slivercr wrote on 2025-03-21, 05:16:Indulged a bit yesterday and bought a funky motherboard to test CPUs with […]
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Indulged a bit yesterday and bought a funky motherboard to test CPUs with
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I wasn't too sure, but intel branding, ISA, and 3 RAM slots suggest it's a 440BX so I pulled the trigger. Looks to be this motherboard.
From the same seller I got a Radeon DDR, the AIW version–I was missing an og Radeon in my collection so this is quite welcome!
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I finally had a chance to test these items. The Radeon unfortunately shows some artifacts when plugged in. Ill try cleaning it and reflashing its BIOS to see if it can be saved.
The motherboard is very curious, it is indeed 440BX based. I used the manual available in The Retro Web and according to that, the PCB can accommodate a 440ZX, a 440BX, an Apollo Pro+, or an Apollo Pro133.
The manual lists an onboard VRM 8.4, the spec that came out to accommodate the Coppermine CPUs. There's an onboard LM2637M as pointed out by Ozzuneoj earlier.
Ozzuneoj wrote on 2025-03-21, 07:51:
Kahenraz wrote on 2025-03-21, 05:47:
slivercr wrote on 2025-03-21, 05:16:
Indulged a bit yesterday and bought a funky motherboard to test CPUs with
That's kind of odd. The website you linked doesn't mention Coppermine support, even though it's a 440BX. Something worth checking out and letting us know if it's supported.
The voltage regulator should support the lower Coppermine voltages, so it's just a matter of whether the BIOS does or not.
The clock generator is a Cypress W144H, capable of up to 150 MHz FSB.
The motherboard has no fan headers though it has the silkscreen for a couple of them, has 7 expansion slots, and a lot of jumpers all over the place.
I tested a few Slot 1 CPUs and it posted with everything except for my Celeron 333 Engineering Sample.
Celeron 300A
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PentiumII 450
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Coppermine 750 MHz
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Coppermine 1000B (7.5x133)
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I couldnt find my stash of s370 CPUs to try any, so those tests are pending.
I did try the frequency jumpers, overriding the frequency to 100 MHz to overclock my 300A
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I think in the future Ill spend some time with this motherboard and see if there are any enhancements I can make.
The manual lists most of the jumper configs, but Ill poke around for undocumented features.
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