I've had two Dell Optiplex GX1 desktop machines for a while that I have been wanting to upgrade and finally found two of these with 1.4ghz P-III's installed. Not Celerons like you usually see, but the far less common desktop variant of the full P-III. There are several steppings for the 1.4ghz P-III and all but one are designated for server use only and can't be used in a consumer level desktop. These P-III's are actually better performers than the early Willamette P4's and the comparable Athlons running at the same clock speed.
The "Tualatin" Pentium III-S chips work just fine in desktops. They were always my preferred chip, as they support both dual-socket use as well as have double the L2 cache as the desktop-oriented chips. And by that point, the Pentium III-S was more common than the desktop-oriented Pentium III-D, because the 'desktop' had largely converted to Pentium 4 or Celeron. (There were three S-specs of P3S at 1.4 GHz, only one of the P3D at that speed, and the second-stepping of the processor core was only released on the S-variant.) But the 'server' chips work wonderfully in desktops. It's just that by the time of the "Tualatin" chip's release, there were few new 'desktop' Pentium 3 board being released. With a slotket, though, (or Powerleap's socket-to-socket Tualatin adapter,) the server chips worked just fine in desktop board. (I'd still love to find a dual-Tualatin-supporting motherboard with the 840 chipset. That would be the ultimate late-2000-era PC desktop. A dual 1.4 GHz P3 would blow the pants off any 2.0 GHz P4 system, and even come close to some of the early P4-based Xeon systems, at much lower power consumption, to boot.)
