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GTX 750 Ti mining - Page 45

post #441 of 1291
Quote:
Originally Posted by Aurosonic View Post

Here is my farming rig smile.gif 12x750Ti, 3650khs, 1100W power consumption :


Nice! Did you have any issues overclocking the non-PCIe 6-pin MSI cards? Mine are crashing if I push them even a little (just got some in the mail yesterday). I'm finding that my cards that have six-pin PCIe cables are more stable. I think this may have to do with a limitation of the power delivery from the molex header on the USB 3.0 riser cards.But, it seems like you have a mix of both types of risers and mostly non-six pin cards and have no problem hitting 300+ kH/s. I wonder if my ASUS Z87-Pro is to blame at all?

If I plug the MSI card directly to x16 slot, I have no problems pushing it to 320+ kH/s.

Edit...now I'm starting to confirm my thoughts that it's a power delivery issue...that can simply be mitigated by not applying any OC changes while the GPU's are mining. If I adjust clocks when cards are idle, then restart mining, seems like this may be more promising. I'll have to play with this later tonight after work. Maybe I won't have to RMA after all.....
Edited by gfgrimm - 3/11/14 at 11:38am
post #442 of 1291
Damn, my 750 ti mining adventures are put on hold until I can get a HDMI to DVI adapter. I booted my Xubuntu hard drive into the Z87X board but I don't have a video signal from any of the video cards, not even for BIOS or POST. Probably should have uninstalled those Catalyst drivers too...
post #443 of 1291
Quote:
Originally Posted by Freekers View Post

Thanks for your reply smile.gif

Could you try out the following for me please?

1. Try these cudaminer parameters: -l T5x24 -C 1 -i 0 -H 2
2. Measure power usage with a Kill-A-Watt?
3. Try overclocking it?

I'm thinking about building a 6x 750 setup. If my calculations are correct, you should be able to get around 1650 KH/s if overclocked at about 490 watts. That's almost the same khs / watt ratio as with the 750ti only at a lower price.

Thanks in advance!

1.Those settings knocked production down to 167Kh/s. Went back to tagless and popped right back up to 255Kh/s.
2. No Kill-A-Watt for home, sorry.
3. Does not seem to overclock very well, at least my sample. Anything over +100 core or +340 ram causes cudaminer to freak out and the PC to restart. Was only able to gain 12Kh/s before becoming unstable. At that small of a gain I opted to stay at the stock clocks. May be important to note the 'stock' clocks on this card are 1320mhz for core and 1253mhz for ram (5012mhz effective). Seems the core has a much higher starting point than some of the Ti's.
post #444 of 1291
Thread cleaned. Let's stay on topic of the 750 Ti and not motherboards. Thanks thumb.gif
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Project Arch
(16 items)
 
BigByte
(8 items)
 
Macbook Pro
(8 items)
 
CPUMotherboardGraphicsRAM
Intel i7 5960x @ 4.8ghz Asus X99-E WS 2 x Nvidia Quadro K6000 Corsair Dominator Platinum 64gb 2666 
Hard DriveCoolingOSMonitor
2 x Samsung 850 Pro 512gb {RAID 0} Swiftech H320 w/ Noctua NF-F12 iPPC Arch Linux w/ OpenBox 2 x LG 31MU97 Cinema 4K 
KeyboardPowerCaseMouse
Vortex KBC Poker II PBT EVGA SuperNOVA 1000 G2 Corsair Obsidian 450D Zowie FK1 
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post #445 of 1291
I am still hashing away with my GTX 750 non Ti.

Similar to Aurosonic's 750 Ti performance, I get 255kh/sec with 80 or 90 watts at the wall.

Unlike the what the other posters say, I am able to mod the BIOS to adjust voltage and extend the overclocking limit from 135 to whatever.

Unfortunately, neither of those changes results in more hashes or lower power.

