Really interested in the idea of external GPU. I am crunching on a desktop with Twin GTX-580's with sealed liquid cooler; but I also have three laptops which crunch (CPU only, 60%). I do not have Thunderbolt, just USB2.0 on thee machines.

When I brought on the desktop with GPU's, I went from about 11,000 credits per day to between 150,000-180,000 per day. So, you can see that depending on the money cost, anything that I could do with one or two of the laptops with external GPU could be helpful.

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I've found a product that claims to do that:

http://www.newegg.com/Product/Product.aspx?Item=N82E16815158162

I've found nothing on whether it has adequate bandwidth for a reasonable credit level, or whether it is even compatible with GPUGRID workunits at all.

I've found a product that claims to do that:

http://www.newegg.com/Product/Product.aspx?Item=N82E16815158162

I've found nothing on whether it has adequate bandwidth for a reasonable credit level, or whether it is even compatible with GPUGRID workunits at all.

This too might work:
http://www.netstor.com.tw/_03/03_02.php?ODI=

This too might work:
http://www.netstor.com.tw/_03/03_02.php?ODI=

They have since been superseded by these,
http://www.netstor.com.tw/_03/03_02.php?OTc=

If you only have a laptop the NA211A-GPU(NB) looks like the best solution (5Gb/s),
or the NA211A-GPU(DT) if you want to extend a micro desktop (20GB/s).

Their limitation is the PCIE slot you plug into, rather than the PCH's PCIE2.0 X4 bandwidth limitation of 2BG/s, which is why Thunderbolt woouldn't be a feasible solution for a high end external GPU; if I understand it, you would actually be limited to 1.5GB/s or 2GB/s (and that's when it matures and if such products become available).

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I'm crunching with an ASUS G55 laptop (GEFORCE GTX 660M). Overclocked and all it runs below 80C (CPU is busy crunching WCG, so it also generates heat).

This is what I call efficient cooling.