i have been looking at these 2
RAIDMAX HYBRID 2 RX-630SS 630W ATX12V V2.2/ EPS12V SLI Ready CrossFire Ready Modular Power Supply, New Version with Build-in LED Fan On/Off Switch

CORSAIR Gaming Series GS600 600W ATX12V v2.3 80 PLUS Certified Active PFC High Performance Power Supply(they say this one is not modular what does this mean?)

if you guys have any other ones i should look at please post them thankyou look for 550w to 650w price under a $100

saw this one as well

CORSAIR Enthusiast Series TX650 V2 650W ATX12V v2.31/ EPS12V v2.92 80 PLUS BRONZE Certified Active PFC High Performance Power Supply

Modular means you add the lines needed to the unit. Basically it has a bunch of plugs in the main unit and wires that fit them so you only have the lines you need and it can keep the inside looking good.


I stay away from modular.


I only buy Corsair and PC Power and Cooling units with a single 12v rail.


Stick with the Corsair GS series.