CX series is not budget or cheap, It is the lowest quality Corsair unit but it is by no means dangerous or only for a office pc, (that is a bit dramatic), My CX600 does just fine with my Rig with overclocking. However I would not attempt using a CX430 with a R9 290! I would not use my CX600 with a R9 290. The CX 750 would work, But if you spend the money for the CX750 you might as well by a higher quality 650watt unit to run it. A decent but not high quality unit like the CX series, The load on those should never be maxed because of the lower quality caps used in them.