Just throwing this out in case anyone can give an insight.
This host seems to occasionally get stuck.
Thanks guys! Just wondered if there is any particular explanation or remedy.
Keep Crunching!

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"The most exciting phrase to hear in science, the one that heralds new discoveries, is not Eureka! (I found it!) but rather, 'hmm... that's funny...'" -- Isaac Asimov

Anti-virus doing a run in the background.

I notice that you have a GTX 260 paired with the C1060 so does it have enough ventilation to keep it cool?

In other words do you have a free slot space between both cards?

Have you checked to make sure that the heatsink isn't full of dust?

Have you tried swapping those cards from 1 PCI-e to the other?

Cheers.

No Anti-virus on that machine. Yes, they have a space between them. Could definitely be heat related but they seem to purr along pretty cool. 58-60c average. I was interested if there is anything about those certain tasks that could explain why those ones. No invalids just seems to get stuck about once a day. *scratches head*
I will swap them out for new cards eventually, just thought I would try to keep the old beasts going as long as they worked. :)

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"The most exciting phrase to hear in science, the one that heralds new discoveries, is not Eureka! (I found it!) but rather, 'hmm... that's funny...'" -- Isaac Asimov

What version of bios are you running? What is the wattage of the PSU? How much Ram per C1060 is there. Some bios may require as much physical Ram as Video Ram. Sorry, just saw your post from 2009...I'm assuming its in a PCI-e x16 gen 2 board? From the articles you listed anything less would cause a bottleneck. Your power mod, they are grounded together? yes? ok..that's all I got...