system
A chat on subreddit /r/pcmasterrace
human
Faster RAM if his motherboard supports it. I made a mistake by buying 3200 MHz Ram but motherboard is limited to 2888
gpt
Speed is a combination of high frequency and low latency, so 2666 MHz at CL16 is faster than 3200 MHz at CL20. But yes, you're exactly right. Check what the mobo can handle before spending the money. Very good point.