8GB Kingston KCP313NS8/4 (4GB X 2 sticks) DDR3 1333MHz Non ECC RAM Memory DIMM | eBay
Which RAM Is Faster? -- Two 4GB Sticks Of RAM Or Four 2GB Sticks Of RAM
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]
A-Tech 8GB KIT (2 x 4GB) For Acer Aspire Series 7741G-6480 7741Z 7741Z-4433 7741Z-4485 7741Z-4641 7741Z-4839 7745-7949 7745G (Quad Core) (4 Slots) 77. SO-DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory at Amazon.com