second 5850 only giving 20% increase in performance
 

i just got my second 5850 and i only get a 10-20% in fps in sc2.
doesn anyone else have dual 5850 and plays sc2 that can confirm this is normal?

thanks

SC2 was never designed or meant to be played with multi GPU setups, so it wouldn't be surprising if you got worse framerates with 2 cards.

yea ive seen people max the game with a 460 but they had a highly overclocked 2500k or higher and so its really just a cpu game :blarg: sorry to break the news to you since you just spent a couple hundred on that 5850 but atleast you can play bf3 a ultra or pretty close:biggrin:

Sli or crossfire wont give you 2X performance. 20% is already very good. That`s why we always recomend a single beast card over 2 small card for some operation.

thanks for the responds guys, i only when dual 5850 because my friend sold me his for $130.

20% is not considered very good for scaling. Maybe you meant good scaling for starcraft 2? Average scaling now a days in cf and sli is 70%. On most games with sli'd 460's I even get high as 85%.

It isn't the scaling percentage that makes most recommend one big card instead of 2 smaller because most games support cf and sli really well. It's so you don't have to wait for a new game that doesn't support it to be updated in the video driver to take advantage of 2 cards and so you avoid the chance for microstuddering. Even when the bigger card is recommended everyone almost always adds "you can always go sli/cf with another one later once prices drop."

Here are some benchmarks that you can compare your gains against to give you an idea if the gains you are getting are what they should be. If they aren't it will could be your power supply(you should have about a 750 watt) or cpu limiting you.

http://www.tomshardware.com/reviews/...ng,2742-3.html

Yeah SC2 isn't really that strong in the SLI department, way more CPU.