Is there anyone that can say what the best way is to cool voodoo2`s in sli?

If the cards are getting too hot then there is something wrong with them, unless you are OC'ing the cards.

TennMax makes a very good fan for the Voodoo2.
Take a look at the TennMax Stealth V2 Cooler.
http://tennmax.com/voodoo2/stealth.htm
This fan works very well.

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Asus P4P800 i865PE | Intel 2.8 GHz P4C | 512 Mb Kingston PC3200 Dual channel DDR SRAM | 80 Gb Western Digital SE HD | Plextor 12/10/32A CD-RW | Win2000 SP3 | ATI Radeon 9500 Pro | SoundMAX 5.1 Digital Audio|

But the tenmaxx blows hot air in sli against the other card i have heared that the tennmaxx in sli is not that good.

Sorry I tried to help.

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Asus P4P800 i865PE | Intel 2.8 GHz P4C | 512 Mb Kingston PC3200 Dual channel DDR SRAM | 80 Gb Western Digital SE HD | Plextor 12/10/32A CD-RW | Win2000 SP3 | ATI Radeon 9500 Pro | SoundMAX 5.1 Digital Audio|