There are lots of examples of heating probs with 2.8 and above. For sure, if you use the old one you will have problems. You need, at least, the correct one or one with the copper core, as mentioned by jurgen36.
Also, you will likely need further fan flow onto the processor in addition to that copper-core heatsink\fan combo.
As both people above said, use the correct one. Even better would be to order a better one at, say, newegg.com.
I say this as i have read so many times about heating issues with those intels from 2.8 and above.
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