It didn't like 250/200 MHz. Artifacts on the screen and I couldn't shutdown without pressing the power button. I suspect the memory timings were too much for it.

240/190 MHz worked, but the results for Half-Life actually dropped after overclocking, that is, from 15.33 fps to 15.07 fps. Not sure why this happened, but I assume it didn't overclock properly.

Here's a photo of the two PCI GF2's.

At any rate, I've put Savage 4 Pro+ back in the case. Powerstrip says it is running at 125/125 MHz. I added a 30 mm fan to it and will see if it can handle 130/143 MHz. The Savage Pro+ contains Winbond W986416CH-7 memory chips, which according to the datasheet, can run up to 143 MHz.

Well this was really interesting! Just put together VS440FX+Pentium Pro 233MHz machine with 128MB EDO. Now using Matrox Millenium II 4MB and Voodoo 1. Sound cards are GUS MAX and SB32 with 28MB memory.

I have somewhere GF2MX PCI -card, didnt expect that Pentium Pro will benefit from that.

feipoa wrote on 2019-10-18, 18:22:

I'm in the mist of a Pentium Pro build. I plan to run a 512K or 1M chip at 233 MHz. The board is PCI/ISA only, no AGP. I'm fre […]
Show full quote

I'm in the mist of a Pentium Pro build. I plan to run a 512K or 1M chip at 233 MHz. The board is PCI/ISA only, no AGP. I'm fresh out of working Voodoo cards and was hoping to use some unused 3D card from my drawer. Here is a list of what I have. Emphasis is pre-millennium 3D games, Could you let me know which card you'd pick any why? Thanks!

ATI 3D Rage Pro
ATI 3D Rage II + DVD
ATI Rage128 VR
ATI Rage128 Pro 16 MB (original)
ATI Rage128 Pro 32 MB (chinese replica)
ATI Radeon 7000 32 MB DDR
ATI Radeon 9250 (1 vote)
ATI Radeon 9000
S3 Savage4 Pro+ (Diamond Stealth III S540)
ATI FireMV 2260
Matrox G450 (3 votes)
Matrox G200 (1 vote)
PNY GeForce2 MX400 128-bit memory, IIRC (3 votes)
Jaton GeForce2 MX400 64-bit memory, IIRC
eVGA GeForce 6200
PNY GeForce 6200
GeFroce FX5500 (1 vote)
TNT2 64/Vanta (2 votes)
Nvidia Riva TNT (one from Creative, one from Diamond) (3 votes)
Nvidia Riva 128 (1 vote)
Permedia 2
3D Labs Oxygen VX1 (4 votes)

EDIT: This chart has been copied from page 9 of this thread for convenience.
PentiumPro_PCI_Graphics_card_comparison_game_charts_combined_updated.png

I’d be really interested to see radeon 7500 pci added to this list because it ends up being like twice as fast as a 7000 in some things. Which may beat out that geforce 2 🤔

Has anyone ran into compatibility issues with the Geforce FX 5000 series and Pentium Pro? When I install a no-name FX5200 I got from eBay, it's detected as a PCI VGA device, but isn't used for display and reverts to the onboard VGA.

I thought maybe the VBIOS expects a newer CPU. But maxtherabbit got it to work with PPro. Would you mind sharing which Geforce FX you have and possibly the VBIOS version? My VBIOS is 4.34.20.36.00

The other possibility is maybe the motherboard is too strange. This is a quad Pentium Pro with a split PCI bus. I can't get a PCI SATA adapter to work on this either, despite it working on an older socket 4 Pentium:
Need PCI SSD controller compatible with Pentium Pro chipsets and Windows NT 4

FX5200 on my dual PPro PR440FX

There were tons of incompatibility issues with early pci chipsets. In your particular scenario, the onboard video is likely to blame. There was no way to predict later pci video cards.

You mentioned split pci bus. Ate there limits to what kind of devices work on the bus? Because on my p65up8, it has a secondary pci bus via i960 bridge, and that bridge chip precluded the use of anything with an option rom.

Thanks Max. So you have a 440FX chipset. That's newer and more consumer oriented than my 450GX.

I read on other threads of attempts to install a Pentium Pro in a slot 1 and usually the BIOS won't recognize it because it expects Pentium 2 or later and reads ModelSpecificRegisters that don't exist. I doubt a VBIOS would do that or use the newer MMX & SSE instructions.

There was no way to predict later pci video cards.

Right, 450GX was released in 1995 while Geforce FX5200 was from 2003. I could get display output when using a Rage XL card, so I don't think the on-board Cirrus Logic VGA is the issue.

These are the limitations in the Compaq tech brief PDF I shared in the PL5000 thread. I did get a parity error when using the Rage XL card whenever it switches from being controlled by the VBIOS to the Windows driver.

I did try moving the Geforce FX to one of the slots on the primary bus, but no difference. I don't get why they're called primary and secondary. Both PCI bridges are directly attached to the CPUs' bus (fig. 3 in tech brief). On your p65up8, it sounds like the second PCI bus is hanging off the 1st (fig. 2 in tech brief).