Pretty much any CF card is more than fast enough for the empeg. The only place one might ever have a speed issue, is when installing new audio files during a "sync".

One of my players has a pair of really old ADATA 16MB CF cards, which can be read much faster than a mechanical drive ever could inside the empeg. But writing bulk data to them is really, really, really, really, really, SLOW. So dumping new tracks to that player takes 10-30X as long as it did with the old mechanical drive.

My other players have more modern CF cards, which support 5-10MBytes/sec write speeds. Much better.

Note that the network interface, used for installing tunes, operates at only about 1MB/sec.

Cheers