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post #471 of 1291
Quote:
Originally Posted by Americonfusion View Post

That is an incorrect figure, the most Ive seen these cards pull is 90 watts each and thats with bios flashing and high overclocking. My 5 card rig pulls 470 watts to the wall with the cards averaging about 315khs each.

Thanks you sir:thumb: +1 rep
 
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post #472 of 1291
Quote:
Originally Posted by Americonfusion View Post

That is an incorrect figure, the most Ive seen these cards pull is 90 watts each and thats with bios flashing and high overclocking. My 5 card rig pulls 470 watts to the wall with the cards averaging about 315khs each.

I am running 5 stock ASUS GTX 750 TI's on a headless rig (xubuntu 13.10 on 16 gb USB flash) I get 250 khs mining script give or take 10 per card and I'm pulling 420 watts at the wall. A big factor is the efficiency rating of your power supply as in how many watts at the wall does it take to make a watt the card pulls. In other words its taking 70 watts at the wall to supply the card with 45 to 50 watts which is what the un modded bios is stuck at. By adding 1 card at a time I confirmed it was exactly 70watts per card at full load at the wall at least on my el junko 500 watt 40 dollar powesupply. I am replacing that with a high end 1000 watt this weekend and will unlock the bios on all cards and add a 6th card and let you know the new stats. The short answer though is bone stock no overclock your looking at 250khs at ~70 watts at the wall
post #473 of 1291
Quote:
Originally Posted by computerparts View Post

I have these exact cards as well. Tried T10x24 which they didn't like at all. Then tried T5x24 and the best they could do was 150 kh/s. I'll try T8x24.
Can I suggest you try running without any tags? I've got a non-ti and it pulls 255 with no tags. Add any and it drops to <170 smile.gif
post #474 of 1291
Quote:
Originally Posted by LiveSideways View Post

Can I suggest you try running without any tags? I've got a non-ti and it pulls 255 with no tags. Add any and it drops to <170 smile.gif

No tags got me where I am right now - I use CUDA Manager and ran it through the autotune, and CUDA Manager told me it was using T8x24. So I just saved the config in a batch file and have been playing with.
post #475 of 1291
Quote:
Originally Posted by SwarmJAG View Post

I have an important update to the mining community for those of you having problems with the gigabyte 990FXA UD3 motherboard. I was having some serious issues getting this board to work rit with the gtx 750tis mining. I ended up doin a number of controlled tests. What I discovered is that the real issue is the motherboard does not like powered usb risers. Through careful controlled testing in multiple configurations I proved that the 16x slots will run with no issues on these risers but the 1x and 4x pcie slots will crash every time. What will happen is at least one will crash then over time the others will as well leaving only the cards in 16x slots on USB risers working.

So. 4x slots and 16x slots direct on the board worked flawlessly, but of course not ideal for heat dissipation especially with 3 2x wide cards direct on the board.

Now the good news standard ribbon based risers seem to work fine. I ran 4 cards all day yesterday on 1x to 16x powered risers and today I'm running 5. No issues so far. Rock steady. Will add the 6th card tonight or tomorrow.

Hope this helps someone.

i am running 5 evga sc 750 ti cards on the gigabyte 990fxa ud3 with powered ribbon risers. the rig runs stable at stock oc and no bios mod, but any attempt to oc causes cudaminer to go haywire, and when i modded the bios on the cards the fans all ran at 100% had to re flash stock bios.

disappointing as i was able to oc two of the same cards on a different motherboard.
post #476 of 1291
My 2 Galaxy 750 Ti GC arrived today. Both of them together are pulling 560 khash with a 200+ core and 200+ mem oc (any more on either one didn't help). I have them both running inside my old Maingear Vybe case and they don't have a pci slot space in between them. The top card tops out at 55C, while the bottom is at 48C. The best part, they pull 120W from the wall total.

Parameters at T5x24 and that's basically it.
post #477 of 1291
Mine Gigabyte GTX 750 Ti (N75TOC-2GI) arrived yesterday.
It's installed inside a regular closed case desktop directly at the PCI-E x16 slot.

I spent the whole night testing it with Cudaminer and EVGA Precision X.


1) Chrome Trick

First, I tested the "Chrome trick" with several other software.
No OC e no parameters on Cudaminer.
Below the results:



As seen, the best average rates that you will achieve is 243KHs for cudaminer 32 bits version and 258KHs for the 64 bits version.

As Chrome proved to be the best option (Google Earth is a "heavy" program to be running in the background), I decided to use only it for further tests.

The following tests were performed with Chrome running (doesn't need to be maximized).


2) Cudaminer Tunning

The minimum set of parameters for Cudaminer give some real improvement is this: -l T5x24 -i 0 -C 1
With it I got 264KHs in both 32 and 64 bits version.

So, I tried almost all possible combinations of the most usual parameters. Here's my conclusion:
- Changing T5x24 to T10x24 makes no difference.
- Changing C1 to C2 gives you around 1KHs more.
- Adding -m1 gives you around 1KHs more.

