The h50 isn't so hot as a cooler .... wait ... perhaps better said "isn't so cool" as a cooler
But hard to tell w/o knowing your temps under load.
If ya need better, best I've seen is the Thermalright Silver Arrow. If ya want something similar to the H50 .... almost identical to the H50 in fact, try the Antec Kuhler 620. Both are OEM'd by Asetek who also sells a model identical to the H50, but the design improvements that are unique to the 620 make one heckuva difference:http://benchmarkreviews.com/index.php?option=com_content&task=view&id=694&Itemid=62&limit=1&limitstart=4
620 was 7.2C better than H50 w/ stock fans
620 was 9.4C better than H50 w/ Delta fans