I will install Cuda 5.5 when I get home and test again, but running individually didn't work ok for me so far.

Any tutorial on how to compile the latest source code from github ? I haven't done any C programming in ages, I am very rusty.

It was the latest version , but yes, without jane support, I didn't compile a version with it.

 I tried a version with scrypt-jane uploaded by someone else on the thread and I get :

[2014-01-17 19:32:36] GPU #0: GeForce GTX 660, 26.44 khash/s
[2014-01-17 19:33:36] GPU #1: GeForce GTX 660, 26.35 khash/s
[2014-01-17 19:33:36] GPU #0: GeForce GTX 660, 26.32 khash/s
[2014-01-17 19:34:05] GPU #1: GeForce GTX 660 result does not validate on CPU (i=1981, s=0)!
[2014-01-17 19:34:06] GPU #1: GeForce GTX 660 result does not validate on CPU (i=1810, s=1)!
[2014-01-17 19:34:36] GPU #0: GeForce GTX 660, 26.39 khash/s
[2014-01-17 19:34:37] GPU #1: GeForce GTX 660, 26.35 khash/s
[2014-01-17 19:35:36] GPU #0: GeForce GTX 660, 26.52 khash/s
[2014-01-17 19:35:36] GPU #1: GeForce GTX 660, 26.49 khash/s
[2014-01-17 19:35:45] GPU #0: GeForce GTX 660 result does not validate on CPU (i=1692, s=1)!
[2014-01-17 19:35:50] GPU #0: GeForce GTX 660 result does not validate on CPU (i=1637, s=1)!
[2014-01-17 19:36:04] GPU #1: GeForce GTX 660 result does not validate on CPU (i=1119, s=1)!
[2014-01-17 19:36:22] Stratum detected new block
[2014-01-17 19:36:22] GPU #0: GeForce GTX 660, 26.47 khash/s
[2014-01-17 19:36:22] GPU #1: GeForce GTX 660, 26.44 khash/s
[2014-01-17 19:36:26] Stratum detected new block
[2014-01-17 19:36:26] GPU #1: GeForce GTX 660, 25.87 khash/s
[2014-01-17 19:36:26] GPU #0: GeForce GTX 660, 26.08 khash/s
[2014-01-17 19:37:25] GPU #1: GeForce GTX 660, 26.46 khash/s
[2014-01-17 19:37:25] GPU #0: GeForce GTX 660, 26.46 khash/s
[2014-01-17 19:38:06] Stratum detected new block

but as you can see, lots of errors. I just tried with K20x32 :

[2014-01-17 19:47:58] GPU #0: GeForce GTX 660, 30556160 hashes, 630.38 khash/s
[2014-01-17 19:48:03] GPU #0: GeForce GTX 660 result does not validate on CPU (i=17502, s=1)!
[2014-01-17 19:48:04] GPU #1: GeForce GTX 660 result does not validate on CPU (i=4428, s=0)!
[2014-01-17 19:48:09] GPU #1: GeForce GTX 660 result does not validate on CPU (i=18108, s=1)!
[2014-01-17 19:48:10] Stratum detected new block
[2014-01-17 19:48:10] GPU #1: GeForce GTX 660, 20848640 hashes, 673.53 khash/s
[2014-01-17 19:48:10] GPU #0: GeForce GTX 660, 7475200 hashes, 618.09 khash/s
[2014-01-17 19:48:10] GPU #0: GeForce GTX 660 result does not validate on CPU (i=1735, s=1)!
[2014-01-17 19:48:12] GPU #1: GeForce GTX 660 result does not validate on CPU (i=14795, s=0)!
[2014-01-17 19:48:14] GPU #0: GeForce GTX 660 result does not validate on CPU (i=18516, s=0)!
[2014-01-17 19:48:22] GPU #0: GeForce GTX 660 result does not validate on CPU (i=18900, s=1)!
[2014-01-17 19:48:24] GPU #1: GeForce GTX 660 result does not validate on CPU (i=15159, s=0)!
[2014-01-17 19:48:26] GPU #1: GeForce GTX 660 result does not validate on CPU (i=19189, s=1)!
[2014-01-17 19:48:27] GPU #0: GeForce GTX 660 result does not validate on CPU (i=16918, s=0)!
[2014-01-17 19:48:31] GPU #1: GeForce GTX 660 result does not validate on CPU (i=8619, s=1)!
[2014-01-17 19:48:44] GPU #0: GeForce GTX 660 result does not validate on CPU (i=15977, s=1)!
[2014-01-17 19:48:45] GPU #1: GeForce GTX 660 result does not validate on CPU (i=8294, s=0)!
[2014-01-17 19:48:46] GPU #0: GeForce GTX 660 result does not validate on CPU (i=5393, s=0)!
[2014-01-17 19:48:49] GPU #0: GeForce GTX 660 result does not validate on CPU (i=17230, s=0)!
[2014-01-17 19:48:50] GPU #1: GeForce GTX 660 result does not validate on CPU (i=6325, s=1)!
[2014-01-17 19:48:57] GPU #1: GeForce GTX 660 result does not validate on CPU (i=856, s=0)!
[2014-01-17 19:48:58] GPU #0: GeForce GTX 660 result does not validate on CPU (i=1391, s=1)!
[2014-01-17 19:49:08] GPU #1: GeForce GTX 660 result does not validate on CPU (i=9682, s=0)!
[2014-01-17 19:49:09] GPU #0: GeForce GTX 660 result does not validate on CPU (i=5051, s=1)!
[2014-01-17 19:49:10] GPU #1: GeForce GTX 660, 40427520 hashes, 668.99 khash/s
[2014-01-17 19:49:11] GPU #0: GeForce GTX 660, 37089280 hashes, 606.77 khash/s
[2014-01-17 19:49:11] Stratum detected new block
[2014-01-17 19:49:11] GPU #0: GeForce GTX 660, 102400 hashes, 416.21 khash/s
[2014-01-17 19:49:11] GPU #1: GeForce GTX 660, 655360 hashes, 684.72 khash/s

