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GTX 750 Ti mining - Page 27

post #261 of 1291
Quote:
Originally Posted by AlphaC View Post

So... why are you using CX PSUs
I'm just curious how much you pay for electricity.

I would not use Corsair CX430 , they have about 80-84% efficiency and it's worse at low loads. That's sort of counterproductive if you're going for performance per watt.

http://www.hardwaresecrets.com/article/Corsair-CX430-Power-Supply-Review/1200/7
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story2&reid=214
http://www.techpowerup.com/reviews/Corsair/CX430_V2/5.html

It's going to be more expensive to daisy-chain two CX430s than to buy a decent 750-800W Gold or platinum PSU for $70-80 such as Rosewill Capstone , Cooler Master V Series, NZXT Hale90, Seasonic G series, or XFX TS or XTR , Kingwin Lazer Platinum , etc.

you are right and I have plenty of quality psus in the house not being used, I have four V1000's and 2x lepa 1200W my business partner bought this 430 I never asked him to.
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post #262 of 1291
Quote:
Originally Posted by AlphaC View Post


drkrider, the bad card has less power on tap if it's using less voltage

Can you elaborate? I even just reflashed the BIOS with the increased TDP mod, which I have done with another card. I flashed the exact same BIOS as that one, still only 1111mv. Is this card just less worthy?
post #263 of 1291
I've seen some people here use Zotac cards either the regular or the OC edition. Is there a significant difference in mining performance between the two? Their factory specs differ only by a dozen megahertz in the core clocks, and memory appears to be the same. Would there be any better value to get the OC version? Do they have much better overclock/power overhead potential? If its 6-pin connector of the OC version has anything to go by.
Edited by ccRicers - 3/6/14 at 6:20pm
post #264 of 1291
Thread Starter 
Quote:
Originally Posted by drkrider View Post

Can you elaborate? I even just reflashed the BIOS with the increased TDP mod, which I have done with another card. I flashed the exact same BIOS as that one, still only 1111mv. Is this card just less worthy?

You could play around with Kepler Bios Tweaker as far as voltages perhaps.

Is the memory the same as the other ones? Maybe it is using a lower grade memory like Hynix BFR (5Ghz) instead of AFR (6Ghz) and the Samsung K4G41325FC-HC03 rated for 6Ghz.

What the ASIC level on the bad one and the other ones? hisapon74 theorized that lower ASIC achieves lower hashrate.

If it's that bad and you just bought them for mining and not using, flash it back to stock BIOS and sell it on craigslist or OCN marketplace (better than ebay, with a 10% cut to fees) to someone that just wants to game.

----
Six Gigabyte GTX 750 Tis
Quote:
The result we’ve got from the 6-card mining rig for mining Scrypt with CUDAminer was a total of 1480 KHS as hashrate. Then after overclocking the video cards to the maximum stable result we managed to get (+135 MHz for the GPU and +610 MHz for the video memory) we’ve managed to increase the total hashrate to about 1615 KHS. We went as far as to increase the power target limit from the default 38.5W by modifying the video BIOS of the cards. With the modified video BIOS we have managed to get slightly more than 1700 KHS with a lot of extra power used by the whole system that made it not worth it the so little extra increase in the hashrate. Just to be sure that the x1-x1 PCI-E risers (not powered) might be the cause of slight performance drop we’ve replaced them with x1-x16 USB 3.0 powered extenders, though that did not change the performance we got from the cards.

The Gigabyte GeForce GTX 750 Ti video cards we used for the mining rig do have an external PCI-E power connector, however it seems that unlike AMD graphics with OpenCL, when using Nvidia-based GPUs with CUDA for mining the use of a x1 PCI-E lane to access the video card does introduce slight performance drop and if you multiply the 10-15 KHS less per card for a 6-card mining rig it is not so little. So it is important to know that if you are going to build a GTX 750 Ti-based mining rig you will be getting slightly lower hashrate if you are using PCI-E extenders as compared to what you will get with cards inserted in x16 PCI-E slot directly. Also there is some variation between cards in terms of the maximum overclock supported that results in different maximum frequencies that you can achieve, for example if one card is able to do +135/+700 MHz for the GPU/VRAM the second one could be maximum +100/+600. This means that in a 6-card mining rig you will need to either sync all of the cards and use the same lower settings for overclocking the GPUs to ensure they will run stable or to not have the settings synced and find the maximum for each of the cards.

