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G.SKILL 16GB (2 x 8GB) TridentZ Series DDR4 PC4-32000 4000MHz Memory Desktop Memory Model F4-4000C18D-16GTZKW at Amazon.com
G.SKILL 16GB (2 x 8GB) TridentZ Series DDR4 PC4-32000 4000MHz for Intel Z170 Platform Desktop Memory Model F4-4000C19D-16GTZ at Amazon.com
Kingston Fury Renegade 8 GB 4000 MHz DDR4 CL19 Desktop Memory Single Module KF440C19RB/8 at Amazon.com
Patriot Viper 4 Blackout Series DDR4 16GB (2 x 8GB) 4000MHz Kit (B07TWJ42VQ) | Amazon price tracker / tracking, Amazon price history charts, Amazon price watches, Amazon price drop alerts | camelcamelcamel.com
G.Skill Trident Z Royal Series - DDR4-16 GB: 2 x 8 GB - DIMM 288-PIN - ungepuffert at Amazon.com