Been lurking for a while, but wanted to share some Nov Jupiter experience in case it helps someone.
I have a Mercury and received a Nov Jupiter last night. I had the Mercury on a "Rosewill 650W 80 PLUS BRONZE Certified Power Supply Hive-650" and bought a "XFX PRO1000W" for the Jupiter. However, the XFX would shutoff after a couple minutes when running the Jupiter. The solution I found that worked was to plug an extra PCI-E cable from the Rosewill into one of the ASIC boards on the Jupiter. This has kept me happily hashing on the P2Pool at close to 800GH/s (Mercury + Nov Jupiter) ever since.

I am not a hardware guy, so I'm not sure what's going on. I assume the 1000W wasn't enough for the Jupiter, but that doesn't sound right given what everyone else is writing.
FWIW, the fans were all attached on the Jupiter when I received it. The box was shredded, but the miner was in much better condition than the Mercury.
[Edited to clarify how the 800 happened.]