iPhone XS and XS Max Have 4GB of RAM, XR Has 3GB; XS Max and XR Have Larger 3,174 and 2,942 mAH Batteries - MacRumors
Apple Iphone Xs Max A12 Bionic Mobile Phone 6.5inch 4gb Ram 64gb/256gb Rom Hexa Core 12mp Nfc 4g Lte Original Ios Cellphone - Mobile Phones - AliExpress
Apple iPhone XS Max Unlocked 4G LTE - Space Gray (Remanufactured) Smartphone; GSM; 4 GB RAM/64 GB Storage; 6.5'' Liquid - Micro Center
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Apple iPhone XS Max Unlocked 4G LTE - Space Gray (Refurbished) Smartphone; GSM; 4 GB RAM/512 GB Storage; 6.5'' Liquid Retina - Micro Center
How to Clear the RAM on Your iPhone XS, XS Max, or XR to Fix Problem Apps & Boost Performance « iOS & iPhone :: Gadget Hacks