Bit late but,
[Taiga] wrote:
So far i am checking my spreedsheet of multi-gpu performance and updating prices.
mx04ma wrote:
and quad-gpu scaling performance is also a debatable issue.
^ This is going to be your biggest issue. From my experience (up to 3 cards):
2 cards: Very good to perfect scaling in most games
3 cards: Gains are less, only really getting gains in well optimized games (BF, GTAV, Crysis). Forget about games like WoT, LoL, and most MMOs. Literally makes zero difference in osu!, every Source game ever, any other game older than 6 years, etc.
4 cards: You need to have 4K/144Hz/surround/VR + an Intel Extreme CPU for this to mean anything.
I'm not trying to make GPU scaling sound like a train wreck, but diminishing returns hits pretty hard, especially in terms of value. Practicality is also a problem with more cards.
[Taiga] wrote:
480W per card at peak so 960W for this setup.
Throw in an 84W CPU (which you will need for good 4-way; + even more if OC'd) and you will run into problems with a 1200W PSU during full load. Mainboard takes a chunk of power (see that big beefy 24-pin?), and fans do as well, to a lesser extent. If you get a top quality PSU (AX-series?), then it might be able to handle it, but I wouldn't be so sure with anything else.
Long story short, SLI/CF is good, but I would not recommend 4-way. 4-way is usually exclusively for e-peen, benchmarking, or rich people. But absolutely definitely not for value. But yeah, that's just my 2 cents.