Finished putting together an AMD A4-5300 based upgrade for my Aunt. May not seem like an upgrade to most, but she was coming from a 2005 vintage Athlon single core with 512mb of RAM and an onboard Nvidia chip that had never even seen a reinstall. Coming from that, any modern platform at all and 4gb of RAM is a huge upgrade.
For that matter, it felt plenty snappy to me. Even using the old hard drive and case to save money, Windows, Firefox, program installers all loaded pretty quickly. All she uses it for is Facebook, videos, and casual games for the most part. I'd be perfectly satisfied with that system as a cheap HTPC or office system.