OK, I ran through an hours worth of Call of Duty 4, frequently checking the video card temp. I also ran 3 different video stress programs that are, by design, supposed to load the video card with all it can handle. I ran all tests at 1680x1050, 4x aa and all settings on high. None of the tests, so far, is a match for the 4870. It is an awesome video card.
The results were all the same. Rarely did the 4870 exceed 49.5 Celsius. A couple of times it hit 50, but only stayed at that level for a matter of a few seconds. This is a drastic change from the 52C idle and 70 load temps I was seeing with the stock cooler, (@40% fan).
As far as I'm concerned, the Thermaltake HR-03-GT is worth every penny I paid for it.
I have one more test to run and that is Crysis. I anticipate that the temp may rise a bit more than I've seen so far. But nothing like the temps I was seeing before I installed the vga cooler.