Here is a list of currently available bioses which will fix the Valve CEG related problems (BSOD & performance).

Asus Crosshair V Formula (9921 Beta)

----------------------------------

Asrock 970 Extreme3 (1.20 Official)

Asrock 970 Extreme4 (1.50 Official)

Asrock 990FX Extreme 3 (1.20 Official)

Asrock 990FX Extreme 4 (1.50 Official)

Asrock 990FX Fata1ty Professional (1.50 Official)

----------------------------------

Gigabyte GA-990XA-UD3 (10D Beta)

Gigabyte GA-990FXA-UD3 (F6C Beta)

Gigabyte GA-990FXA-UD7 (F7E Beta)

Gigabyte GA-780T-D3L (F2 Official)

----------------------------------

Jetway HA18 (A03 Official)

Jetway TA97AG (A03 Official)

Jetway TA97AG3 (A03 Official)

The performance improvement in e.g Deus Ex: Human Revolution is massive.
I measured following framerates before and after:

Before - Minimum: 13fps, Maximum: 34fps, Average: 19fps
After - Minimum: 102fps, Maximum: 149fps, Average: 123fps

I will update the list as soon as the new bioses are cleared.