it depends on card manufacture as well, the manufacturers try everythign to cut down the cost of the final product, where they find a good fan for say 2$ and a below normal quality fan for $1.80, they obviouisly willl went for low quality saving them with 20 cents per fan. they could have their fans designed from reputable fan manufactures like Thermal take, akasa, coolermaster (they are into research), but even if you see the card from highest quality manufacturer, you find any of these names on them, as they know, that same fan that can be found in market for 2.00, they'll manufacture it for 2.50. I have seen myself fans getting failed even on highest quality card manufacturers.
Intel Core2Quad 2.66Ghz 12MB L2-Cache
4096MB DDR Kingston Hyper-X
XFX 9600GT AlphaDog
Seagate 2 X 320GB SATA2
LG L246WH Flatron 24"