XP2800/333 overclock question

[jlangner]

Looking for a work around here.

Asus A7N8X MB
Barton AMD 2800/333
512MB DDR400

Right now I have the multiplier set on 12.5 and FSB set at 168 = 2,100.

I would like to up the multiplier to 13 or higher to overclock, but when I set multiplier to 13, speed says 832mhz. I read this is a problem on some Nforce 2 MB. Anyone know any work arounds without having to do anything to cpu?

[Arminiusc]

Is that 832 just what your bios is saying? If it is your Bios saying that then you should use sisoft or something to check your speed in windows. I have read a few articles about the bios displaying the wrong speed (and usually can be fixed with the latest bios update) even though it is running at the higher speed.

[jlangner]

Yes that is what Bios says on Post screen. I am using latest Bios as well. Haven't tried Sis yet or cpu id.

[Anonymous]

my NF2 boards do the same thing, I would try 200fsbx11 if you are running pc3200. If a 2500 will do it your 2800 should too. If you get stop or kernel errors, try bumping the vcore a little in .025v increments, but I'd try not to go too far above 1.7volts, also bumping the ram voltage a smidge may help.
If you cant do the 200fsb, try backing off the multiplier a bit and bump up the fsb a little at a time, maybe you can get 12x175.

Shuttle AN35N Ultra
Barton 2500 200x11
vcore 1.675
ram 2.6v
512mb Geil pc3200

[chaz]

er, thats me :roll:

[jlangner]

Chaz, on the NF2 board, bumping the FSB does not bump the pci/agp, right? I don't want to bump my video card too much and fry it. lol

[Bionic_Redneck]

yes raising fsb up does raise agp and pci up but video cards can handle it as long as they arent overclocked already. The only real problem you could run into is when pci gets to far out of specs it could corrupt your hdd and would have to reinstall the operating system again some hdd's seem to handle higher pci bus speeds more than others but 37mhz seem to work fine with most hard drives. I think the newer motherboards do better than the older ones in this area because of the 1/5 and 1/6 divsors

[Arminiusc]

My Nforce2 board has a seperate clock setting just for the agp bus... I dont know if other NF2 boards are like that though.

[chaz]

Yes I agree with Arminiusc. I dont know about the Asus but I have 2 shuttles and an MSI that have seperate clock and voltage settings for the agp, so you can raise the fsb without affecting those. These are all NF2 boards.You can even run the memory at a certain percentage of your fsb if you want(given your board allows it).
Im sure someone else here has an A7N8X that should be able to confirm this, thats a pretty popular board.

[Madcat]

Most any Nf2 board out there lock the AGP/PCI bus and sometimes offer an option to overclock the AGP bus independently.

The reason you can't get a 13X is because even though most boards unlock it for you they don't allow the higher multiplier mapping to be enabled or in the case of higher muliplier cpu's like the 2400+ whcih uses a 15, you can go down to 13, but not below. The multiplier mapping (hi or lo)depends on what model you have. 12.5< is low. 13> is high.

Only a few boards allow multiplier unlocks across the board. Tis why I bought Abit NF7's, since they allow that. Asus doesn't offer that feature and I was quite surprised when I found they didn't enable it. I forget what other company had it.

Also the SiS746 chipset autolocks the AGP/PCI bus. On my ECS L7S7A2 it's like this. In order for me to have a higher fsb/lower multiplier, I use the wire trick in the socket to enable the lower multi maps, since that bypasses the cpu bridges. Quite easy to do and I don't have to mess with connecting the bridges on the cpu which I like.