Got the 400/200mhz bug on my old deck too, solved It with an RMA. This one seems to work differently, it was not present on 3.4.11, got it on 3.5.1 preview and disappeared with a downgrade. Also setting the GPU clocks to manual solves the issue, and the deck doesnt throttle as with the 400/200 MHz Bug. I will contact Valve this weekend to see what they have to say about it.
Got the 400/200mhz bug on my old deck too, solved It with an RMA. This one seems to work differently, it was not present on 3.4.11, got it on 3.5.1 preview and disappeared with a downgrade. Also setting the GPU clocks to manual solves the issue, and the deck doesnt throttle as with the 400/200 MHz Bug. I will contact Valve this weekend to see what they have to say about it.