The silicon on the cards is really only affected by core and memory clocks. If the bus clock gets too high, data gets corrupted, but it's not going to physically damage anything.

if you're already worried about stability or longevity, just don't do it - simple as that. i don't know in which game this overclock is supposed to make the difference between running quite well or being unplayable, especially on the mentioned cards.

if it's about maxing the potential of those cards out there's other platforms that are more suitable than 440bx anyway, regardless of whether that's running at 100 or 133mhz FSB. any pentium iii isn't really that desirable for certain stuff as early as 2002.

dionb wrote on 2021-05-14, 19:17:

The silicon on the cards is really only affected by core and memory clocks. If the bus clock gets too high, data gets corrupted, but it's not going to physically damage anything.

this

IMO possible system instability is the only "risk".

My main retro rig is CUBX-E with a 1.4ghz Tualatin P3-S (133 FSB) and it's rock solid with a 5900XT and unstable with a 6800XT.

Just to clarify, the reason (and purpose) of running the bus at this speed would be a result of bumping up the FSB from 100 to 133 to match the actual stock speed of the CPU and RAM. The 440BX system I have right now, the Asus P3B-F rig, actually has a PIII 933, but I’ve been running it at 700 with a 100 FSB out of blind fear of damaging one or more of my AGP graphics cards.

Thanks for the feedback thus far all, seems like there’s no risk of physical damage. If it’s just a risk of system instability, that’s fine by me. Unless anyone has anything to dispute here, I think I’ll give it a shot and ditch the Via board altogether.

well, there's plenty of actual 100mhz options out there - slot 1 p3 1000, s370 p3 1100 on a slocket or modded tualatin 1050/tualeron 1400, and the memory situation is slightly mitigated by the fact that 133mhz RAM will usually automatically run at better timings@100mhz. but it's up to you of course. i'd just keep in mind that even if it were true that 89mhz AGP won't degrade the card the chipset will still face a 33% overclock.

auron wrote on 2021-05-15, 02:57:

well, there's plenty of actual 100mhz options out there - slot 1 p3 1000, s370 p3 1100 on a slocket or modded tualatin 1050/tualeron 1400, and the memory situation is slightly mitigated by the fact that 133mhz RAM will usually automatically run at better timings@100mhz. but it's up to you of course. i'd just keep in mind that even if it were true that 89mhz AGP won't degrade the card the chipset will still face a 33% overclock.

I've had various 440BX boards running at 89mhz for literally decades now. It's not an issue and all the good ones have a 1/4 pci divider so pci bus speed is in spec.

that's a nice anecdote, my anecdote is that BX@133mhz resulted in IDE corruption. i've also been smoking for literally decades by the way, feeling rock solid, so smoking is not an issue.

and yeah, the pci bus runs in spec - don't think anyone particularily doubted that though. doesn't change the fact that running the 440BX@133mhz is overclocking that comes with the usual caveats.

I updated the thermals on the northbridge of my Asus board when I first got it a couple years back - meaning new Arctic Silver 5 thermal compound, nothing else.

So this is the 1GHz PIII slot 1 CPU that I currently have, and this is my 933. Didn't realize until mentioned here and going through this site that this 1GHz model exists. Go figure, never found such a model when I was digging through eBay a couple years back.

In that case, what'll probably have is I'll try to secure a couple of these 100 FSB models, as well as a 440BX board to replace my Via board, and call it a day. In the meantime, my current 440BX at least has new thermal compound for the chipset and, after the discussion here, has now been running my 933 at full 133 FSB for the past day with no issues, minus some very minor graphical anomalies on occasions during boot - but not in OS or games.

murrayman wrote on 2021-05-15, 19:47:

Didn't realize until mentioned here and going through this site that this 1GHz model exists. Go figure, never found such a model when I was digging through eBay a couple years back.
In that case, what'll probably have is I'll try to secure a couple of these 100 FSB models, as well as a 440BX board to replace my Via board, and call it a day.

The 1GHz PIII slot1 cpu's that run at fsb 100 have become very rare. The last one I saw on Ebay came with an asking price of $955.
A more economically sane alternative is to get a Socket 370 1Ghz -or- 1.1Ghz fsb 100 cpu plus a slotket that supports Coppermine.

PARKE wrote on 2021-05-18, 11:02:

murrayman wrote on 2021-05-15, 19:47:

Didn't realize until mentioned here and going through this site that this 1GHz model exists. Go figure, never found such a model when I was digging through eBay a couple years back.
In that case, what'll probably have is I'll try to secure a couple of these 100 FSB models, as well as a 440BX board to replace my Via board, and call it a day.

The 1GHz PIII slot1 cpu's that run at fsb 100 have become very rare. The last one I saw on Ebay came with an asking price of $955.
A more economically sane alternative is to get a Socket 370 1Ghz -or- 1.1Ghz fsb 100 cpu plus a slotket that supports Coppermine.

Good gravy, that much? Understood! Alright, I’ll just enjoy the setup I’ve got going for now. I did order another Asus P3B-F, this time a revision 1.03 (my 933 is in a 1.04), so that’ll replace the dying Via board this week when it comes in. I’ve also got some combo chipset HSFs that have 12v 3-pin fans, NIB, that I will likely swap onto both boards since they have that third fan header nearby. Will apply some fresh AS5 on both, then see how stable the 1.03 is at 133 FSB - I know some of that revision can be persnickety.