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Can anyone run 3dMark Vantage and see the Pixel Fill rate. I'm curious to see whether if any one has the 5 GPC part.
Here is Anandtech's result for 4 GPC version.
http://www.anandtech.com/show/6973/nvidia-geforce-gtx-780-review/17

"Depending on the configuration, the GeForce GTX 780 can be limited at the rasterizers at either 32 (the most common) or 36 or 40 pixels per cycle."

According to
http://www.hardware.fr/articles/894-5/performances-theoriques-pixels.html

So although 1 less raster engine doesn't matter as we are not triangle count limited, we may be pixel rate limited.

Some calculations:
At 4k display = 8294400 pixels
At 30fps, it needs 248 832 000 PIXELS per second or 0.248832 GPIXEL/s

When applying 4* AA, the required GPIXEL quadruples. I think pixel fillrate bottleneck for GTX 780 card when seeing that at 128bits precision blending the GTX 780 has fillrate of 2.9GPIXELS. Although a Titan only fares a little better..
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