[citation][nom]jprahman[/nom]Sounds like a great way to breath new life into an old P4/Athlon 64 machine. However, at those prices it may not be worth it.[/citation]
40 and 60GB seem like a good investment for an old pc.
Remember back in those days (the days of the IDE where the days of Windows 95, NT, 98, 98e, milennium, and 2000) a harddrive of 40GB would cost as much as this ssd. Later in the windows XP era, drives had larger capacities, but you will want compatibility with FAT32 formatting table without partitioning the drive.