Thus, the following set is recommended for a average rate of 266KHs: -l T5x24 -i 0 -C 2 -m 1

You can gain another 10KHs adding the -H1 parameter. I achieved around 275KHs with it (-l T5x24 -i 0 -C 2 -m 1 -H 1).
However, it will make use of your CPU together with the GPU, which will cause greater temperature and, specially, noise.
Using -H1 my CPU remained constantly above 60ºC and the fan was very loud.
I don't have a Kill-A-Watt to evaluate precisely, but, I can imagine that the KHs gained will not pay the extra KW.
Using -H2 makes no sense because its the default value and brings no gain.


3) Overclock

I wasn't so thorough in this part as previous ones (I'm without sleep and tired), but, I managed to perform some tests.
Assuming the recommended Cudaminer parameter configuration (-l T5x24 -i 0 -C 2 -m 1), I could achieve around 300KHs with the following EVGA Precision X profile:
- GPU +135
- MEM +700
- Power Target 100%

GPU temperature remained at 58ºC and fan speed at 70%. Very stable and quiet OC.
I think much more than that cannot be "power effective".

Some more aggressive values crashed the GPU.

Will research more OC options next days.


;-)
post #478 of 1291
Instead of running chrome in the background, have you tried "prefer maximum performance" in the NVidia control panel?
     
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post #479 of 1291
Quote:
Originally Posted by ivanlabrie View Post

You do need to tune settings with cudaminer to get optimal results...for instance, those graphs show 780s pulling 450kh/s, well mine does 716kh/s at 1267mhz core. It's all in the settings thumb.gif

So, what are your settings? My 780 after a lot of trys and error it only gets 600kh/s.

Thanks.
post #480 of 1291
Quote:
Originally Posted by RavenXBR View Post

Mine Gigabyte GTX 750 Ti (N75TOC-2GI) arrived yesterday.
It's installed inside a regular closed case desktop directly at the PCI-E x16 slot.

I spent the whole night testing it with Cudaminer and EVGA Precision X.


1) Chrome Trick

First, I tested the "Chrome trick" with several other software.
No OC e no parameters on Cudaminer.
Below the results:



As seen, the best average rates that you will achieve is 243KHs for cudaminer 32 bits version and 258KHs for the 64 bits version.

As Chrome proved to be the best option (Google Earth is a "heavy" program to be running in the background), I decided to use only it for further tests.

The following tests were performed with Chrome running (doesn't need to be maximized).


2) Cudaminer Tunning

The minimum set of parameters for Cudaminer give some real improvement is this: -l T5x24 -i 0 -C 1
With it I got 264KHs in both 32 and 64 bits version.

So, I tried almost all possible combinations of the most usual parameters. Here's my conclusion:
- Changing T5x24 to T10x24 makes no difference.
- Changing C1 to C2 gives you around 1KHs more.
- Adding -m1 gives you around 1KHs more.

Thus, the following set is recommended for a average rate of 266KHs: -l T5x24 -i 0 -C 2 -m 1

You can gain another 10KHs adding the -H1 parameter. I achieved around 275KHs with it (-l T5x24 -i 0 -C 2 -m 1 -H 1).
However, it will make use of your CPU together with the GPU, which will cause greater temperature and, specially, noise.
Using -H1 my CPU remained constantly above 60ºC and the fan was very loud.
I don't have a Kill-A-Watt to evaluate precisely, but, I can imagine that the KHs gained will not pay the extra KW.
Using -H2 makes no sense because its the default value and brings no gain.


3) Overclock

I wasn't so thorough in this part as previous ones (I'm without sleep and tired), but, I managed to perform some tests.
Assuming the recommended Cudaminer parameter configuration (-l T5x24 -i 0 -C 2 -m 1), I could achieve around 300KHs with the following EVGA Precision X profile:
- GPU +135
- MEM +700
- Power Target 100%

GPU temperature remained at 58ºC and fan speed at 70%. Very stable and quiet OC.
I think much more than that cannot be "power effective".

Some more aggressive values crashed the GPU.

Will research more OC options next days.


;-)

Thanks, pretty cool that you tested that.

Try -H 0 and see how it goes, it assigns 1 core/thread instead of the whole cpu, similar to what radeons do while mining (you need one free thread for cgminer to work).
Quote:
Originally Posted by NvNw View Post

So, what are your settings? My 780 after a lot of trys and error it only gets 600kh/s.

Thanks.

There ya go: cudaminer.exe -d GTX780 -m 1 -l Z12x24 -i 0 -H 2 -C 0 -o stratum+tcp://useast.middlecoin.com:3333 -O 13jFjtuKoCfSd3bkLJQJg7EoBXWmebvA8x:x

Experiment with -H 1 and 0 as well, and -m 0 was slightly more stable it seems.

Mod the bios, using skynet's ones otherwise you won't go over 550.
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