The RTL8139 PCI card does require drivers, it doesn’t work with built in. The CS II with digital 21040 works without drivers but is 10 megabit only. Not that you’ll get anywhere near 100 Mb/s with OpenTransport anyway.
Read the bizarre caveats to the CS II recreations before purchasing one...
The 80 mm fan does not do anything to cool a GPU (or more importantly the VRM) in my experience. The fanless GeForce 2 mx runs way too hot even with an 80 mm base fan. I think you’d need to rig something on the GPU itself with the 9250.
I have an L3-cacheless QS/733 that I put an 867 with L3 in, and I recall the benchmarks making me think the cache is working. Now you've got me wondering.
The only time Marathon 2 uses floating point arithmetic is at startup: it builds a set of trig lookup tables. But it will need a real or soft FPU (SANE? I’d have to look up what the original code does) just long enough to build them.
Actually, is it possible the BGA solder was starting to give, and putting the heatsink back on shifted / compressed the CPU in place such that it resumed working OK? I hope not, yuck!
Yes, running OS X happily for hours, and crashing in OS 9 sounds familiar. I have no idea why they behave that way, or why disassembling it / redoing paste / reassembling it fixed it. It would also behave better in a Quicksilver than a Sawtooth. I think there is some amount of magic involved...
I agree it's a hardware problem, but I don't think it's tough to narrow down if it runs for hours with the original CPU without issues. The upgrade card is bad :(
I used to get random crashes with the ST G4 in multiple machines. I removed the heatsink and re-applied heatsink paste, and put it back together. Have not had a problem since.
The Yikes! is only listed as having 400 MB/sec bandwidth, vs the 800 MB/sec in the Sawtooth. (https://www.theregister.com/1999/12/02/apple_drops_yikes_mobo/)
So, would a G4 ZIF add anything to a B&W G3 besides SIMD? I have one in mine, of course...
I borrowed a torque wrench from work to tighten the CPU bracket screws back to Apple’s spec. Dunno how necessary that is but it was probably the trickiest part. It’s an easy upgrade.
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