Swapped to SLI for raid, Lost my boxing capibility.

[Odusx]

My guild wanted me to raid tonight so I logged off my shammys and shut off my duel display, enabled SLI, restarted running great. Another body came online so he replaced me. I tryed to log back on with keyclone and when i fired up the main wow on my main monitor, I was laggin like crazy and the screen was breaking up at the top. All this is going on while only using like 15% of my cpu, which normally runs at 30% and not laggin at all. Well im super pissed atm trying to figure something out chaing crap here and there but im just not the best at it. Anyone have any ideas on what may be causing this? Im not sure about setting the 4 different wows to a different cpu Affinity if thats my problem or what. I have restarted like 10 times, going crazy here.

[Sajuuk]

Try updating your drivers. If all else fails, just run WoW without sli.

[wowphreak]

SLI doesn't help with wow.

Most likely it was an issue of how the screens where setup.

[Chrysanthe]

SLI doesn't help with wow.

Oh, really? Why not? Well, I experienced something weird, too: on SLI my video seemed to be slower and much more laggy than w/o SLI... why?

[Qlimax]

WoW was not programmed to take the advantages of SLI, and it is highly cpu dependant, moreso that the gpu. Other games like crysis were created with sli in mind. I think it has to do with the architecture of the rendering.

[Ratboy]

I hate to tell you but very, very few games have any performance increase with SLI. I used SLI about a year ago and found that it ran better with the 2nd card disabled. I was running 2x 256mb cards so I sold them and bought a 512mb card and I saw a huge performance increase.

[-silencer-]

I hate to tell you but very, very few games have any performance increase with SLI. I used SLI about a year ago and found that it ran better with the 2nd card disabled. I was running 2x 256mb cards so I sold them and bought a 512mb card and I saw a huge performance increase.
This is exactly the reason why I nearly always recommend someone go with the best single card for the money, even if they have to spend a little more, than two cards for around the same price. There are just too many variables with SLI/Crossfire with regards to how much they help/hurt performance. A faster single card will always be faster in games than a slower single card used in a comparable SLI config.

[blast3r]

WoW was not programmed to take the advantages of SLI, and it is highly cpu dependant, moreso that the gpu. Other games like crysis were created with sli in mind. I think it has to do with the architecture of the rendering.

Holy crap! Another thing on my todo list. I have two 8800 GTS 640MB in SLI mode and an 8600 GT for my second monitor. I always noticed my main was kind of sluggish. Hopefully this will give me better performance!

[Oswyn]

I really should get off my ass and do some research on this. I don't believe SLi and Crossfire work with windows mode. Stay tuned while I ask some people that are way smarter than me...

[Anozireth]

I don't think you need SLI for a single WoW instance unless your video card is like a Voodoo2.