In case anyone hasn't noticed, Dell have released BIOS A12 for our X51s, the release notes show:
1. Update VBIOS in Sandy Bridge (2.0.1024 ) and Ivy Bridge(3.0.1023)
2. Update ME 8.1.20.1336
3. Add PCIE GEN3 setup item
4. Fix 5 beeps for Windows 8
Applied it to mine and no adverse effects so far, except losing just one setting as always - Dell, please stop resetting my default video back to "Discrete"! Nothing else is reset and this is just annoying.