From chip support perspective:
On Nvidia side - up to GeForce 4 MX will work with 5V signal directly. May or may no boot due to BIOS issues though.
ATi dropped 5V support pretty early and late PCI Rage XL cards already had no support.
Matrox - no idea, because all relevant cards (pre-Parhelia) include converters. But some had PCI-PCI bridges, which are capricious with old chipsets.
S3, Savage 4 in particular, should be safe to use.
3dfx - all AGP cards up to Voodoo 3 will work with robust AGP-PCI adapter without signal conversion, but Voodoo 4/5 will not. Banshee and Voodoo 3/4/5 PCI will work.
Last edited by The Serpent Rider on 2023-03-18, 19:03. Edited 2 times in total.
I must be some kind of standard: the anonymous gangbanger of the 21st century.