Okay, I'm running XP SP2 here, with DX9.0c

After my Hercules R9800 Pro 128MB died (and is now on it's way to Hercules for RMA), I installed Matrox G200 + Voodoo1, since my V2's were at school (to play UT  )

Today, I brought 2 of them home, one being Creative, one some other brand, both following the reference design anyway.

The problem is, that I can't seem to get them work.
I've never installed V2's before in SLI setup, so help me out here please  

Okay, I installed FastVoodoo2's, the latest ones from falconfly.de, and it installed drivers for both V2's (both visible in device manager), but the tools only allow me to set resolution to 800x600 max, which makes me think that SLI isn't working here for some reason.
Also, nothing works, all the 3dfx demos and Unreal just stop responding.

Did I do something wrong?
Are some cables wrong?
The cables go like this: Passthrough cable from G200 to V2 installed "above" the other, monitor cable plugged to this V2. SLI cable going between V2's.