I always get OEM on my CPUs because I change almost EVERYTHING that it runs at, whether I run it 2.2ghz @ 1.2v, or 2.65ghz @ 1.6v. As soon as you change one thing the warranty goes plop, and since I'm a cooling freak I don't use the stock heat sink so I'll save myself 20 bucks and get it OEM. My 3500+ OEM Winnie performs beautifully, so don't be afraid of getting it OEM.