Just tried RD 1 and 2 on my 4000 and no problems here whatsoever. Same as fitzsteve, no additional tweaks in tooltypes for it to work.
4000 with 16Mb on the main board, 040@25Mhz and whdload 18.
4000 with 16Mb on the main board, 040@25Mhz and whdload 18.