AMD's VLIW weirdness
Check your 2x5970 results, somehow looks really weird (most noticeable SHA1). Temperature throttling?
OK, here are my benchmark results with my 4 x Radeon 5870 for:

oclHashcat-lite v0.15 with cat 13.1
oclHashcat-lite v0.16b17 with cat 13.4

(see attached files)

Note: v0.15 kept crapping out after IPB benchmark for some reason so file ends there.

Attached Files
.txt   benchmark_lite_0.15.txt (Size: 6.44 KB / Downloads: 7)
.txt   benchmark_lite_0.16.txt (Size: 9.03 KB / Downloads: 9)