Re: [ANN] cudaMiner - a new litecoin mining application [Windows/Linux]
Here's something that baffles me:
I used to mine just with my GTX 660 Ti, then I remembered I still had a GTX 275 lying around, so I built that into my rig as a 2nd card to see what kind of performance I would get. In theory the GTX 275 actually isn't that bad despite its age, here are some numbers from Wikipedia, quickly edited together:
The GTX 275 has 41% of the compute power and 88% of the memory bandwidth of the 660 Ti.
I used to get around 200 khash/s with the 660 Ti even with version 2013-12-10 (now improved to ~280
). So even judging from the old 200 khash/s, I should be getting at least 80 khash/s with the GTX 275, right? Nooope... 50 khash/s. 
I'm using K7x32 (thanks Christian!) for the 660 Ti and L60x3 for the GTX 275, which is the setting consistently picked by auto tuning. The other settings are "-C 0 -m 1 -H 2 -i 0", all tested and proven to deliver the best performance I can get on both cards.
Now to get to the point: Why is the GTX 275 that slow? Is it just because it only supports CUDA 1.3? Any tips on how I might get some more performance out of that old piece of crap?
I used to mine just with my GTX 660 Ti, then I remembered I still had a GTX 275 lying around, so I built that into my rig as a 2nd card to see what kind of performance I would get. In theory the GTX 275 actually isn't that bad despite its age, here are some numbers from Wikipedia, quickly edited together:
The GTX 275 has 41% of the compute power and 88% of the memory bandwidth of the 660 Ti.
I used to get around 200 khash/s with the 660 Ti even with version 2013-12-10 (now improved to ~280
). So even judging from the old 200 khash/s, I should be getting at least 80 khash/s with the GTX 275, right? Nooope... 50 khash/s. I'm using K7x32 (thanks Christian!) for the 660 Ti and L60x3 for the GTX 275, which is the setting consistently picked by auto tuning. The other settings are "-C 0 -m 1 -H 2 -i 0", all tested and proven to deliver the best performance I can get on both cards.
Now to get to the point: Why is the GTX 275 that slow? Is it just because it only supports CUDA 1.3? Any tips on how I might get some more performance out of that old piece of crap?