well i got the system better tuned i think.i lost the sub -50 temps on no load but my load temps and chiller rate of drop have made up for it i think.system bottoms out at -38c no load but the load temps with my test peltier have gotten much better -21f (-29 to -30c ) load temps.chiller is now below 0c close to 30 minites time.and 2f (-17c ) in right at a hour.
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xp2800barton@2712 226x12 dual bank 2x256 twinmos pc3200 8RDA epox full mods.vdd,vdimm,vcore.
custom r502 cooled unit.CPU running @-18C GPU -21C Chipset -20c
only one like it.in one case.
custom r502 cooling unit
3D2001SE 21315
3DMARK03 6659