I also tested the temperature of X1900XT with ATI stock cooler,AcceleroX2 and VF900Cu by 3D marks 06 and recorded the temp result by riva tuner 15.8(unlocked support for X1900)
Just give you guys a result summary
ATI stock cooler(5060RPM) at X1900XT Full load: 69-70C
AcceleroX2(2100RPM) at X1900XT Full load: 65-66C
VF900Cu(2600RPM) at X1900XT Full load:75-76C
I come from Guru3D forum and we also noticed the VF900Cu problem review from sudhian.com by Tuan Huynh.
We concluded that the review is actually nothing more than a product promotion exercise.
FYI: other Vf900CU owner also recorded 69C in X1800XT, we had posted our temp log file for your reference.
http://forums.guru3d.com/showthread.php?t=176582
http://forums.guru3d.com/showthread.php?t=176760