Originally Posted by Relaxy
one more question i read that you need a good case if you want to use 780 non ref is haf x good enough with stock fans?
Honestly man; its hard to say because there are tons of variables that come into play. You can have the biggest full tower with stock fans but still have horrible air flow. Your best bet is to just get the cards and see how the temperature are. Just try your best and tidy up any visible cables; make sure no cables are obstructing air flow.... you really just need to make sure to get the hot air out of your case and not stagnant.
I have seen micro builds with great airflow; just because cable management was very very tidy. Also; get yourself some good fans that can push tons of CFM (cubic feet per minute) as they are great for case fans; try to avoid fans with high static pressure (different from CFM) because they are mainly used for dispersing heat in radiators
Your biggest goal is to disperse the hot air being emitted from your graphics card heatsinks out of your case, if you cant do that; temps will rise in your case and so will your graphics cards. Ive seen cases that are able to have great case flow even without a side fan, some argue that a side fan doesnt really help. Your best bet is just to go for it and see how your temperatures go; some people may need the extra cooling because their room temp is a lot higher than others; some may not need it because they work in a super air-conditioned place where the ambient temps are very cold to begin with.
Tons of variables to work in; but i think your HAF X should be fine considering you have the one slot spacing from your motherboard and assuming you have good cable management.
You could always go liquid cooling and slap some waterblocks on there and never have to worry about a hot multi-GPU set up
But for the most part you should be fine. (tidy up those cables though! )