Translating 1-screen recommended specs to 3-screen specs

[Billy Pilgrim]

Hi
If you look up recommended specs for a game, you get info that is relevant to using just one screen.

I'm wondering how that should translate to three screens.

For example, let's say a game's recommended specs are:

CPU - 2.4GHz Quad-Core
GRAPHICS -GTX 460 (that GPU has: Core Clock 763MHz; Memory Clock Speed 3800MHz)
MEMORY - 4Gb

So those recommended specs above are for one screen, but what GPU/CPU would you have to get to get the same game performance on three screens?

For the GPU: Do you simply need three times the speed?

What about RAM, CPU?