I am thinking that the actual voltage/clock is some function of the other BIOS parameters, so I am thinking of INCREASING some of the clocks and then using EVGA Precision to tone it down.
post #446 of 1291
Depending on the max hash for the 750 non-Ti, they could be the king of hash/$ and hash/w, at least based on current prices and availability. I will see what I can do with the MSI I'm getting today. If we can get 265-270 on these we are anywhere from 2.2-2.45kh/$ (average price on the lower-end non-Tis is $120 - free shipping many places, and some deals with rebates for ~$110). The R9 270, if you can find one, is running at least $229. You may get lucky and find them cheaper. Assuming an average of 480kh/s on the R9, you're looking at 2.1~kh/$. Of course the 750 would require more cards so if you were going for a lot of rigs you'd have to factor in the additional density.
post #447 of 1291
Quote:
Originally Posted by gfgrimm View Post

Nice! Did you have any issues overclocking the non-PCIe 6-pin MSI cards? Mine are crashing if I push them even a little (just got some in the mail yesterday). I'm finding that my cards that have six-pin PCIe cables are more stable. I think this may have to do with a limitation of the power delivery from the molex header on the USB 3.0 riser cards.But, it seems like you have a mix of both types of risers and mostly non-six pin cards and have no problem hitting 300+ kH/s. I wonder if my ASUS Z87-Pro is to blame at all?

If I plug the MSI card directly to x16 slot, I have no problems pushing it to 320+ kH/s.

Edit...now I'm starting to confirm my thoughts that it's a power delivery issue...that can simply be mitigated by not applying any OC changes while the GPU's are mining. If I adjust clocks when cards are idle, then restart mining, seems like this may be more promising. I'll have to play with this later tonight after work. Maybe I won't have to RMA after all.....

I picked up 2 of the MSI non-pcie cards to test out along with 3 PNY OC in addition to the 5 EVGA FTWs I already had. The MSI cards are crap, easily the worst cards out of the bunch, they don't overclock for crap and crash way more than even the worst PNY OC cards and EVGA FTWs. The EVGA cards are pretty good at 305-315khs stable good but the PNY OC cards are by far my favorite at 320-325 stable and needing no PCIe. I'll probably run the MSI cards till I can get some more PNYs then those MSI cards will be going on ebay, probably wont be buying MSI again.
post #448 of 1291
Quote:
Originally Posted by Datlore001 View Post

Depending on the max hash for the 750 non-Ti, they could be the king of hash/$ and hash/w, at least based on current prices and availability. I will see what I can do with the MSI I'm getting today. If we can get 265-270 on these we are anywhere from 2.2-2.45kh/$ (average price on the lower-end non-Tis is $120 - free shipping many places, and some deals with rebates for ~$110). The R9 270, if you can find one, is running at least $229. You may get lucky and find them cheaper. Assuming an average of 480kh/s on the R9, you're looking at 2.1~kh/$. Of course the 750 would require more cards so if you were going for a lot of rigs you'd have to factor in the additional density.

If you are just tossing a card or 2 into an existing computer then yea they would be good but if you are building whole mining rigs they will not be that good once you take into consideration the base cost of all the system components.
post #449 of 1291
I just bought some PNY OC cards because I heard good things about them and their out-of-the-box performance. Someone is reporting 306kh/s just with the factory settings. It better be good for an 18% overclock above stock.

One thing I also noticed about the Z87X-OC is that it has an auxiliary 6-pin port just beside the top PCIe port. It's supposed to provide more power stability for multiple cards but I don't know if this makes a difference with low power cards such as the 750's. Maybe Ivan can give me an idea on this.
post #450 of 1291
Quote:
Originally Posted by ccRicers View Post

I just bought some PNY OC cards because I heard good things about them and their out-of-the-box performance. Someone is reporting 306kh/s just with the factory settings. It better be good for an 18% overclock above stock.

One thing I also noticed about the Z87X-OC is that it has an auxiliary 6-pin port just beside the top PCIe port. It's supposed to provide more power stability for multiple cards but I don't know if this makes a difference with low power cards such as the 750's. Maybe Ivan can give me an idea on this.

That's for n R9 290 or GTX 780Ti with liquid nitrogen tongue.gif Or quad GTX 780s or something. Doesn't hurt to use it, eliminates the need for powered risers.
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