Re: Heatsink/fan question?
Looks like 775, you'd have to take the black bracket off (to do this, you'd have to take the mobo out, undo the plastic clips behind the mobo for those 4 plastic pins in the black piece, and pull it off, is what I 'm assuming).
Also, is this a prebuilt computer? If so, what brand/model? I can look it up to make sure its 775.
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