X4540 Windows RAID5 Performance

We have good performance from our X4500/X4540 hardware when running ZFS on Solaris but now have a requirement to use a couple of them for Windows directly. We have tested an X4540 with Windows 2008 x64 and various RAID5 volumes both using the storage tools native to the OS and using Veritas SFW but have very poor write performance.The sequential read performance is fine >500MB/s but 18MB/s for sequential writes on an 8 disk RAID5 volume is unacceptable when a single disk or a mirrored pair are able to sustain >60MB/s. I have been using iometer to generate the load using the same test profile I use for other storage. My suspicion is that the software RAID stack in Windows is restricting the performance as a Dell PE2850 with a 5 disk U320 software RAID 5 volume also has poorer than expected performance. Before we use our Premier contract to ask Microsoft about this I thought it was worth asking here if anyone else had experience of this? It's so bad we've thought about running Solaris on it and then Windows in VirtualBox and presenting iSCSI targets from the host to the guest.

Thanks for letting me know I'm not alone with my RAID 5 performance issue. I posted on some Microsoft Forums too but all I've had back is a recommendation to use RAID 10 which IMHO was less than helpful.
I hadn't tried the Nvidia teaming but have just configured a failover pair using two unused interfaces on a X4540 and I get a fifth interface listed with the Device Name "NVIDIA nForce Networking Controller Virtual" and it appears to operate as expected. Then I configured it as 802.3ad and it hung entirely. Not good.

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