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980 with 8GB ?

I don't think SLI on your 460W PSU would be a good idea.

Here is my (non overclocked GPU) reading from my PSU during firestrike ultra combined test:

http://imgur.com/hgwiO49

432W out is worryingly close to the 456W on 12V your PSU can put out.

You also won't see an nVidia card working in SLi on x4/x4. The SLi bridge is supposed to provide 1GB/s bandwidth, they don't expose APIs to see exactly what's happening but the leading theory is that the SLi bridge is used for low latency synchronisation data and there is still lots of data pushed over the PCIe bus. For this reason, nVidia will not allow SLi on x4. That's why the z97 boards that support 3 way crossfire (x8x8x4) don't do 3 way SLi.

The only way you get 3/4 way SLi on z97 is with a bridge chip meaning each GPU gets x8 or more.

And a bridge chip brings latency issues which could also produce stuttering problems on multi card set ups. :(
 
I don't think SLI on your 460W PSU would be a good idea.

Here is my (non overclocked GPU) reading from my PSU during firestrike ultra combined test:

http://imgur.com/hgwiO49

432W out is worryingly close to the 456W on 12V your PSU can put out.

Don't forget that I'm using a low-power CPU, a 3770S, and I'm not overclocking. I should be fine power-wise.

You also won't see an nVidia card working in SLi on x4/x4. The SLi bridge is supposed to provide 1GB/s bandwidth, they don't expose APIs to see exactly what's happening but the leading theory is that the SLi bridge is used for low latency synchronisation data and there is still lots of data pushed over the PCIe bus. For this reason, nVidia will not allow SLi on x4. That's why the z97 boards that support 3 way crossfire (x8x8x4) don't do 3 way SLi.

I feared this. Oh well.
 
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