I won't buy another Winchester core from a vendor, I'd rather buy it from an individual who will read me the manufacture date & stepping code. The difference that I saw between the 0504 that I bought brand new from MWave & the 0441 VPMW that I bought from a guy on ebay a few weeks later was monstrous. Check this, the 0504 would run no higher prime95 stable than 215fsb x 9 cpu multi = 1.935ghz on 1.5v. The 0441 I have had all the way up to 311fsb x 9 cpu multi = 2.799ghz on 1.5v prime95 stable!!! I've cut it back to 2400 till my xp-90 gets here . I got the chip for $152 shipped, and have been extremely pleased ever since. The latest batch of Winnys blow for oc'ing, do some searching for a 0441-0444, WELL worth the effort.