Hi,
I would throw in a word of caution on graphics cards at the moment...
I have a desktop PC, so the Laptop problem faced by Alexba doesn't apply (Very well documented elsewhere).
I have a Ryzen 2700X, over-clocked to 4GHz and water-cooled.
I run windows and all programs from a fast SSD - Just makes the PC generally quicker to boot and work with.
I have a 'Working files' drive - also SSD - Just to keep my working files away from the main archive drive. (Not really needed).
I tend to write rendered files directly to a 'Spinny disc based' large hard drive.
As SoNic67 advises, there's no problem with writing to a modern hard drive - they're capable of writing faster than the files will be rendered. They slow nothing down.
I have 32 Gb RAM, though I reckon I'd see no real-world problems if I only had 16Gb - even if running PD in the background, letting it render as I work on other stuff - which I tend to do.
One problem that's just popped up - documented in another post and currently under investigation.
I have a Nvidia Geforce GTX 1070 8Gb graphics card. (I think mine is an ASUS, but I'm going back a couple of years since built).
This runs like the clappers in PD18, it is correctly 'Optimised' in the preferences/Hardware acceleration window.
However - I'm noticing some glitches with regard to smooth movement when utilising the power of the card. Switching it off and rendering far slower is giving me better finished videos...
I'm hopeful that there will be an update soon that will fix this (Very common card) as just now, I couldn't recommend such an expensive card for use with PD-18.
Gerry