AMD XP1800 at 1.75 GHZ - quick help

[nlh]

I have an Asus A7V333 motherboard, so, when my CPU heats up too much, it will shut down automatically with no damage to the CPU (it shuts down in a safe temperature zone, but a higher one).

Anyway, I've overclocked my processor by increasing the clock mulitplier (is this correct?) to 12.0, and the bus (I assume that's what it is) to 156.

It now runs at 1.747ghz, and it runs at 43c.

However, I had previously increased it to 1.81ghz, which would cause 3Dmark 2001se to crash to the desktop. Once I brought it down a little, it was fine there. Now, though, I will get an occasional crash to the desktop in Battlefield 1942. I believe the solution is merely to turn down the CPU again, possibly to 1.7ghz. The crashes are infrequent in BF1942, but they do happen. So, what is causing this, exactly? The CPU itself is stable - should I have increased the multiplier to 14, and the bus to less than 150? Is there a difference - is memory transfer affected by the Bus and not the multiplier?

Thanks a lot, I appreciate it.

 

[DAPUNISHER]

What do you have the CPU voltage set at? BTW, 156FSB is quite a strain on your PCI/AGP devices, I would lower the multiplier and raise the FSB to 166mhz so that the 1/5 divider will kick in and put your PCI/AGP back to their default speeds.

 

[nlh]

Sorry. The FSB is at 2x152, and the multiplier is at 11.5x. Sorry about the confusion. I guess that sets my FSB to 304mhz?

My CPU core voltage is 1.81, too. Is this safe?

Temperature has remained at 43c.

 

[nlh]

I should also mention:

I just ran a Sandra performance test - mostly to tweak, etc. Anyway, Sandra recommended I lower my Mainboard, AGP bus speed, and PCI bus speed.

Should I go ahead and lower the FSB? Possibly down to a 280 or so?

 

[Jigman]

well check if ur mobo has a 5/1 pci/agp divider, if it does raise the fsb to 166 (333) and lower the multiplier and it should be good there

BTW the multiplier does not have any effect on memory speed but fsb does, therefore its better to have a higher fsb, the 5/1 divider will keep the pci and agp bus running at default speeds thus not straining the cards.

 

[nlh]

Aren't XP cpus locked at 11.5?

I tried setting the FSB at 166/33 (I guess it would be 2x166), and I kept setting the multiplier lower and lower (all the way from 11.5 down to 7 in .5 increments) but it wouldn't boot. I reset it to 155/32 and 11.5, and it's at 1.78ghz now.

What should I do?

I'll check stability, etc., and see if PCI/AGP devices are working ok.

 

[ElFenix]

if you didn't unlock the cpu none of those multi switches did anything

 

[nlh]

I researched, and I see that I must physically unlock the XP at the L1 bridges (conductive grease, etc.)

I will do this another day, then. For now, can I simply overclock by using the higher FSB/Multiplier combination?