I'm no expert on these gaming laptops, but from what I find on the web this is an older Intel Haswell architecture (Core i7-4710HQ) which is a soldered on CPU module (FCBGA1364 socket is a PGA solder on setup) [https://www.intel.com/content/www/us/en/products/sku/78930/intel-core-i74710hq-processor-6m-cache-up-to-3-50-ghz/specifications.html|Intel Core i7-4710HQ Processor spec]
In reviewing the specs of the system from here: [https://laptopmedia.com/series/asus-rog-g771jw/|ASUS ROG G771 Specs] this system only supports 12GB of RAM but does have a M.2 slot which can allow you to upgrade the on system storage.