I was getting solid spikes in the 2000 range with the F3 bios on my DS3P.
Just updated to the final F4 bios posted on the 18th and my latency is solid around 50, with a few spikes in the 400 range if I am scrolling, loading stuff, etc which is completely normal.
Glad to see this has been fixed. Hopefully people that were following the locked DPC latency thread get wind of this and update their machines as this 'imaginary' problem seems fixed now.