At first blush, it appears that 0407 > 0403. 0308 is between the two. The differences will seem minimal at first, but pay less attention to RAM bandwidth than to latency and L1/L2 performance. Also, the enhancements (memory module compatibility) might be significant if you own the affected modules (I might, but am too lazy to check the QVL). Since it's a work day, I can't go into too much more testing, but here is what I have so far:
0407:
0403:
0308... keep in mind, I did a LOT of trials to get all my scores over 10GB/s:
