Vapor, in you opinion, which block do you think I would get better results on.

I have the EK HF, heat killer 3.0 and Swiftech XT here, my CPU loop is a 500 mm Bitspower res -- dual DDC 3.25's on XSPC dual top -- XSPC RX quad --- XSPC RX triple -- Feser triple -- CPU water block - EK full coverage MOBO block-- back to res. using Gentle typhoon 1850 RPM fans, that will be at 7 V for most usage.

I know it is a silly question because most would say, try it yourself and decide. lol But I do not have the equipment to test effectively enough to detect the minor differences between these block's performance.

CPU overclock is 4.5Ghz 1.4v HT on

I know either way it will be close, but lol it is nice to get that warm fuzzy feeling that I put the better performing block on, no matter how insignificant it is.