Spoke to someone at ProSeries Support and they confirmed with their "tech" specialist that 1.8GHz with quad cores will be fine.  I'm looking at the HP Pavillon with 8th generation i7 chip (1.8GHz, up to 4 GHz, 8MB Cache, quad cores), 16GB memory, 512GB SSD.  So even though it's 1.8GHz it can speed up to 4 GHz.  My 8 year old Dell laptop with a 2nd generation i5 chip with dual cores and 2.4GHz has gotten really slow and tends to overheat if I have too many windows open plus it's on Windows 7 so it's time to get a new computer.  Trying to stay under $1,000 because I will need to buy Office Home & Business (don't want the subscription service). I just don't want to buy one that I'll regret.