set BIOS multiplier option to 12.5x and above.

Note that they refer to a B core and you have an A core. Still, Iwouldn't
use this mod for rvrn a B core.B core's don't need to be modded.

If you 've done nothing else to this cpu other than the above, then
finish the job and also cut the other L1 bridges to lock the multiplier at
13.5, As long as the cpu is still good, it should then boot which a 13.5
(default) multiplier. And with an A core cpu, you won't need anything
higher than the default 13.5 multiplier to max out the cpu if you ant to
overclockit. Most of the A cores won't run much over 1900MHz if they will
even do that. 1800MHz is the default (13.5x133). There's a lot of general
info in the link below.

--
Abit KT7-Raid (KT133) Tbred B core CPU @2400MHz (24x100FSB)
http://mysite.verizon.net/res0exft/cpu.htm

[Gary]

Hi again Wes, yes I've cut those two bridges, verified with a multimeter.

> Note that they refer to a B core and you have an A core. Still, Iwouldn't
> use this mod for rvrn a B core.B core's don't need to be modded.

Yes, that's what made me think that further hacks may be required for the A
core.

> If you 've done nothing else to this cpu other than the above, then
> finish the job and also cut the other L1 bridges to lock the multiplier at
> 13.5

Purely for overclocking purposes you mean? I'll try that *if* I can get it
working in the first place ;-)

HNY!

Gary

[Wes Newell]

On Sat, 01 Jan 2005 11:37:55 +0000, Gary wrote:

>> If you 've done nothing else to this cpu other than the above, then
>> finish the job and also cut the other L1 bridges to lock the multiplier
>> at 13.5
>
> Purely for overclocking purposes you mean? I'll try that *if* I can get it
> working in the first place ;-)
>

It's not going to work in it's present state. The multiplier on boot up
will be 21x and the cpu just isn't going to run with that even if you set
the FSB to 100MHz. The A core just isn't capable of 2100MHz. Some will
barely do the default 1800MHz. If you hadn't already cut the 2 L1 bridges,
you could have just closed L3-5 and used the MB to control the multiplier
up to 12.5x, but now you've lost some of that control by cutting the 2 L1
bridges. So you either need to cut L1-1&2 (L1-5 isn't connected on the MB
anyway) or put the cpu back to original state and close L3-5. That's about
the only choices you have. with the original cpu (umodded) you could have
also added manual control of the 5th bit so you could have had access to
all 32 settings, but now that just more work. Locking the cpu is the
easiest and best choice you have at this point. Good luck.

[Gary]

>So you either need to cut L1-1&2

Done, now working, many thanks :-)