if you use sdk 2.4 + modified kernel for phoenix, the speeds are the same (or better) than sdk 2.1 + stock kernel.
edit:
and the colors in the chart mean nothing! see discussion:
https://en.bitcoin.it/wiki/Talk:Mining_hardware_comparisonWhat is the color coding indicative of?
I think it is just a way to easily group cards of each type Fnord123 15:44, 23 May 2011 (GMT)