I'm purchasing a new desktop on Dell. My only options for graphics cards are AMD Radeon HD 7570 1GB GDDR5 (which is not supported by GPU Grid) and a $50 upgrade to the following for NVIDIA:

NVIDIA® GeForce® GTX 645 1.0GB GDDR5

I do not see this card listed in either the "most recommended" or the "recommended" lists.

Will this work with GPUGrid? I searched the forums & could not find any reference to the card.

http://www.gpugrid.net/forum_thread.php?id=2507

This is an OEM card. You can find its specifications here.

I'm pretty sure it should work with GPUGRID, although it doesn't appear in the list of CUDA GPUs by Nvidia. Others may be able to shed more light on this, e.g. skgiven.

Performance-wise, I tried to compare its specs with those of the GTX 650, since they appear to be next to each other, at least judging by their names. They don't compare in a straightforward way, however. While the 645 has more CUDA cores, its memory bandwidth is significantly lower than the 650's. Have a look yourself.

Since memory bandwidth appears to have significance for GPUGRID, I expect the 650 to perform better. The 645 should not be far behind though.

Just my 2c, I hope I'm not wrong. Please wait for more feedback before you make your purchase!
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Thank you both for your replies! I am going forward with the purchase and hope it works out fairly well on GPUGrid. I haven't been able to participate here for a while.