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Here is my entry, good luck to all of you=)

I will try to anwser your questions: 1. Watercooling isn't possible without some serious mods, you dont have an 120/140mm fan spot clear wear you can attach a radiator. Your powersupply will need the first 120mm fan place and your second fan place is blocked by your graphics card, if you cant put a normal sized fan in there you can forget of putting a radiator + fan in there. The only way i can think of is mounting a rad on top of your 120mm fan spot (so outside your case) and then drill holdes for tubing. Everything is possible but this would require alot of effort. If you are really interested in this i can offer more information but you will save money and time when you buy another case + same watercooling. You must also take into consideration that you already got an air cooler wich becomes useless when you want to watercool your cpu. 2. i would go with frontal intake + side intake (yate loon) and the two 80mm fans in the back outake. This way you will cool your gpu aswell and you will have a nice flow. 3. If you are desperate you can put the 120mm and mount it on the outside of the case this will decrease some flow and it can ruin the looks.

It depends on the situation: Both at stock speed and at (1920x1200) resolution single screen the gtx 670 outperformed the 7970 by 4% this is an average taken from all games tested by techpowerup. (source: http://www.techpowerup.com/reviews/AMD/Catalyst_12.11_Performance/1.html). You can also check the difference in speed at all the games that are tested. A 7970 with a nice custom cooler can be OC'd to a greater extend than a gtx 670, when overclocked a 7970 will in almost every game at almost every resolution outpreform the 670 by quite a bit more than 4%. pro's and con's 7970: + better in openCL computing + when it has a good cooler (not stock) it has great overclocking potential. +good multiple screen support (because of more memory bandwith) - more power consumption especially when overclocked - stock cooler makes alot of noise GTX 670 + CUDA and openCL + consumes less power

You can run at least three screens on one single card and i am pretty sure you can connect four screens to a single gtx670. The only problem you will have to deal with is that there is no vga port on a gtx 670. You will need a DVI-I Dual link male to VGA male cable cord adapter. They are around 5-10 bucks.

Here you go, a broad guide in overclocking ivy-brdige with a gigabyte motherboard http://hwbot.org/forum/showthread.php?t=45302 Furthermore a video of a gigabyte z77 board (i think almost the same bios) with a i5-3570k its a bit different but maybe it helps more then the complicated guide. Edit: Didn't paste last letter of hyperlink...

It is frustrating but there are hardly any review sites that include overclocking at stock voltage and lowest voltage with stock speed. One site in the Netherlands, which i use often got 4,4ghz at stock voltage. My father has an i7-3770k and i get 4,5 ghz at default voltage, however i had to raise it with 0,05volt in order to runs stable (12hours prime 95 + 1.5 month without a blue screen). This doesn't mean that you have bad luck, it's just two samples!. I can't however find more reviews about stock voltage, maybe other can share their results to get a clear view on thiss matter=).