The official specs only mention a 1 TB hard drive so you must have added the M.2 SSD. Assuming the M.2 is an NVME you already have the best storage performance possible. You can increase the memory as high as 32 gigs (2 x 16) but installing 32 gigs would not improve performance in gaming. Increasing to 16 gb would provide a marginal increase over 8 gb in overall performance (boot time, lag) and is likely worthwhile but you will notice little if any improvement in video performance. The processor and video are soldered to the motherboard and not upgradeable.
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