What’s your budget and speed requirement? A quad-CPU Xeon E7 v4 server (Supermicro X10QBI, for example) with 1TB of RAM gives you ~340GB/s memory bandwidth and enough actual memory to host a full DeepSeek instance, but it will be relatively slow (a few tokens/s max in my experience). Up front cost a bit under $1k, less if you can source cheap 32GB DDR3 RAM. Power consumption is relatively high, ~1kW under load. But I don’t think you can self host a large model cheaper than that.

(If you need even more memory you could equip one of those servers with 6TB of DDR3 but you’ll lose a bit of bandwidth if you go over 2TB. DDR4 is also a slightly faster option but you’re spending 4x as much for the same capacity.)