For each node you’ll need the following:
- 1 CPU core
- 2GB RAM (4 is better, if possible)
- 25Mbps network link
PCIe bandwidth is greater than what 4 SATA drives need so I think you’ll be fine, just make sure to pick a good adapter. You also need a SSD (NVME is better) to store the databases and caching. And don’t forget a good cooling for your system so everything can run smoothly.
Welcome aboard!
Take a look here, you may get some great ideas
https://forum.storj.io/t/post-pictures-of-your-storagenode-rig-s/1422/1056