I've had a quick look at mine, and so far as I can tell the SATA backplane in the microserver presents as four ordinary SATA ports, which then join in to an 8470 SAS connector. I think that if you can figure out how to take the server apart you could fit an 8484 to 4x SATA fanout cable instead, which would work fine with the hp p400. One thing you'd need is a low profile metal pci backplate, there's enough room for the card and connector, but you'll need a low profile backplate to secure it. View from above down behind the backplane, it's a bit too tight for me to take out and confirm that the silver/grey cables are SATA, but i'd say its very likely. http://img23.imageshack.us/img23/5543/sdc111071600x1200.jpg On the cashback front I'm starting to get a little worried, not heard anything yet (posted claims form off on the 16th). Still, guess they've only had it around 5 working days so far due to Bank holidays and mail delays. Glad the offer has been extended so even if it was lost in the post I can give it another go in a week or so.