From this list of coolers, which would you recommend for the 5500?  And how would I know if they have compatible mounting holes?

http://www.newegg.com/Store/SubCategory.aspx?SubCategory=576&name=VGA-Cooling

http://www.frozencpu.com/cat/l3/g40/c16/s227/list/p1/Air_Cooling-Chipset_HeatsinksCoolers-Active-Page1.html

http://www.frozencpu.com/cat/l3/g40/c21/s223/list/p1/Air_Cooling-VGA_HeatsinksCoolers-Universal_Card-Page1.html

What unofficial SP3?  There's an unofficial SP3 for Win98?

Dosbox is a bit cumbersome to use. lol

Besides, GLide/games pretty much died before XP and were made for Win9x.  I'm more interested in running older games.  And Win98 is a lot more dos-friendlier IMO.  Not really interested in trying hack/run newer games on 3dfx.  If I want to play newer games, got Geforce 580 on Win7 for that.  

Planning to build a retro system with Win98.  Can I install 2 video cards, one geforce 6800 agp, and one 3dfx 5500 pci on Win98?

Thank you for replying.  
So looks like Win7(64bit) is out of the question.
Yea, my monitor has several vga/dvi/hdmi inputs.  Are there any common issues I should be aware about if I try to install a V3/4/5(PCI) on WinXP(32bit)?  Would there be conflicts with my main video cards?  I currently have 2 Geforce 580 SLI.  What kind of adjustments would I have to make?

Is it possible to use a Voodoo3/4/5 as a secondary board as you would for a Voodoo2?

I don't even remember what kind of hardware existed during 3dfx times.  So whats the most recent CPU/motherboard/ram I can use with Voodoo cards?  I current run a i7 920 with Win7 64bit and WinXP 32bit.  I have a spare PCI slot open, can I just stick a Voodoo card there?  I know WinXP driver exists for V3/4/5, but are the any Win7(64bit) drivers available?  Also are there Win7(64bit) drivers for V2?