r9 270x requires 24A @12v, and 500w psu. This one
Fits all requirements, allows for overclock potential, built by Seasonic, Tier 2 psu.
The only difference with cabling is non modular/fixed tends to clutter up the area around the psu since most psu's are cabled for differing layouts, so extra cables/connectors. This tends to reduce airflow, leading to hotter components and case, and looks ugly as hell.
Semi modular uses a fixed set of the normally used stuff, like mobo connectors etc. Also has some plug in connectors so you only have cables to use what you need to. Reduces clutter greatly, improves airflow, leads to cooler case/components, looks much more presentable, neat and professional.
Full modular is the same as semi, except all the cables from mobo to pci-e have plug in connectors and no fixed wires.
Basically semi is pretty much the best way to go, valuewise, especially if your case is tight for space, or has lousy airflow to start.
Okay thanks but i've been that there is a semi modular or fixed cables what is the difference
There are 3 types of PSU's non modular, semi-modular and full modular.
On semi-modular PSU's you can unplug only expansion cables (SATA, Molex, PCI-E etc. etc) and cannot unplug main ATX (24pin) and CPU (4+4pin) cables, on fully modular PSU's you can unplug all cables!