From what I've read there is a difference in 8psk and 8psk turbo. It is as follows:
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Broadcom's 8PSK turbo code FEC (Foward Error Correction) "increases information throughput by 35 percent over QPSK. 8psk Turbo Code 2/3 FEC add's about 10% data throughput over 8psk Viterbi RS 2/3 FEC. For DN that means going from 39.6 Msp/s (Mega Samples Per Second) to 43 Msp/s per transponder giving them 7 HD Channels @ 6.15 Msp/s each.
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