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G. Skill Trident Z RGB DDR4 4000 MHz Memory Module Memory Modules Black Black 2 x 8 GB (16GTZR) at Amazon.com
Amazon.com: G.SKILL 16GB (2 x 8GB) TridentZ RGB Series DDR4 PC4-32000 4000MHz Desktop Memory Model F4-4000C17D-16GTZR
Patriot Viper Steel DDR4 16GB (2 x 8GB) 4000MHz CL 16-16-16-36 UDIMM Low-Latency Gaming Memory Kits - PVS416G400C6K at Amazon.com
Thermaltake TOUGHRAM RGB DDR4 4000MHz 16GB (8GB x 2) 16.8 Million Color RGB Alexa/Razer Chroma/5V Motherboard Syncable RGB Memory R009D408GX2-4000C19A at Amazon.com
KLEVV Bolt XR 16GB kit (8GB x 2) 4000MHz Gaming Memory DDR4-RAM XMP 2.0 Non-RGB Extreme Performance Overclocking at Amazon.com
Thermaltake TOUGHRAM Black DDR4 4000MHz C19 16GB (8GB x 2) Memory Intel XMP 2.0 Ready with Real-Time Performance Monitoring Software R017D408GX2-4000C19A at Amazon.com
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Kingston Fury Renegade 32 GB (2 x 16 GB) 4000 MHz DDR4 CL19 Desktop Memory Kit of 2 KF440C19RB1K2/32 at Amazon.com
Corsair Vengeance RGB Pro 16GB (2x8GB) DDR4 4000 (PC4-32000) C18 AMD Optimized Memory – Black at Amazon.com
Patriot Viper Elite II DDR4 16GB(2 x 8GB) 4000MHz Kit at Amazon.com