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GTX 750 Ti mining - Page 89

post #881 of 1291
Quote:
Originally Posted by xartic1 View Post

I haven't messed with more than 2 nvidia cards on a single system yet, but have you tried using the parameter "-d 0,1,2,3"?
I start an instance for every card, so this isn't a problem wink.gif
My problem is, that they don't even show up in Windows :/ Also, my mainboard doens't have any options for PCI-E... its just pretty old (X58) with PCI-E 2.0 (6x 16x, with a PLX Chip, as far as I know)
post #882 of 1291
Quote:
Originally Posted by ANJULE View Post

Depends. Mainly the motherboard will affect. Does your motherboard have additional 4pin molex-connectors that power the pci-e lanes?
If you don’t have, then it is better to use powered models.
Some report that usb-risers might have some downgrading influence to hashrate, compared to traditional pci-e risers that have ribbon-cables.
But in short risers will do the trick.
If you want to save money, sell that case and the cooling of your computer will improve also. After that it is also easier to add more GPU's to your MB.
Quote:
Originally Posted by Amsterdamned View Post

Hey Guys,

Noobie miner here in Aussieland. Got a crappy old MSI PH67A-C43 that I just bought a Gainward GTX 750 Ti (non Golden Sample) for. So far its been great. Easy 305kh/s overclock with 92 Core Clock and 475 Mem Clock and running super cool. The card doesn't have any external power connectors so its all off the PCI slot.

I'd like to add a couple more of the same cards for a ghetto but low power mining rig by routing some PCI risers out of the case. Presumably I'll need to run powered risers? Or with the cards low power requirements can I run unpowered risers?

Will something like this do the trick?



Cheers to all.

So got hold of a Gigabyte GTX 750 ti since the Gainwards were all sold out. I've put the Gigabyte in the internal 16x slot and the Gainward on an external USB 1x to 16x riser. Using either Afterburner or EVGA Precision I can keep the Gainward clocked at 300mhz but the internal Gigabyte I can't get beyond 215kh/s no matter what I try. If I disconnect the Gainward on the external riser I can clock the Gigabyte to 300kh/s so its not the card. These are my cuda settings:


cudaminer.exe -d 0,1 -i 0 -l T5x24 -C 2 -m 1 -H 0

Would it have something to do with the mobo or is it likely the USB riser? I've got one other 1x slot on my mobo which I haven't tried yet for the riser. Any other ideas?
post #883 of 1291
Quote:
Originally Posted by xartic1 View Post

I haven't messed with more than 2 nvidia cards on a single system yet, but have you tried using the parameter "-d 0,1,2,3"?

Quote:
Originally Posted by Amsterdamned View Post


So got hold of a Gigabyte GTX 750 ti since the Gainwards were all sold out. I've put the Gigabyte in the internal 16x slot and the Gainward on an external USB 1x to 16x riser. Using either Afterburner or EVGA Precision I can keep the Gainward clocked at 300mhz but the internal Gigabyte I can't get beyond 215kh/s no matter what I try. If I disconnect the Gainward on the external riser I can clock the Gigabyte to 300kh/s so its not the card. These are my cuda settings:


cudaminer.exe -d 0,1 -i 0 -l T5x24 -C 2 -m 1 -H 0

Would it have something to do with the mobo or is it likely the USB riser? I've got one other 1x slot on my mobo which I haven't tried yet for the riser. Any other ideas?

Might have to do with the pci-e lanes layout...but anyway, what the heck are you doing mining scrypt coins with them???

See this chart: (8 gtx 750 ti's)

post #884 of 1291
Quote:
Originally Posted by Amsterdamned View Post


So got hold of a Gigabyte GTX 750 ti since the Gainwards were all sold out. I've put the Gigabyte in the internal 16x slot and the Gainward on an external USB 1x to 16x riser. Using either Afterburner or EVGA Precision I can keep the Gainward clocked at 300mhz but the internal Gigabyte I can't get beyond 215kh/s no matter what I try. If I disconnect the Gainward on the external riser I can clock the Gigabyte to 300kh/s so its not the card. These are my cuda settings:


cudaminer.exe -d 0,1 -i 0 -l T5x24 -C 2 -m 1 -H 0

Would it have something to do with the mobo or is it likely the USB riser? I've got one other 1x slot on my mobo which I haven't tried yet for the riser. Any other ideas?

