Why do I buy retail?
It's cheaper than oem at online retailer using coupon.
It comes with good heatsink and fan.
The one I got has L1 brigde connected.
Even I burn the cpu, I can try to claim warranty replacement.
This is US, get replacement is easy, they don't care if the thing is damaged by yourself, they just send you a refurb. immediately, some even pay for both way shipping like Ericsson (I've done once for a mobile phone).