ICTG

You have answerd your question youself

It will work but i would choose another PSU with 80+gold and maybe a ssd and for 100$ you could buy a Corsir h100i that will cool a lot better

Then your h100i might be broken

If you buy second hand go with the specs from the scrapyard wars pc from linus and add the gpu from luke maybe add a ssd and you will have a good gaming pc.

http://linustechtips.com/main/topic/160851-how-to-fix-corsair-h100i-mount-high-temps/for the o rings: 5/16th O.D. x 3/16" I.D. x 1/16" and for the sound, i don't know but a silent humming noise at full blast should be normal but if there is any scraping noise it might be broken.

Don't know never had a Corsair h100i but many have problems with the mounting so check that and try to let it run on full power and listen to it, that might help to verify if it is broken or not.

Maybe try this http://linustechtips.com/main/topic/140982-my-experience-with-the-h80i-and-a-small-mod/ You always have to register your Windows again if you swap the Motherboard

What is you vcore at? maybe delid your cpu? I don't see why you should upgrade your Hardware

Have you tried those cards indivitually maybe one is broken, or try with the sli bridge that came with your motherboard.

Had the same issue with my gtx 680s, try to wiggle the sli cable or even turn it around and see if that helps.

Look up the new Fractal Design Kelvin S36 or S24, according to overclock3d.net they seem to be pretty silent and the cooling performance seems to be pretty good too.

I would put the 240 in the front and the 360 in the top, so you can buy a Monsta 240