I have the same problem. I use a Gainward GTX570 Phantom and there is no Bios Update available. I will buy now a GTX670 with 4gb and i hope Fast Boot work.
Fast boot definately works fine with my asus dcuii 670. Halved my boot times
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4960X@4.7 | Asus RIVF | 16Gb@2400 | 256Gb 840 Pro | R9 290 | AX-860W | 540Air | Custom W/C
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