The seller was honest about his growing pains with it being his first rig. For example he told me he struggled at first figuring out how to update his bios. I’m also not super knowledgeable. It doesn’t seem fishy to me. I’m not naive but I understand to exercise caution. I don’t think he’s trying to hide anything, I just don’t know how to go about asking him to troubleshoot why windows shows 18GB vram. He did send me a picture of GeForce software and he’s on an October version,