I dunno, I am in that stage where I want MOAR!!! I am sure that regular Gig-E would be fine enough, just wondering...
Yeah .. I'm sure you're not even close to saturating a gigabit connection.
OTOH, bigger better faster more.
You CAN do it ... but you won't see a performance benefit. You would probably learn from it, though, and you'd have the fastest pair of connected PCs in the area.
Bear in mind that this would only be a point-to-point network ... you'd connect two PCs with a pair of GigE cables. Unless you have a router or switch capable of 2GB/sec?