Just toying around with my latest dedicated physx card. The other physx cards that I have is a Agiea ppu pci, 8800gt, and a 9800gtx so I decided to pick up a zotac gt430. Yes it is much weaker than all but one of my other physx cards but what made the gt430 of interest was physical size and very low idle load when not gaming.
About the card was the model that has the black pcb with the dual phases for the gpu for power while one phase for the vram. Average load with Fluidmark on the memory controller only averaged around 16-17%. Gpu load around 65-75% but usually 70%. Temps stayed in the high 50s. The only mods to the card was three enzotech or swiftech vramsinks. One on each phase for stability and generally lower temps.
The gpu remained partly stable at 911mhz while only crashing once. The vram can go up to 954mhz but isn't stable for long but set to 920mhz it is rock solid.