I was looking for fan model KSB0505HB (641839-001) made by Delta Electronics Inc. Although the fan I received is branded Sunon (model K3312K) it seems to be a close clone of it. I removed the old one and installed this fan without trouble and it works fine in my hp EliteBook 8460p laptop. It arrived sooner than I expected (2 weeks since I bought it) and the packaging was excellent.
Replaced the original fan of an old HP Elitebook with one of these. The fan is working fine but It gives me an error message at startup. (fan not working correctly) However, my HP as been running for a week with it and all seems to be fine. Maybe the problem is somewhere else.