What's wrong with Al for heatsinks?
Sure, it's thermal properties are not as good as the same volume of copper, but it's considerably lighter and cheaper.
The first heatsinked graphics card I had, was an S3 Savage 4 - with a small passive heatsink - before then I favoured Cirrus, from the 5428 VLB, to the card I had for a long time, the 5446 PCI - the "Visualmedia accelerator".
Another time, trawling through computer fair junkboxes, I pulled out a later Cirrus card, a 5480 or something, but it turned out to be bad - for Â£3, I wasn't going to bother, but mentioned it next time, and though I never expected it, the chap said they were all supposed to be WORKING system pulls, and to pick another.
The card I pulled out next, turned out to be a Matrox Millenium 2 - used to be an expensive card, but now relegated to the junk bin.
Voodoo 3 are a level up on that, with a few more graphics tewaks (and Glide, of course) ... reminds me, I must get a Glide-wrapper that runs on XP, and see if I can still run the 3D version of CTHUGHA.