I have these two to spare ... the 610 is a PCI that fits on the same motherboard as the P3. Will the processor choke the whole thing?

Of course I am thinking of GPU work units.

it should work fine.

i have a pentium 2 machine with 2 pci gt430's was up and crunching for a while just for shits n giggles , wu's took maybe a 2 second slonger then when the cards were in my core dual machine

im thinking about getting 4 more of the gt430's to fill all the pci slots in that machine and use it soley as a gpu cruncher

also if im not mistaken the 610 has half the cuda cores of the 430 so it prolly wont run that fast

I have these two to spare ... the 610 is a PCI that fits on the same motherboard as the P3. Will the processor choke the whole thing?

Of course I am thinking of GPU work units.

As long as you leave one cpu core free to feed the gpu you should be just fine.