I rate Cisco USC C-Series Rack Servers 10 out 10. If you plan to buy a C-Series, you should be clear about why you want to use it because the uses vary. different. Whether you're using Cisco, HPE, Dell or any other brand, it's essential to define your use case. For example, are you using it for a simulation graphics, calculations, etc.? Depending on the use case, you might want to go with a small server with more CPU. Sometimes you need a light CPU with a powerful GPU. For example, if we have a C-Series with four CPUs at the same time, or we have a server that's handled two CPUs at the same time—the purpose is crucial. C-Series is good enough compared to other competitors like HPE and the other ones. The HPE C20 is one unit and has a lot of RAM support, but the C-series is number one, in my opinion.