David J Taylor
A RAMdisk is essential with the TelliCast 2.4.4 client for receiving both Metop and other data, and I have written some suggestions here:
There are a number of excellent, free programs available. I would normally recommend a 300MB RAMdisk.
I have a couple of systems here which, on a single PC, both receive and process Meteosat-9, EARS AVHRR and Metop AVHRR data, essentially without loss. One is an AMD system with an AMD-64 X2 4400 processor, Windows Vista-32, and 2GB of memory (also running SBS Virtual Radar and Plane Plotter), and the other is a more recent system with an Intel i5-760 processor, Windows-7 64-bit, and 8GB of memory. As it happens, both those systems are running an unreleased TelliCast 2.5.17 client, and are working without a RAMdisk, and with USB receiver boxes (Dexatek on the AMD and DVB World on the Intel, in case it matters).
So although EUMETSAT and I both recommend a two-PC setup (the receiver PC can be a lower-powered Intel Atom box running 24 x 7) a well setup up, single PC with a multi-core processor and 2GB+ memory can likely do the job you need.
SatSignal software - quality software written to your requirements