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yeah bios lock flash your 5870 bios
You have to go into MSIAfterburner.cfg and edit a setting.
[ATIADLHAL]
EnableUnofficialOverclocking = 1
This like using AMD GPU clock tool though - no throttling down/power saving when the card is idle. You'd still have to flash your card in order to OC very far using the "official" path and/or keep PowerPlay active.
I still haven't done it on my own card yet (seeing as how I am waiting a replacement and dont want to kill my only reliable 5870) but a brave workmate had me flash his. It was a very easy process and very very painless. You can save your current bios from within GPU-Z. Flashing your 5850/5870 is a 5 min process (which includes copying the needed files to a USB Thumbdrive) and pretty much seemless. You can then use the flashed Asus bios to have Afterburner work like normal, with power saving functions at idle working. He was able to get his card stable at 950/1290 with medium fan speed.
As long as you save your current bios you can always go back if needed. I will greatly consider doing it once I get my 5870 replacement and everything is running fine.