CryptoNight can be mined on GPU and CPU but specifically yes it is one of few algos where, although GPU will get you better hashrate, it is "ASIC resistant" and so GPU doesn't get a huge advantage. For example mining Monero I get 210 h/s on my CPU and 420 h/s on my GPU.

Use a program like cpu-z to check how much L3 cache you have on your cpu, the higher that is the better hashrate you'll probably get, CryptoNight requires lots of memory and that's how it remains ASIC resistant.