An old but very interesting Celeron benchmark - https://www.anandtech.com/show/533

According to my own measurements Coppermine Celeron 950 is roughly equal to Pentium III 700 in 3D Mark. This is due to small cache and cache being only 4way associative instead of 8way on PIII. Software which doesn't benefit from large cache should perform fine. I overclocked Celeron 633 to 950Mhz for the benchmark.

3D Mark 99
Celeron 950
1024x768 32bit - 5441

PIII 840
1024x768 32bit - 6366

PIII 750
1024x768 32bit - 5682

PIII 600
1024x768 32bit - 4800

3D Mark 2000
Celeron 950
1024x768 32bit - 3940

PIII 840
1024x768 32bit - 5974

PIII 750
1024x768 32bit - 5348

3D Mark 2001
Celeron 950
1024x768 32bit - 4730

PIII 840
1024x768 32bit - 5016

PIII 750
1024x768 32bit - 4665

Celeron is surprisingly much slower in 3D Mark 2000 than PIII. For this reason I rank Celeron 950 as equal to PIII 700 overall. In other versions of 3D Mark it was roughly equal to PIII 750. Celeron was running at 100Mhz FSB.

If you want to use Coppermine Celeron for gaming, use 900-1100 to get decent performance out of them. You will get the best performance out of them with 112Mhz FSB.

My only Celeron build is a dual 533 MHz based on a board limited to 66 MHz clock.
Despite the unsupported dual capabilities it runs fine and makes the build especially.

Edit: I see post above mentions this, can you give details? Pics?

Speaking of celerons did you guys catch that one article where someone hardware hacked two slot 1 celerons to work in dual. Or hear about that one socket 370? Mobo that came from the mfg supporting dual celeron (it pissed off intel, they said it would void your warranty 🤣)

Did anyone ever figure out how to unlock cache on any of the celerons?

According to https://en.wikipedia.org/wiki/Celeron :

One interesting note about the PPGA Socket 370 Mendocinos is they supported symmetric multiprocessing (SMP), and there was at least one motherboard released (the ABIT BP6) which took advantage of this fact.

440LX boards often supported 66, 75, 83Mhz FSB. For these boards Mendocino 433 was the best choice for overclocking.

I have a BP6 running two Mendocino's at 533. It's a great feat of the engineers at Abit, but it's not very useful for retro gaming purposes.
Other interesting Celeron combination I have, is an Asus P2L97 (440LX) which can take Coppermine Celerons at 66 MHz speed. Through a Soltek Slot 1 passive convertor board, it's currently running a 766 MHz Cellie. Quite an upgrade for such a board.

ABIT BP6 should be able to run 2x Mendocino at 550Mhz (5.5x100). That should be sufficient for games up to 1999.

AlexZ wrote on 2022-03-26, 11:30:

ABIT BP6 should be able to run 2x Mendocino at 550Mhz (5.5x100). That should be sufficient for games up to 1999.

Problem is that most games of this era runs in Windows 98, which doesn't even know about the second cpu. I ran Windows 2000 (and XP IIRC) for some time with that exact configuration though. I have 6 400 MHz Mendocinos at my disposal, hoping to find 2 that will clock to 600 for a BP6 build 😀

H3nrik V! wrote on 2022-03-28, 04:20:

AlexZ wrote on 2022-03-26, 11:30:

ABIT BP6 should be able to run 2x Mendocino at 550Mhz (5.5x100). That should be sufficient for games up to 1999.

Problem is that most games of this era runs in Windows 98, which doesn't even know about the second cpu. I ran Windows 2000 (and XP IIRC) for some time with that exact configuration though. I have 6 400 MHz Mendocinos at my disposal, hoping to find 2 that will clock to 600 for a BP6 build 😀

Good luck.
I binned my 10+ C300A's and only found one that could do 600MHz, and that at 2.4v.
And AFAIK the BP6 stops at 2.3v (?).
But hey, if you pull it off it would be pretty special =)

bofh.fromhell wrote on 2022-03-28, 20:34:

Good luck. I binned my 10+ C300A's and only found one that could do 600MHz, and that at 2.4v. And AFAIK the BP6 stops at 2.3v (? […]
Show full quote

H3nrik V! wrote on 2022-03-28, 04:20:

AlexZ wrote on 2022-03-26, 11:30:

ABIT BP6 should be able to run 2x Mendocino at 550Mhz (5.5x100). That should be sufficient for games up to 1999.

Problem is that most games of this era runs in Windows 98, which doesn't even know about the second cpu. I ran Windows 2000 (and XP IIRC) for some time with that exact configuration though. I have 6 400 MHz Mendocinos at my disposal, hoping to find 2 that will clock to 600 for a BP6 build 😀

Good luck.
I binned my 10+ C300A's and only found one that could do 600MHz, and that at 2.4v.
And AFAIK the BP6 stops at 2.3v (?).
But hey, if you pull it off it would be pretty special =)

Yeah, 550'ish smells a bit like the limit for the architecture, but hey, I have a couple of 366s which WILL do that as a fallback plan 😀

indeed, pushing a celeron300a to 600 is very difficult, but quite a portion of 366 can do 550.

noshutdown wrote on 2022-03-29, 02:18:

indeed, pushing a celeron300a to 600 is very difficult, but quite a portion of 366 can do 550.

IIRC 366@550 was a very plausible overclock back in the day, at least with 2.1 or 2.2 volts. I know, I only had to source 2 to have 2 running at 550 😁

He has 6x Celeron 400 though, those may be better dies than 300A. I've got a few Celerons 366 and 400 as well, but never got to test them apart from booting at 100Mhz FSB.