TF with MT uses 2.x threads, but you allways notice a drop since the BONIC projects are heavy on the cache. It was the same with every cpu i owned till now (C2D, C2Q, and even on X4). You notice it less in gpu bound games like crysis, but you still have a considerable fps drop.
That SB has an additional concern with the TDP limit isn't exactly helping this either.
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