Originally Posted by leetmode
You can only SLI 2 690s since they are dual GPU, 2 690s is similar to 4 680s. Also I'm not sure your power numbers are correct.
A couple of questions on this...
1) I thought you could run as many cards as you like, even without an SLI bridge or motherboard SLI support. It's just that perf will suffer since everything sent between cards has to go over the the PCIe bus. No?
2) I know the 690 is dual-gpu, but isn't the SLI of the two GPUs hidden inside the card? There's a PCIe controller and an SLI bridge onboard, like having a tiny dedicated motherboard inside the card. You don't need a motherboard with SLI support to run a 690. I think it just looks like a single GPU to the outside world. Not sure, though. Feel free to correct me if you know better.