GPU question for WoW 10-15boxes

[Quiding]

I have two titans. I wouldn't recommend going above 15 clients on one machine.

Is that on highest settings?
My old gtx 9800+ can run 5 at low settings (30fps slaves 60fps main) and GPU-Z is telling me im only using up 20-30% GPU Load (400mb used), with 2 Titans I can't imagine you can only run 15 clients? or will the extra clients add that much more?
I guess it must be the settings.

[Multibocks]

It's all based on what you feel comfortable playing. I tend to turn up the effects and dial down the view distance. I only run 13 clients, but I get a couple chugging frames per play session. When I had just 680s and two computers my experience was much better with only 5 clients on each computer. I highly recommend doing the mid level computer route with multiple computers vs the super computer route.