By themselves using software like keyclone, I would agree. But most people use isboxer, which allows you to assign clients different GPUs, splitting the workload between them. If you can get a bargain price, go ahead and consider getting a dual gpu card. Now, the ability to do this could vary between cards, I'm not certain. My information is definitely dated, but I was able to do it with 9800GX2s just fine.
I know when I rebuild my machine (it's a ways off, but whatever), going to do multiple gpus (not for wow, mind you. I play on running a 30" monitor.)
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