stock cooling expect 3.4->3.6ghz stable. but around 3.6 it starts getting a bit warm on stock cooling. ive had mine @ 4.2ghz stock cooling for benchies. but to have it up around that high you would want aftermarked cooling.
my best super pi 1.5 1m is 9.906 btw D
3dmark 05 was just under 30,000 with stock gtx 275
3.8GHz was with a stock cooler, but it's just finished winter here and spring has started, so ambient temps are low. Speeds over this was with an Artic cooler.