you want to go from a b75 chipset to a z77?? or do you want to change the cpu and mb for a newer intel cpu and mb?? if your going for just the mb i would use the old rig till the mb failed. just make sure the mb bios is updated.
the older z77 mb are hard to find and are costly. http://www.newegg.com/Product/Product.aspx?Item=N82E16813157293
you want to go from a b75 chipset to a z77?? or do you want to change the cpu and mb for a newer intel cpu and mb?? if your going for just the mb i would use the old rig till the mb failed. just make sure the mb bios is updated.
the older z77 mb are hard to find and are costly. http://www.newegg.com/Product/Product.aspx?Item=N82E16813157293