We have been using a new measuring device for some weeks now, so you cannot compare those results with former test results. The good performance result of WD's WD400 drive has to be paid with a high idle noise level. The situation is different with the Fujitsu drive. Even though it is not far away from the WD400's benchmark results, it makes clearly less noise.
The WD drive reached a surface temperature of 42°C after almost two hours - that very acceptable for a 7200-rpm drive. You should add some 5-10 extra degrees, as I attained those results having the drive running on my desk.
The Fujitsu drive stays absolutely cool at 37 degrees - excellent.