What follows the T series?

See here:

http://www.roberthancock.com/dell/

In addition, some of the Dell Optiplexes can use the Tualatin and faster PIII Coppermine processors

Not on the desktop. For that, you'd need to look at the PowerEdge servers (like the PE2500).

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@asur wrote:

From the specs page, the T series is slot 1 only. I see the B series has socket 370 models, but it has RDRAM. And I see the 4100 is socket 370, but it can't take ECC memory. Are there any Dell models which can use the fastest PIII processors?

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The T Series is an INTEL OEM'd SE440BX2 Motherboard. Compatable with the Powerleap IP3-T 1.4ghz tualatin.
The 4100 is an INTEL OEM'd 815EEA Motherboard. Compatable with a 1.0Ghz Pentium3 and Tulatin with LIN LIN adaptor or something like that from powerleap.

The B series uses the INTEL 820 chipset with the RDRAM I think. I dont have one so I cant pop it open
to see.

The Fastest Coppermine vs tualtin? Not sure what you mean by the fastest Pentium3's

Fascinating. The PE 2500 is certainly a hefty PC. I looked over the roberthancock.com/dell list. I checked some of the OptiPlex models. Of the latter, the GX240 seems to be the closest to what I'm looking for: 100 or 133 MHz ECC-capable SDRAM or DDR SDRAM, in a minitower case. The PE 2500, with its 300 W power supplies, and multi-SCSI capability, etc, is too much machine for the intended use. It's interesting that there doesn't appear to be a high-end P3 analog to the GX240. Or is there?

The late stages of the P3 will never go down as Intel's finest hour - by then Intel had made its fateful pact with Rambus, which turned out to be a disaster as far as the Intel 820 chipset was concerned - that was supposed to be the successor to the 440BX at the high end of things - too high end, it turned out, as Rambus couldn't deliver in time, and prices were too high.

VIA captured most of the market for Tualatin P3 chipsets, Intel was stuck with extending the low-end 810/815 chipsets to stay afloat on the desktop - which locked out ECC RAM and server use. ServerWorks took the server chipset market (as with the PE 2500 and following models).