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Kingston KVR13N9S8/4 (4GB x 2) 1Rx8 PC3-10600 8GB Computer RAM Lot of 2 | eBay
PC3-8500 4 GB RAM Chip
Amazon.com: Waveshare Accessory Compatible with Raspberry Pi 4 Model B 8GB RAM with Powerful Processor Faster Networking Support Dual 4K Output and Different Choice of RAM Comes with a Copper Heat Sink :
Can I Use 4GB and 8GB RAM Together? [Read to Know]
Kingston 8 GB Kit (2 x 4 GB) 667MHz DDR2 Server Memory KTD-WS667/8G at Amazon.com