On the Sandisk web site they are showing new ExtremePro ( up to 90MB/s read/write ) and new Extreme ( up to 60MB/s read/write ) compact flash.
The Extreme SD ( up to 30 MB/s read/write )
What are the write speeds possible in Nikon D300s?
Are there any Dslr that can write more than 30MB/s ?
Rob Galbraith shows fastest speed in D300 is 30.3 MB/s RAW Sandisk Extreme Ducati.
D90 is 20.1 MB/s RAW Sandish Extreme III
So considering this: are the new ExtremePro and Extreme overkill?
Now I know 1 more advantage for D300s compared to D90 is that you can use faster memory card ( compact flash)