Thermaltake Smart SE 530W Power Supply for ATI 7850

Solution
Get this one: SEASONIC is the best:

http://www.flipkart.com/seasonic-s12ii-620-watts-psu/p/itmd5xz46hjzzrax?pid=PSUD5XZ4GCGRASAY&otracker=from-search&srno=t_1&query=psu&ref=fa3ba37b-56a1-4a15-b6ed-914921d86413

Seasonic S12II 620 Watts PSU

Rs. 5199