g1abhi :
why do you want to buy it on this site when it is available for the same price on flipkart.com
http://www.flipkart.com/seasonic-m12ii-620-620-watts-psu/p/itmduu8whz5je45j?pid=PSUDUU8WG6SHZGTT&ref=L%3A7679386536582333928&srno=p_2&query=seasonic+620&otracker=from-search
Seasonic S12II-620 is enough for me and 1k extra is unnecessary i think and if you can see the seller for the one you are saying thats actually overclockerszone same seller .this site is their own site
http://www.overclockerszone.com/seasonic-s12ii-620-s12ii-series-620w-power-supply-with-80-bronze-certification/?page_context=category&faceted_search=0