If they have DDR3 RAM, I personally wouldn't use them Strictly for performance understandings. This being they would struggle to keep up with any more modern chip you can get that does support DDR4/DDR5 for a decent price.

That being said, if you need a server to run some basic tasks. You could do worse, but I wouldn't say I suggest it.

If I were using that site personally and looking I would look more towards the HP DL380 G9 for about $500. But anything from that site is going to SUCK when it comes to sound. Not something you want in a room where you want it to be quiet. Mine is in my office and makes a decent but not unbearable sound.

In short: no. In longer: hell no.

Jokes aside, everything that comes with a Xeon L is ancient and will draw a lot of power for not very much performance. In fact, I think your i3 might be more powerful than those R610.

Those R620 may still be ok, but they are also getting really old now. They will be very noisy - if you haven't run a server like those at home, you'll be surprised how loud those are. Imagine a vacuum running constantly in your room. That noisy. You can't do much about that, they simply need a ton of airflow, so more quiet fans would most likely lead to overheating.

For your use case I would simply go with a used desktop (not the tiny ones, a regular sized one), add a HBA for more drives and call it a day. Those are cheap, roughly 70-80€ for a used 7th gen i5. The bigger ones might even be cheaper because most people want the sff or tiny versions. A used LSI HBA with IT mode may be another 30-40€ or so. That system will sip power and most likely won't be audible. If it is, swap in silent fans and done.

If you do want a rack mount, ipmi, and so on, I'd go the diy route with a Xeon e3 v5/6. Gen system. Those are plenty powerful and don't draw too much power. Downside is they mostly exclusively use ECC UDIMM which is rather rare and expensive in the used market.

Bottom tier spec, noisy, power hungy. Most seem to take 2.5" disks and one takes 3.5" disks, you need to find disk rails and disk controller may not be happy with consumer sata disk unless you were planning to buy brand SAS disks.

Fans in those are quite small and need to push lots of air trough, I don't see how to make them quiet easily, fan headers are propietary and sizes most likely are not standard.

If you need to cheap out, then maybe some aliexpress mobo with used xeon + ddr3, hba card and standard atx tower etc.

Those aren’t worth it imo. Those specs are pretty bad for the price. As someone who has a server like that (although newer specs), it is pretty expensive to run, sitting at between 100-200$ a month in electricity if run non-stop, granted I live in an area with higher-than-average electricity prices. Taking out 1 CPU will be negligible on power, but have drastic impact on performance. Another consideration is storage, which will be expensive with enterprise 2.5” drives, so be aware of that. Fans in dell servers (or at least the one I own) tend to be quiet if configured to use low fan speeds when under low load. I used to have one in my dorm room under my bed, and I could barely hear the fan whine when trying to sleep, but I could drown it out with a box fan or quiet music