Will this fit in an Alienware X51?

It fits Intel LGA 1150/1156 socketts. As per specs

Where do the brackets belong? On the top/face of the MB around the CPU which seems logical but doesn't work or on the bottom? Placing the brackets on the bottom works but seems dangerous to the board.

The brackets go on the back of the motherboard. Modern motherboards intentionally do not feature contact points in the zone around the CPU socket to allow for backplates and brackets. The brackets and backplates usually feature a thin rubber cushion or thin layer of adhesive to ensure the motherboard is not scratched, but neither adhesive or cushion are necessary so long as you don't wiggle or rub the bracket back and forth. This method of mounting is actually considerably superior to the push-pin method or lever method as it applies more force, more evenly to secure the cooler to the CPU. The screw mechanism also supports considerably more weight than the push-pin method, allowing for larger, heavier coolers.

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Dynatron;K666;Model Number: K666 - Dynatron Corp.

Main image of Dynatron K666 60mm 2 Ball CPU Cooler for Intel LGA Socket 1151 / 1150 / 1155 / 1156

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Dynatron K666 60mm 2 Ball CPU Cooler for Intel LGA Socket 1151 / 1150 / 1155 / 1156

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At Duty Cycle 0-20%: 1600 RPM
At Duty Cycle 50%: 2300 RPM
At Duty Cycle 100%: 5000 RPM
At Duty Cycle 0-20%: 8.5 CFM
At Duty Cycle 50%: 12.2 CFM
At Duty Cycle 100%: 26.45 CFM
Aluminum & Copper

Specs

Reviews (18)

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Learn more about the Dynatron K666

Model
Brand	Dynatron
Model	K666

Details
Type	Fan & Heatsinks
Fan Size	60mm
CPU Socket Compatibility	Intel LGA 1156
Bearing Type	2 Ball
RPM	At Duty Cycle 0-20%: 1600 RPM At Duty Cycle 50%: 2300 RPM At Duty Cycle 100%: 5000 RPM
Air Flow	At Duty Cycle 0-20%: 8.5 CFM At Duty Cycle 50%: 12.2 CFM At Duty Cycle 100%: 26.45 CFM
Noise Level	At Duty Cycle 0-20%: 13.8 dBA At Duty Cycle 50%: 21.8 dBA At Duty Cycle 100%: 38.7 dBA
Power Connector	4 Pin(PWM)
Heatsink Material	Aluminum & Copper
Fan Mounting Types to Heatsink	Horizontal

Dimensions & Weight
Max CPU Cooler Height	64 mm
Fan Dimensions	60 x 60 x 25 mm
Heatsink Dimensions	90.7 x 85.0 x 64.0 mm
Weight	500 g

Features
Features	CPU Support: Intel Core i3 i3-530 & i3-540, Core i5 i5-650, i5-650, i5-660, i5-661 i5-670 & I5-750; Xeon Processor 3400 Series; Core i7 Processors, I7-870 & I7-860

Additional Information
Date First Available	June 24, 2019

Warranty & Returns

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Item#: 9SIA2W03XT8627