750W + for a Single GFX Config? Are you kidding me?
620W is more than Sufficient. GTX670 is not a HD6990 even then 620W is enough.
I suggested 620W only in first place. I think you overlooked that part. With everything overclocked, I don't think there would be much headroom left if he upgrades more components in future! That's why 750+ W was suggested. Also do note that PSU and cabinet are two components which can last longer than anything else. Anyway, if OP is content and not planning to upgrade in future, he can opt for 620W.
@OP, I think 5-6 fans are just overkill and might ruin the airflow due to extra turbulence. So be careful in selecting which slots to install fan into.
Which is the Best Place to Install a Case Fan? - Part 1 | Hardware Secrets
Which is the Best Place to Install a Case Fan? - Part 2 | Hardware Secrets
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