ok so I swapped my i3-540 for an i7-870 I picked up on ebay for a good price. I haven't had to reinstall windows, everything in the system is identical bar the CPU.
Set bclk to same frequency (160MHz), same RAM timing, voltage etc. the i7-870 is slower in single threaded applications. Consistently slower. eg passmark 1515 i3 on 22x160 (3.52GHz), but on the i7-870. I have to set the multi to 24x160 to hit 1542. But that's 3.7GHz, for which with the i3 I was hitting 1650 in the single threaded stakes.
Is there a clever reason why this is slower than a supposedly inferior CPU? Do I need to reconfigure something? It (obviously) wins the multithreaded tests hands-down, the only place I've noticed it lacking is in the single thread tests.
Tried turbo on and off, C states etc. They don't seem to make a difference in this regard.


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