Originally Posted by Kilamor
Which pump do you think has enough head room, this is my first time trying water cooling and i dont want to mess it up
Being that you want to be on the safe side (which is reasonable)... go with the MCP655 (vario speed) and couple that to the XSPC D5 dual bay res. "If" you still feel uneasy about that pumps capacity... do a dual pump loop or maybe even 2 independent loops. Put the vid cards in one loop independent of the other components on a different loop... But I am certain that one of these pumps will do good for what you intend.
The good thing about a custom loop is that you can always mix, match, add or take away as you see fit. Experience is always better than a review. Reviews are "guides" only in my book since they are basically an opinion expressed by the reviewer. Nothing better than the good old school of hard knocks.
I know of a member here (won't mention his nick name - he will chime in soon enough) who uses the kit pump/res and he had a total of something like 5 blocks/rads and such working perfectly fine. Could he gain a degree or two more by switching pumps and such? Probably but to date... his loop is doing great and for the investment of an upgrade, I bet he decided it wasn't worth it. So, at the end of the day... it's all up to builder what he/she wishes to do and what path they'd like to follow.
I think you should go with at least 1 MCP655 pump...