Roman555 wrote on 2023-09-07, 07:23:
shamino wrote on 2023-09-06, 23:32:
Roman555 wrote on 2023-09-06, 10:44:
The BIOS is the latest.
I suppose we discuss here PIII-500 Katmai not Coppermine. So maybe is not so bad about compatibility of the chipset and the CPU
One of the video cards I tried on my LX boards was a Geforce2 MX AGP.
They locked up with Katmai and Coppermine, but worked fine with Deschutes and Mendocino.
Yes, I agree about hangings of PIII on 440Lx mainboards. I've read it on forums. Supposedly the problem is SSE instructions which is feature of exactly PIII (not P2). 440Ex was presented later and the error was corrected
Interesting. I didn't know the chipset had anything to do with SSE, but if it's involved then maybe that's why P3 locks up. Perhaps there's a later stepping of these 440EX chipsets that might not have the problem?
Seems another solution would be for the BIOS to disable SSE, if it's even possible for a BIOS to do that, but it would need an update that this board apparently doesn't have.
I'd be curious to try some other non-3D test that uses SSE, just to pinpoint if it's really SSE causing the lockup. I'd also love to try a PCI card on one of these boards to confirm it's not an AGP issue.
naujoks wrote on 2023-09-11, 09:32:
I'm not using the P3 anymore.
I'm using the P2 350MHz, and despite of me chosing 333MHz in the PnP BIOS, it registers as 233MHz.
The "333MHz" preset in the BIOS just autoselects the 66MHz bus clock and 5X multiplier, but your CPU won't accept that multiplier.
As rasz mentioned, your P2 350MHz has a 3.5X multiplier, so that's why it runs at 233MHz when used on your board with 66MHz FSB clock. The multiplier on your CPU is either entirely locked, or it just won't allow setting higher than 3.5X.
This is a Deschutes core Pentium 2. Most Deschutes CPUs are either locked to 1 specific multiplier, or only allow lower multipliers. You can try bypassing the BIOS and setting a higher multiplier manually with the jumpers as giantclam posted. That doesn't work with most CPUs but it wouldn't hurt to try, you might get lucky and be able to set 5X.
If that doesn't work, then the fastest Pentium 2 for this board would be the 333MHz. The P2 333Mhz is a Deschutes chip like the 350MHz, but it's meant for boards like yours with 66MHz FSB and comes with a 5X multiplier.
The Mendocino Celeron CPUs would also work in this board. All Slot-1 Celerons are compatible, but if you use a slocket adapter then you can also use socket-370 Celerons. In that case you have to be sure the Celeron is a Mendocino - those are the ones that are black and silver like a Pentium MMX. The Blue/green colored ones (which look like a Pentium 3) are Coppermine chips based on the Pentium3 so they won't work.
There are Mendocino Celerons up to 533MHz, but most 533MHz Celerons are Coppermine based and incompatible. So if you shop for these you have to make sure which type it is. They're easy to tell apart from the appearance.
If you don't mind overclocking, the fastest option would probably be something like a Mendocino Celeron 433-466MHz, and run it at 75-83MHz FSB. This would put you in the low 500MHz range but with a faster FSB, so it should be faster than the 533/66. Low to mid-500s is about where the Mendocino Celeron loses stability, so the 533MHz model isn't good for overclocking. Something in the 400s gives you room to overclock the bus a bit, and those models should also be easier to find and cheaper.
If you go that route, look for a slocket adapter that has Voltage jumpers on it. That way you can boost the Vcore a bit to help stabilize the overclock if it's needed.
If you raise the FSB to 75MHz or 83MHz on the P2 that you have now, it will run at 262MHz or 291MHz. Depending what you want to do with this machine, the speed might be fine.
