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Dell Alienware X51 R2 Desktop Series CPU Fan with Heatsink 7C20C WKGR1 Used - Walmart.com
X51 R2 CPU Cooler Upgrade and GTX 970 Success - Dell Community
How To Clean Alienware X51 R2 Dirty Fan | Clogged up Fan | Replace Dried CPU Thermal Grease - YouTube
X51 CPU Cooler Solution and GTX 970 - Cooling - Linus Tech Tips
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CPU cooler replacement and shroud mod on X51 R2 : r/Alienware
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NEW Alienware X51 R1 R2 R3 CPU Heatsink with Cooler Fan 07C20C 0KN1NP 0WKGR1 894586237550 | eBay