You need 24A on the 12V rail for the 270X and 500W in total for the pc.
The Thermaltake 530W SE is not certified or recommended. Instead, I'd recommend an Antec HCG 520M
Austin R said:
That PSU has a lot of issues, I would suggest getting a bigger PSU 600/650W since the min sys req is around 500W and in the future you may want to make some upgrades to your overall system.
Sorry for digging up, but please, tell me more. Why this PSU isn't recommended (for 270X or generally speaking?) and what are the issues? This is a very popular power supply in my country, people recommend it even for GTX 770.