Hi guys. Thank you all for your work on cudaminer , helping us with Nvidia cards a bit I've read quite a bit of the thread and I feel I am doing something  wrong here. I am using cudaminer like this :

cudaminer.exe  -i 0 -H 1 -l K5x32,K5x32 -o stratum+tcp://europe.mine-litecoin.com:80 -u user

on two GTX 660 cards :

[2014-01-17 18:38:01] GPU #1: GeForce GTX 660, 40960 hashes, 2.88 khash/s
[2014-01-17 18:38:02] GPU #0: GeForce GTX 660, 51200 hashes, 3.16 khash/s
[2014-01-17 18:39:05] GPU #1: GeForce GTX 660, 174080 hashes, 2.84 khash/s
[2014-01-17 18:39:15] GPU #0: GeForce GTX 660, 194560 hashes, 2.75 khash/s
[2014-01-17 18:39:51] Stratum detected new block
[2014-01-17 18:39:55] GPU #0: GeForce GTX 660, 102400 hashes, 2.71 khash/s
[2014-01-17 18:39:55] GPU #1: GeForce GTX 660, 133120 hashes, 2.71 khash/s
[2014-01-17 18:40:56] GPU #0: GeForce GTX 660, 163840 hashes, 2.80 khash/s
[2014-01-17 18:40:56] GPU #1: GeForce GTX 660, 163840 hashes, 2.75 khash/s
[2014-01-17 18:41:45] GPU #0: GeForce GTX 660, 138240 hashes, 2.82 khash/s
[2014-01-17 18:41:48] accepted: 4/4 (100.00%), 5.58 khash/s (yay!!!)
[2014-01-17 18:41:59] GPU #1: GeForce GTX 660, 168960 hashes, 2.84 khash/s
[2014-01-17 18:42:49] GPU #0: GeForce GTX 660, 174080 hashes, 2.89 khash/s
[2014-01-17 18:43:00] GPU #1: GeForce GTX 660, 174080 hashes, 2.92 khash/s

 I've seen people getting 70khash/s on those and others reaching 500+ on 780. Am I missing something obvious here ? At this rate I doubt I even recover electricity costs .

Hey all . Out of complete boredoom last night I started researching on cudaminer. With all the praises done on it recently , I said "hell, why not give it a shot, my GTX 660 SLI is doing nothing most of the time anyway". Found the cudaminer thread and even after reading a couple of dozens pages , I am still confused. I see people bragging about 50 to 300khash/s and on my cards with  scrypt-jane I get around 2.75khash/s . Unless I am reading something wrong, that won't even pay the electric bill. Although.... the thread OP on cudaminer posted similar numbers on different other cards, so no idea what to think.

 I am mining on mine-litecoin.com .