I bought a new graphics card and memory modules. I bought a new graphics card and memory modules and installed them. The performance of graphics operation is improved. The subscores of Windows Experience Index Score are "Graphics : 7.4", "Gaming graphics : 7.4." The subscores are upped 0.8 point both from former subscores. I don't play any high-load game, so it's good enough. On the other hand, I raised memory capacity to 24GB max, because I could buy memory modules cheap. Yes, it's enough.