Did cap FPS on Alt WoW instance? (both foreground and background caps)
Yes, 45/25 on all slaves, 60/25 on main.

Did you set processor Affinity for each WoW instance?
Yes, 255 for all.

Did you turn GFX detail down on alts?
No, same settings for all clients. I often PIP and was hoping to keep this, but if it's the only way I'll do that.

Did you install all the latest drivers / service packs / firmware updates?
My windows is all up to date. This computer is only a few weeks old so I haven't checked much more than that.
I don't like installing graphic card updates unless theres a serious problem, it's caused me too much pain in the past.

Hmm, I'm running 180.44, latest is 181.22. I'll install that later today or tomorrow, thanks!

WoW is SLI friendly btw.
I can't use more than one monitor with SLI can I?
Edit: Ah, I see the new display drivers support multiple monitor SLI, awesome.

Did you disable all addons while testing?
No, though I'm not running a lot of addons.
Macaroon, Jamba, Pitbull, Cartographer, fubar with plugins, nquestlog, lightheaded on main.

Do you have some shitty anti-virus software running?
I have AVG free edition, which has never caused me problems before .


So in conclusion, new display drivers!
(I feel like an idiot for not thinking of this myself btw ).

Thanks Fursphere.