640MB in my whitebox P-75, with 8MB of RAM.
We later added a 1 GB drive and upgraded to 40MB of RAM.
Then in 1998 we got our whitebox PII-350 with 64MB of RAM, and an 8GB hard drive, which I added a GeForce2 MX, and another 64MB RAM.
Then in 2002 we got our Dell, P4-1.8 (Before Northwood...whatever the core was called.) With a 40GB hard drive and 256MB of RAM and a GeForce3 Ti200, on which we added another 256MB. My family still uses that today, hard to believe it's nearing 4 years old!