The seller is good, sends out quickly, it came quickly. I changed the fan in the block Chieftec GDP-650c (650W), everything worked. The fan is spinning not very quietly, but also not very loud. You can use it. One drawback - the plastic of the fan base is rather fragile. When the fan was screwed on, two bolts scrolled and went away, the fan could not be held by them, and we had to additionally use ties. In general, I am satisfied with the purchase.
tested 24V BB version, works, also with PWM controller, the quality is fine for the price