CX PSU is crap.
Get HX , RM.. Seasonic are good. Or rosewill.
This is now really cheap 1000w. http://pcpartpicker.com/part/rosewill-power-supply-lightning1000
Cheaper than 800w.
Why do you want play with heat spredders?
Buy cooler that is OK with high memory.
I think it can't be that bad to remove parts from heat spredder.
but you can ask from g.skill support how that really works.
Id have one question them too
Temps depend more case airflow than memory heat spredders.
Or get H100i or H110i for cooler. Not so much expensive than DH-14.