I have one doing 434 (3.5*124) on a BH6 using NEC cas3 pc100 ram. Seems pretty stable. So it may not be easy, but it is possible (by the way-- removed stock heatsink/fan-replaced with gargantuan hs/dual fan. Left cartridge intact though) Good Luck
[This message has been edited by jdebris (edited 07-25-99).]