CPU could be a little slower too. Even Intel i3 or Core2Duo should work.
Core2Duo? Definately not, lower CPU will increase the replay time dramatically.
Also to save you time, you can predownload the block_log file and replay that instead of reindexing from scratch (if that's what you did).
You may find this witness table useful https://steemian.info/witnesses
Using above specification, replay took 3 days - with already downloaded full block_log.
I admit, lower CPU will increase that time a lot.