I am breaking some speed records for Yacoin mining today
WOW. 1.96 kHash/s on GT 750M with 4 GB DDR3 VRAM using latest github code. -l K2x8. This is a laptop. And it's only using 2077MB out of 4096, including running an Xorg display on Kubuntu 12.04 64bit. And the device remains usable even while mining without the -i 1 flag!
[2014-01-07 12:20:10] GPU #0: GeForce GT 750M with compute capability 3.0
[2014-01-07 12:20:10] GPU #0: interactive: 0, tex-cache: 0 , single-alloc: 0
[2014-01-07 12:20:10] GPU #0: using launch configuration K2x8
[2014-01-07 12:20:12] GPU #0: GeForce GT 750M, 1.87 khash/s
[2014-01-07 12:20:18] Stratum detected new block
[2014-01-07 12:20:19] GPU #0: GeForce GT 750M, 1.89 khash/s
[2014-01-07 12:20:33] Stratum detected new block
[2014-01-07 12:20:33] GPU #0: GeForce GT 750M, 1.93 khash/s
[2014-01-07 12:20:54] GPU #0: GeForce GT 750M, 1.94 khash/s
[2014-01-07 12:20:54] accepted: 1/1 (100.00%), 1.94 khash/s (yay!!!)
[2014-01-07 12:21:53] GPU #0: GeForce GT 750M, 1.96 khash/s
[2014-01-07 12:21:53] accepted: 2/2 (100.00%), 1.96 khash/s (yay!!!)
[2014-01-07 12:22:43] Stratum detected new block
[2014-01-07 12:22:44] GPU #0: GeForce GT 750M, 1.96 khash/s
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 GeForce GT 750M Off | 0000:01:00.0 N/A | N/A |
| N/A 90C N/A N/A / N/A | 2077MiB / 4095MiB | N/A Default |
I think the equivalent desktop part would be a GT 640 with 4 GB DDR3 memory. On my testing with Windows I haven't seen those 1.9 kHash/s so far. My next mining build might consist of a mainboard running 5 GT 640 cards with 4GB each.
And a GTX 660Ti Direct CU II OC from Asus on Ubuntu 9.04 32 bit (EDIT: previously incorrectly stated 12.04 64bit)
[2014-01-07 13:22:14] GPU #0: GeForce GTX 660 Ti with compute capability 3.0
[2014-01-07 13:22:14] GPU #0: interactive: 0, tex-cache: 0 , single-alloc: 1
[2014-01-07 13:22:14] GPU #0: using launch configuration K7x3
[2014-01-07 13:22:16] GPU #0: GeForce GTX 660 Ti, 2.86 khash/s
[2014-01-07 13:22:29] GPU #0: GeForce GTX 660 Ti, 3.09 khash/s
[2014-01-07 13:22:29] accepted: 1/1 (100.00%), 3.09 khash/s (yay!!!)
[2014-01-07 13:22:49] GPU #0: GeForce GTX 660 Ti, 3.12 khash/s
[2014-01-07 13:22:49] accepted: 2/2 (100.00%), 3.12 khash/s (yay!!!)
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 GeForce GTX 660 Ti Off | 0000:01:00.0 N/A | N/A |
| 62% 70C N/A N/A / N/A | 2875MiB / 3071MiB | N/A Default |
On my 780 Tis I think I use -l T4x4 (EDIT: correction. It was -l T7x3 but -l T23x1 is actually slightly better) to get 3.2-3.3 kHash/s. I will check again when I get home.
High end cards are partially idling when doing scrypt-jane. It might be possible to do simultaneous scrypt-jane and scrypt mining, to use all resources on the cards. However it would require some very smart multithreading logic, and simultaneous execution of kernels on the GPU.
Christian