Don't be too impressed with the CPU cooling in the Dimension 4100. I have that case and I'm very disappointed with the cooling. I admit that their idea was intriguing but the way they implemented it, it just doesn't work out that well. The main problem is the way that the fan is connected to the case. It just snaps in, and not very securely at that. The fan rattles against the case and the cover just acts as an amplifier, as well as it rattles against the fan. All that turns into a very loud design. It also means that there's not a ton of cooling in this case. I haven't been at all satisfied, as soon as I get the money to migrate out of it, I'm done.