query about hp pavilion g6-2202ax at reliance digital store :)

I am planning to buy a normal low budget laptop hp pavilion g6-2202
Shop for HP Pavilion G6 2202AX Notebook at Reliance Digital
it is available at reliance digi shop at 26k which is much less then lamington road price too... should i go for it or not
also i have doubt about RAM on HP site it is 4gb but reliance digi showing 2gb.
I'll update to 4gb....
but what about authenticity...
answer quickly