HMM, i put 430watt antec TP's in all customers pc (not top gamming rigs) and they cant sometimes hold rail on o/c even the mutli not fsb, 350 seems low in this day.
Aside from that your GT will give you most of the 2005 score, although there is 2 CPU test.
Im running milder o/c than normal as im testing GPU this week but i hit 5990 in 2005 on a 32bit mobile @2500@400fsb and 1 gig corsair XL, so im not sure if thats normal for your GT or not.
Next week i will bump back upto 2.8gig@450fsb and try beat 6000 mark.