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#11
Er, what?
Onboard graphics with SB require a suitable motherboard chipset and a CPU that includes the GPU function. If you use a CPU that lacks the GPU components, there is no onboard graphics. I know of no pre-SB precedent for that. I suppose that the motherboard could reserve some system RAM for the nonfunctional graphics, but that'd be poor design.
This is mostly irrelevant, though. A motherboard with a proper BIOS should permit the onboard graphics to be disabled, so you wouldn't lose a bit of your 16GB of RAM. My Asus P8Z68-V Pro had such a BIOS (UEFI, really). I find it hard to believe that your preferred brands would do worse. You may have to wait until the systems come into the hands of users, if you wish to be absolutely sure.