I have a dell xps 420 and I am thinking about getting this gpu, http://www.amazon.co.uk/Asus-7770-Radeon-Graphics-Card/dp/B0081LDXW2/ref=wl_it_dp_o_pC_S_nC?ie=UTF8&colid=1PU5C07THQN0C&coliid=IGTOMLXKLTPV1
But I only have 3gb ddr2 ram and a core 2 duo 2.83 GHz.
Will it run games better, or will it just bottleneck?
Better compare to which card?
It would be always better, bottleneck might prevent full performance from 7770, but still it is a good choice, higher not recommended.