None that I know of. The 3 ECS boards that I looked at, the K7VTA3- VIA266A, K7S6A, and the K7S5A (Sis735), have firmware to detect CPU voltages. FSB and Memory can only be set to either 100 or 133MHz.
You might have a look at the Epox 8KHA+ 266a and the Soyo K7V Dragon PLUS, to mention a couple. Supposed to be an overclockers dream. The Soltek 75DRV2&4 are also good, but with those you'll have to make more manual adjustments via jumpers.
Ed