That sounds pretty good to me, for XP at least. Back when XP was the latest OS, I had a single-core PC. My current one seems decidedly below average, but it does the job, and I know bugger-all about computers anyway. According to the control panel thingy, these are my specs: HP Pavilion dv6 Notebook PC AMD Phenom N620 Dual-Core Processor - 2.8Ghz 4Gb RAM OS - Windows Vista Home Premium (doesn't seem any different to when I had Vista as basic)
Intel i3-2100 3.1Ghz 8 Gb RAM MSI Nvidia GTX 560 Ti Twin Frozr II HDD: 1TB Windows 7 64bit Ultimate Edition