can i fit cooler master nepton 280l on my define r4
Not in the top anyway, not sure if you could get it in the front if you took out hard drive cages or something
http://support.fractal-design.com/support/solutions/articles/138156-define-r4-what-size-radiator-will-fit-in-the-top-panel-
- in the top = would be a pain in the arse - clearance with 8pin mb, heatsinks etc. but could be done if you're keen enough to mod the case
- in the front = your best bet for success
worth a read > http://themodzoo.com/forum/index.php/topic/775-diy-case-mod-guide-280-radiator-in-fractal-design-r4/