3x 30" Portrait Crossfire Eyefinity vs SLI Surround Showdown

[Callsign_Vega]

If I'm not mistaking, supersampling renders the frame at 2x, 4x, 8x and so on, then down samples it the same amount...

So, If I run 2x SSAA, then I am actually rendering a frame of 5120x2880. It should take up the same memory imprint and bandwidth.

Thats comparing apples to oranges. In my testing SSAA doesn't use nearly as much bandwidth as you are describing. I basically don't use it because it just makes everything blurry.

Says otherwise here:
http://en.wikipedia.org/wiki/Radeon_R700

According to that the port is full duplex.

The crossfire bridge in which all AMD cards use today is only 900mbits/sec as on the chart (top). There is no such thing as a side-port on the 69xx series.

Of course it is duplex, but the cards are only connected in serial so card #1 has to go through card #2 to talk to card #3.

In SLI you can see cards can talk directly to each other and not eat up bandwidth. Card #1 can talk directly to card #3 without interfering with the bandwidth of card #1 talking to card #2.