I was testing out a Siemens-Nixdorf W26361-D850 today, but I thought it was dying on me as I was getting all sorts of issues. (This card was working fine when I was benchmarking it along with all my PCI cards on a Gigabyte GA-586TX3 board.) I plugged it into my newly acquired MSI MS-6119 BX2 and Diamond Viper 550, but it does not work with PC Player Benchmark and Quake in 640x480. It also locked-up when loading Doom.
Didn't think it was a VESA BIOS issue at the time for some reason, so I thought I would test it on an older board. I knew it worked fine on a TX chipset, but didn't have the Giagbyte to hand, so I got out my Supermicro P5MMS98. Well, that was a mistake! The board booted but locked up after it counted the memory. I can get into the (AMI WinBIOS) but the left edge has a yellow vertical line which isn't normal. Now I'm sure it was on the Virge of death right? (Perhaps it has an issue with the Cyrix 6x86MX 233 with 75MHz FSB?)
Maybe third time lucky, so I got out another board a Gigabyte GA-5AX, and this time it booted into DOS. Again the same issue as the 440BX board, 640x480 was not working so it had to be a VESA BIOS problem. Used Univbe which solved the issue with PC Player but not with Quake. Has anyone got Quake working in 640x480? Anyway, glad to know it isn't dead as I lucked out getting this card in an auction as "non-working" along with some other cards.
So yeah, the ET4000/w32p is a "diva" card but it is very fast in dos! The moral of the story here is to consult Vogons first so you don't waste 2 hours of your life!