For a single 7970 never an issue for high clocks. BUt for gaming 1.2Ghz is very suitable. Above that occasionally you would have artifacts
If you do a CF 7970 then you may need to individually set the clock for each card. your results would vary.
Hence the asic score is cruical when doing CF if you are lazy and like to same settings for all. Also normally the lower the asic the lower the voltage you need to set the card when overclocking
For 5780x1080 depends on your settings and your eye. If you like to play at high settings would not be possible
New games are full utilizing the max capablity of the new top end cards
Max payne pushs the limits on the graphic card same with witcher 2
for max payne if you are using 1920 x 1080 on max settings, without AA , you would need 2890 Mb of graphic ram
if you are playing max settings with 8x ( max aa) you would need 6100 mB of graphic ram
Max payne in the settings menu has a readout that reads you memory needs
7970 cards has various issues but its a really good buy if you are going for full block watercooling.
standard has too many issues, too hot, noisy, and above 60C the cards is not so stable when overclocking. You can read on the forums and experience it your self. also memory heat is really important hence the full block. chances for artifacts to happen increase exponentialy with memory. If you overclock it, higher chance of artifacts same with the heat.
using trifire 7970 so i am full aware of the limitations of the cards. So far until before max payne, the card is quite crap versus the 680. After max payne it starts to really shine. 680 still beats it on frames per second.
If you are buying a 7970 don't buy the reference card unless you want to overclock. actually don't buy would be best. Just buy like the dc2. The reference card is way too noisy and hot. Now with dc2 cards there are waterblocks for it. Plus resale value for reference cards are super low
i bought my last 7970 at rm1200. brand new was 1750.
Was planning to play Battlefield 3 multiplayer with 5760x1080p on ultra settings, I have seen very outstanding result from many benchmark but only found out that those were based on Single player campaign mode.
Such as the GTX 680 SLI, they have very outstanding overall score of "70 to 80 FPS" while playing on Ultra settings 5760x1080p (Nvidia Surround) on Single player mode. But base on my source, it was a total different score when playing the "actual" game on multiplayer, 64 players, ultra settings, B2K maps mode...even with two of these beast (GTX 680 SLI), it could only support the game with an average 40~50FPS. Sometimes, during intense battle...it (680 SLI) could barely keep up with only 20~30FPS.
I heard that AMD always have the upper hands on Multiple Display Setup, that is why I'm willing to take my chances on my next build with it (HD7970 Ghz Edition). Hope that it could live up to its reputation (Eyefinity).