I'm pretty sure 600 FSB would take upwards of 1.6v vNB if it is even achievable on most M2F boards, unless it happens to luckily have a good clocking MCH. Even with 1.45v vNB my board is at its limit at 570 FSB, 572 FSB will not POST. I think it would take 1.45 - 1.5 vNB to stabilize 550 FSB in orthos/linpack. At 1.40v mine fails Orthos in 2 seconds at 550 FSB
One guy (Solarfall I think his name was) did hit 600FSB, but he did not provide details of what vNB etc this required, nor his cooling setup.
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