What are you trying to optimize for? Solely the initial cost of hardware? Power consumption? Is there some performance target, task that needs to complete in

What are you trying to optimize for? Solely the initial cost of hardware? Power consumption? Is there some performance target, task that needs to complete in X minutes, etc? For example, I might suggest buying used Lenovo Tiny M75q's on eBay. The Ryzen 3400GE is significantly slower than your Ryzen 4500, but also lower TDP and very cheap procurement cost. Also fits your "smaller the better" wish. No ECC, though.