Another interesting thing we have noticed is that while the use of T5x24 kernel for a single card with CUDAminer for best results, for a 6-card mining rig the use of T10x24 might sometimes provide slightly higher hashrate than T5x24, so you should try with both and see what works better in your individual case. Tomorrow we are going to be doing some more testing of the 6-card GTX 750 Ti mining rig that will be focused mostly on the power consumption as this is also a very important thing when talking about crypto currency mining.
http://cryptomining-blog.com/1276-first-impressions-from-a-6-card-mining-rig-using-geforce-gtx-750-ti-gpus/
Edited by AlphaC - 3/6/14 at 6:21pm
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post #265 of 1291
Quote:
Originally Posted by AlphaC View Post


What the ASIC level on the bad one and the other ones? hisapon74 theorized that lower ASIC achieves lower hashrate.

----

How do I check this?

Also, I was able to get the mem up to 550 on the bad card! I had to lower the GPU core -5, weird. Anyway, Happily hashing away at 305 on each card without breaking a sweat, now for the fine tuning thumb.gif
post #266 of 1291
Quote:
Originally Posted by AlphaC View Post


I don't think EVGA is going to be any good for mining since it looks like secondary phase uses an Iron choke and d-pak mosfet like reference design. It will likely explode after a week. tongue.gif

Other thoughts:
Due to lack of Displayport, ASUS/MSI/Gigabyte/ZOTAC/PNY cards are not adequately hedged via GPU. G-sync requires displayport 1.2.

EVGA seems like it would be a good bet until you see the PCB without the cooler, with the d-pak and iron choke for secondary phases. I'd buy it in a heatbeat except for that fact (it's a big problem when you're using memory intensive algorithms with a single phase memory that is powered by d-paks).

The GTX 750 Ti SC is the ideal card if it weren't for that (base to SC difference is the copper core insert on the heatsink). The GTX 750 Ti FTW befuddles me as the market value is $170+ and it is close to 10 inches like the MSI but only packing 3 phases for the core and d-pak + iron choke for the memory phase.
Quote:
Originally Posted by drkrider View Post

How do I check this?

Also, I was able to get the mem up to 550 on the bad card! I had to lower the GPU core -5, weird. Anyway, Happily hashing away at 305 on each card without breaking a sweat, now for the fine tuning thumb.gif

Just have latest gpu-z and right click the bar
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post #267 of 1291
so everyone that had riser issues found out it was windows 8 to blame it seems? I heard some tell about amd boards being the culprit but I kind of discount that, lets hope anyway I have 4 gigabyte 990 ud3 boards ready to go for the 24 gigabyte 750ti i'm getting tomorrow.

Gonna install windows 7 x64 to an ssd and clone it for all the rigs.
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post #268 of 1291
Got 4 of the 6 asus cards running tonight on USB 3.0 risers plugged into all the non 1x board slots. I could get the 1 x slots to work individually or in pairs but had to jumper the to get full hash output from them on the gigabyte board. Trying to run any combination of 4 or more cards though that included any of the 1 x slots jumper end or not and win 7 64 bit would show error in device manager and not load the card. After swapping around and trying different cards in different slots I ruled out bad card or bad riser. I am speculative of the power though. Need to put a voltmeter on the 6 pin moles at the top. It's only a 500 watt power supply and I'm speculating that could be my problem. I cut the ends of of the unneeded power connectors and wired in more 6 pi molex to power the cards off of.
post #269 of 1291
Quote:
Originally Posted by SwarmJAG View Post

Got 4 of the 6 asus cards running tonight on USB 3.0 risers plugged into all the non 1x board slots. I could get the 1 x slots to work individually or in pairs but had to jumper the to get full hash output from them on the gigabyte board. Trying to run any combination of 4 or more cards though that included any of the 1 x slots jumper end or not and win 7 64 bit would show error in device manager and not load the card. After swapping around and trying different cards in different slots I ruled out bad card or bad riser. I am speculative of the power though. Need to put a voltmeter on the 6 pin moles at the top. It's only a 500 watt power supply and I'm speculating that could be my problem. I cut the ends of of the unneeded power connectors and wired in more 6 pi molex to power the cards off of.

what gigabyte board was it ?
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post #270 of 1291
Quote:
Originally Posted by drkrider View Post

Hey,

Was wondering if anyone is running into any undervolting issues?

I have 4x EVGA FTW models, 3 of the 4 overclock like champs. But one is quite bad. Craps out if I get any more than +200 on mem when the others are hitting 600+...

I thought the card may be a dud, then I noticed on Precision X the voltage is only 1111mv for the crappy card...whereas the others are at 1149, 1167, 1136 with the same minor overclock (+200 mem). I know the PSU is good, I checked it with a PSU tester, all voltages read fine.

The Precision X overvoltage adjustment doesn't do anything (on any of the cards).

Anyone have any idea what the problem could be? Thanks.


My EVGA cards are also all over the place with (reported) voltage, and I can't get the overvoltage to work either. Maybe we should tweak the BIOSs.
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