The max rpm is: 2200@ 2200rpm the fan delivers ~ 32 CFM and has 17.7 dB(A)As this fan uses PWM function the min rpm is 450rpm.There is a speed adapter in the scope of delivery in case you like to drop the max rpm. In this case the max rpm would be 1750rpm.

What connector does this have? Nothing listed or shown.

PWM implies 4-pin and indeed it has a 4 pin connector

I'm running an older dell i7 3770. 77 watt. this fan is the same size as my cpu fan. i have an adapter to go from the mb to a pwm fan. will this work?

Most Dell systems use a proprietary 5-pin fan header. In order to make it work you'll either have to modify this header or buy a special adapter to make it work with Dell motherboards

Does it come with Molex adapter / Can I connect it to the power supply instead of to the mother board ?

You can connect it directly to the power supply. It doesn't come with a MOLEX adapter and I'd just pick up a generic one here on Amazon instead of opting for a dedicated 3 or 2 pin fan. Here's why: Today you may want to run it directly off the Power Supply, but down the road you may want to connect it to a 4-pin fan header and then you'll have to buy another fan if you opt for a dedicated 3 pin or 2 pin fan now

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Brand	Noctua
Power Connector Type	4-Pin
Voltage	12 Volts
Cooling Method	Air
Compatible Devices	Desktop
Noise Level	17.7 dB
Maximum Rotational Speed	2200 RPM
Air Flow Capacity	55.5 CMPH
Global Trade Identification Number	04716123315476, 07038557222364
Manufacturer	Noctua
Item Height	25 Millimeters
Item Width	8 Centimeters
Product Dimensions	8 x 8 x 2.5 cm; 220 g
Item model number	NF-A8 PWM
Computer Memory Type	DIMM
Are Batteries Included	No
Lithium Battery Weight	245 g
Number of Lithium Metal Cells	1
Item Weight	220 g

Noctua NF-A8 PWM Premium 80mm PC Computer Case Fan

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