Proofy :
turkey3_scratch :
You're not taking into consideration the PSU. R9 380 is about 80W more than a GTX 960. The only reviewed Litepower unit ever was the 450W unit on Hardwaresecrets. It's an older design so it probably has age on it for sure, and it's better to use a GTX 960 with it.
550w is more than capable of running R9 380. He should upgrade it that's for sure but by then R9 380 over GTX 960 any time, even with 550w psu
550W is a meaningless value. Labelled wattage means
nothing.
As I said, only the 450W unit was reviewed, and with an 85C rated primary capacitor form Taiwan, I wouldn't put much strain on it, especially since it is an older design.
We also have no clue how the PSU handles transient response, which is important when gaming. Transient response at lower loads is usually handled better than transient response at higher loads.
Lastly, I'm assuming it's a group regulated design; if it is, it'll have poor line regulation under a heavier 12V crossload, which is a realistic situation today.
Also, another area of concern could be the rail distribution and the thresholds at which OCP goes off. On these units, there are two 12V rails, one holds the CPU ATX12V cable, the other is all other 12V cables. I'ma fraid an R9 380, especially one with an overclock, and adding in the motherboard power requirements, HDD, fans, etc. could trigger OCP.
Edit: 380X proves my point even
more! That's about a 230W GPU, he'll want to upgrade his power supply to a better quality unit if he gets it. That, or get a GTX 960.