what are the most important factors to consider
CPU:
Higher clock speed (4 - 5 GHz)
Large L3 cache (32-64mb)
Most CPUs come with at least 4 cores these days which is plenty for a RIP only station. If you plan on using it to RIP and print to multiple machines at the same time or the
computer is being used to design and run other equipment, more cores helps
A decent CPU cooler or water cooled helps
Memory:
16 - 32+GB, Higher is better if you do large banners, wraps, or run multiple machines
Memory speed doesn't matter as much with RIPs. If you can get DDR4 cheaper than DDR5 and add more GBs, that's preferable
Storage:
NVMe Drive of whatever size you think you need for your volume of output. Some people get an old HDD or SSD for longer term storage but go with an NVMe for the main drive that will be doing the RIPing
Video cards don't help RIPs. So don't go out and get a 5090 or anything.