When just recording the processing requirements should not be that high. Most of the processing requirements for an HTPC are for the MPEG2/4 decoding and that's only needed when viewing.
I/O bandwith might become an issue at some time, especially if all those streams are sharing the PCI bus.
So the more of those tuners are PCI Express, the less issues you can expect.
You might want to have a look at mythtv. You could try to set up your box with 4 tuners as master and run different clients when you want to view. |