If a motherboard require a bios version F5 to support the i7 3770k, if the motherboard came with an older bios version (F1,F2..) can I at least boot my system with this cpu so i can flash the bios to F5 ? or the system will not boot at all ?
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Generally no.. it will not recognise the CPU without the compatible BIOS so will not boot. You need upgrade before changing CPU. HTH Cheers