CPU Requirements for Windows 2000

Will a Celeron 333Mhz and an AMD K6/2 400Mhz work well with Windows 2000 Professional? All of my systems running Win 2000 Pro have at least a PIII 500 Mhz processor. I would like to upgrade about 4 PCs to Win 2000, but they have slower processors and I am not sure how well that would work. Thank You.