So I put Win 7 on a WD 10K Raptor on the Intel X79 port so that I can freely change the 8x Vertex 4 LSI RAID setup.
This is what I get when using the LSI hardware RAID with boot-up config utiliity (not selected as a boot device and no Windows installed):

Performance is pretty much as poor as ever.
Now for what I get when the drives are seperate volumes and loaded into Win 7 as JBOD and software stripe:

So obviously there has to be something wrong with the LSI hardware RAID as especially those 4K numbers with 64 queue depth are just horrible (less speed than a single drive).
Thoughts on what can be wrong with the LSI hardware RAID? Both tests are obviously with the same LSI chip, drives and firmware, so not sure why the large difference.