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GTX 750 Ti mining - Page 26

post #251 of 1291
cx430 x 2 per rig? (6 gpu rigs?)

I was considering the Seasonic G series 750w psus, they are cheep.
post #252 of 1291
Quote:
Originally Posted by sec0nd2n0ne View Post

Hi, what mobo are you using? what type of risers do you use?

ASRock H81 Pro BTC with non-powered ribbon risers
post #253 of 1291
I picked up a gigabyte 990FXA-UD3 and 6 ASUS GTX 750 ti cards. Started with the KISS principle at first 1 card no riser. After miserable failing for 8 hours trying to do a headless install od Ubuntu or xubuntu via usb to usb and then another few hours trying to do the same but cd to hard drive I finally gave up and installed win 7 64 bit on a spare drive. Ohh well at least you can run msi afterburner this way. I haven't flashed bios to unlock power but.... Using the stock asus cards I have had pretty poor results overclocking. At + 150 mem cudaminer would crash. Will try unlocking via bios flas tonight too see if that helps. Stock these cards get 250 to 265khs with chrome open. Need more hash stable.. Ugg

On a side note it sure would be nice if cudaminer could have an option to log something on failure and show which card failed when you have multiples going, and even something that would allow cudaminer to restart automatically on failure.
post #254 of 1291
So does the 750 Ti work on risers?

The R9 280X prices are a bit down.
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post #255 of 1291
I have five EVGA 02G-P4-3757-KR 750 Ti FTWs running on an old GA-MA790X-UD4P motherboard with non powered 1x risers. I had ordered the cards and risers before I noticed some of the negative comments in this thread about my choice of hardware. More specifically, I have four on risers and the last card is directly plugged in.

I do see that one of my cards on average goes 325kh on Scrypt while the rest of them cruise at about 305-310 and I have not determined if that is indeed the faster card or not. When I first start I get about 1550 total kh, however when I check back about 15-20 minutes later it only shows about 1475 kh. I run all of the cards at +30 MHz GPU and +600-630 mem. I can't reliably run all five cards at +42 and +650 on scrypt.

While running UTC (Scrypt-Jane) the cards appear to run equally as fast. The speed settings I am using for UTC are 1375 MHz GPU and 1650MHz mem. The EVGAPrecision tool shows +42 MHz GPU and +600 MHz mem. My total speed is about 335kh at the current N factor.

As for the complaints about the fans, I really don't know. My GTX 750 ti cards are hanging on a wire rack in my garage next to six R9 290x reference cards. Even if I shut down all of my Radeons, these things seem whisper quiet to me.

My total power draw measured with a kill-a-watt is about 575 watts on scrypt and IIC about 515 on Scrypt-Jane with the five cards, the older gen 65nm AMD 6000+cpu and older motherboard, all connected to a Corsair CX600 (bronze) PSU. This setup was just thrown together with old spare parts I had lying around, so my example isn't the best model of efficiency. But when I compare to the 290Xs I am really loving it.
Edited by SR20DEN - 3/6/14 at 10:56am
post #256 of 1291
Quote:
Originally Posted by HardwareDecoder View Post

yep im ready to build some more rigs.






You aren't going to try to run 5-6 cards a rig on the 430w PSUs are you? My 5 card rig pulls 470w at the wall at stock tdp and voltage.
post #257 of 1291
Quote:
Originally Posted by Americonfusion View Post

You aren't going to try to run 5-6 cards a rig on the 430w PSUs are you? My 5 card rig pulls 470w at the wall at stock tdp and voltage.
no I'm gonna Daisy chain. don't worry about me I've got v1000s and lepa 1200w also :-)
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post #258 of 1291
I ordered a GV-N75TOC-2GI for testing a couple of days ago. Picked it up today, and I'm very satisfied with the results. At 1228MHz core and 6.6GHz mem, I get ~305khash/s with the stock BIOS. Entire rig draws 73W at the wall while mining, which I find to be very impressive! Should be noted however that all my case fans are low RPM GTs, and I don't have any internal HDDs. Also, system power is coming from an X-560 operating at 230V efficiency levels. wink.gif

I haven't gotten around to tweaking the CudaMiner (x86) settings yet, just went with "--no-autotune -l T5x24 -H 1 -i 0" to get started.

Man, I've already ordered a couple more of these. Seriously considering replacing my 3x290 and 2x280X altogether. Electricity is not that cheap over here.
Edited by HothBase - 3/6/14 at 1:49pm
 
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post #259 of 1291
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.
post #260 of 1291
Thread Starter 
So... why are you using CX PSUs
Quote:
Originally Posted by HardwareDecoder View Post

no I'm gonna Daisy chain. don't worry about me I've got v1000s and lepa 1200w also :-)

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.


drkrider, the bad card has less power on tap if it's using less voltage
Edited by AlphaC - 3/6/14 at 5:06pm
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