hey Pete, I have the same set=up. I was using a volcano 7+, switched to a Vantec Aeroflow, temps dropped from 58c to 53c underload. Been running 53c for about 2weeks now, no problems. I have 2 intake, 2 exhaust, 2 fans on the PSU, aluminum case and still could not keep my xp1700 under 53c with a load, so not to worry!
hukilau