I believe on average, if I were guessing ... 10-15% depending on work load, with some apps maybe as low as 5% and some as high as 20%.
Based on what we know so far, the lower latency cache, Charlie mentioned an extra load port, which means a 5-issue design, and stuff we don't know yet. Given they are likely to keep HT alive in SB, I would also suspect they deepened the reorder buffers and increased the size of the TLBs in key places.
Memory intensive apps will benefit the most, and with an aggressive turbo scheme, both single threaded and multithreaded should see a nice pop.
Jack
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