Try opening a browser with Flash Player active. This has kept a lot of my cards without monitors up and running at their full speeds.
post #885 of 1291
Quote:
Originally Posted by Freekers View Post

This tells us that the 750TI alone uses:
Idle: 5W
Load: 83W
OC Idle: 5W
OC Load: 93W.

I know this thread is related to mining using the 750 Ti but you guys seem to be so knowledgeable about this card that I thought I'd ask a few questions. I am making a low powered build for typical home use and some occasional gaming and the 750 TI seems right for me. I have an MSI N750TI-2GD5/OC and I'm seeing about 9 watts of power draw at idle and around 75 watts at load as measured by my killawatt meter. I stumbled on Freekers post (quote above) where he saw 5 watts idle with his gigabyte card and I was wonder how you achieved this? Was this possible because of the custom BIOS you flashed to the card? I'm really only interested in this because I'm trying to investigate how to tweak the BIOS so to get the power consumption as low as possible while still having a functional system.
Edited by necbot - 3/31/14 at 7:56pm
post #886 of 1291
Quote:
Originally Posted by necbot View Post

I know this thread is related to mining using the 750 Ti but you guys seem to be so knowledgeable about this card that I thought I'd ask a few questions. I am making a low powered build for typical home use and some occasional gaming and the 750 TI seems right for me. I have an MSI N750TI-2GD5/OC and I'm seeing about 9 watts of power draw at idle and around 75 watts at load as measured by my killawatt meter. I stumbled on Freekers post (quote above) where he saw 5 watts idle with his gigabyte card and I was wonder how you achieved this? Was this possible because of the custom BIOS you flashed to the card? I'm really only interested in this because I'm trying to investigate how to tweak the BIOS so to get the power consumption as low as possible while still having a functional system.

Every time I have used a custom bios, it has removed the idle pstate for the cards to drop to idle clocks and voltage. You can get better voltage/ clock speed ratio with a custom bios, which can allow you to achieve better efficiency under load, but any other time you will sending quite a bit more power to the card on idle.

The lower speed the fan is and only having 1 as opposed to 2, would automatically qualify it to draw less power.

Edit: And honestly, if you were to get a 750 Ti then you should look into the power target % and overclocking the core and memory speeds. This has dropped my power consumption on all of my Nvidia Kepler based cards.
post #887 of 1291
Thanks for the explaination xartic1. So Freekers low idle power is probably related to the custom BIOS he got from cryptomining-blog.com? In the Kepler BIOS Tweaker I don't see any options to disable a pstate.

Also, you mentioned that overclocking the core and memory would improve power consumption, Freekers power consumption values seem to indicate that the OC gave him a higher power consumption.
post #888 of 1291
Quote:
Originally Posted by necbot View Post

Thanks for the explaination xartic1. So Freekers low idle power is probably related to the custom BIOS he got from cryptomining-blog.com? In the Kepler BIOS Tweaker I don't see any options to disable a pstate.

Also, you mentioned that overclocking the core and memory would improve power consumption, Freekers power consumption values seem to indicate that the OC gave him a higher power consumption.

I can't speak entirely on behalf of the vbios since the one I used is different.

Let me explain how my 750m on my dell works. If I don't add 135+mhz to the core, my voltage is at 1.12 and my "prioritize temperature" in Nvidia Inspector is set to 65C with my core speeds at 1058. When I increase my core by 135 mhz, the temps start rising so the GPU undervolts the card a bit and then downclocks it from the new max I just set (1193mhz) until it can stabalize itself at 65C. Setting higher clock speeds allows the card to run at the same voltage but will generate a tad bit more heat. After my temps stabilize to 65C, it usually ends up being around 1084mhz at 1.042V. If you notice the values, the core speed is higher than the original, and the voltage is lower. Across all of my Nvidia cards, it has either allow me to reduce the heat generated (useful for cards stacked on each other) and also reduce the amount of power sent to the card.
post #889 of 1291
http://www.cudaminers.net/forum

New forum to support and organize NVIDIA miners and related info.
cudaminer/ccminer dev supports it.

I'm giving it a try.

wink.gif
post #890 of 1291
Quote:
Originally Posted by RavenXBR View Post

http://www.cudaminers.net/forum

New forum to support and organize NVIDIA miners and related info.
cudaminer/ccminer dev supports it.

I'm giving it a try.

wink.gif

I'll be following this site also. smile.gif

Btw, whats your success rate "yay!!!" with ccminer 0.5 (x86) on heavycoin. I'm a little bit under 95%. No crash since I switched to the x86 version but my success rate is lower.
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