cudaminer.exe --algo=scrypt:2048 -d 1 -i 0 -l t12x20 -o 127.0.0.1:8108 -O 1:x


gives me 166 kh/s, what clock is your 780 running at?

Hmm 173khash/so is all I can get out of my 780

I tried your launch config on my 780's, but I'm only getting 40Kh/s on scrypt.

Ah, no worries. Would still be curious if 3.0 slots yield any benefit versus 2.0 slots for cudaminer if there was any way you had a means of doing that without messing up the water cooling.

Hey guys,
  Am new here, and new to mining with Nvidia cards.  I've been following this thread for the past week, finally got my hands on a few of the 750Ti cards last night.  Picked up 3 different brands, but have only had a chance to tinker with the MSI twin frozr (no pcie plug) so far.  I am definitely no expert, and am learning cudaminer as I go, but wanted to share my experience so far:

  I've only run one card at a time so far.  Biostar H81S2 mobo, 4gb ram 750w psu.   and mostly using auto-tune, as I dont understand the blocks and warps yet..
System idle = 42.2W (per killawatt meter)
gpu = +0, mem= +0, load @99% = 114W.  hashrate 268 kh/s T5x19
gpu = +0, mem +300, hashrate 252kh/s (T230x1.  this may have been a bad setting by auto-tune, i'm not sure.  i initally was trying gpu and mem clocks others were reporting, and was getting alot of instant artifacting, or 'rapid scrolling' error. so i left it at that, and moved on to doing the TDP raising bios mod.

  With TDP bios mod:

gpu = +0, mem= +0, hashrate 272khs, T10x24, gpu utilization 75% (?), and system load increased to 124W (from 114W)
gpu = +0, mem= +300, hashrate 291khs, T10x24, system load = 130Watts.

  This last setting was stable for 6+ hrs while I was at work today.  I have tried, briefly, with higher gpu and mem clocks, and highest i've hit was ~322khs. but i need to keep testing for stability, as i was getting errors along the way.  Interestingly, the bios mod has definitely increased power draw, and has allowed near 300khs with a modest +300 mem overclock.  I have seen others on this thread with much higher clocks at this speed.  Christian, are you using a modified bios on your 750 Ti?  I feel there is more there.  Also, after the bios mod, the power % on Precision X drops to 75%.  I dont understand this, or if it may be reporting it incorrectly.
   I'll continue seeing how far i can push this card.  I am concerned about the scalability issues others are having, and will assess this as well, when i have time to add other cards (hopefully tonight).  Will keep you guys posted on my findings.