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GTX 750 Ti mining - Page 16

post #151 of 1291
Quote:
Originally Posted by Americonfusion View Post

Yes you can run one copy but this way if a card crashes the others keep hashing uninterrupted or if I want to tune and tweak on one card I can keep running the other 4 while I do it. It's not any harder to run 5 instances over one, just a little copy and pasting of bats and its easier to see the specific output of each card at quick glance.

Could you please share your GPU-Z tabs for one of these cards while it's running? I cannot get a card to go past 230kH/s when it's connectied via a x1 to x16 powered USB riser in Windows 8.1 x64
post #152 of 1291
Quote:
Originally Posted by HardwareDecoder View Post

I don't have any yet biggrin.gif my first one comes tomorrow. The other 24 I ordered are coming some time this week.

My bad I meant to quote AmericanConfusion. smile.gif
post #153 of 1291
Quote:
Originally Posted by gfgrimm View Post

Could you please share your GPU-Z tabs for one of these cards while it's running? I cannot get a card to go past 230kH/s when it's connectied via a x1 to x16 powered USB riser in Windows 8.1 x64

http://i.imgur.com/0VYCQuM.jpg

I just downloaded gpuz to do this, I now see that the TDP is limiting me and will be flashing the bios tomorrow probably.
post #154 of 1291
Quote:
Originally Posted by Americonfusion View Post

http://i.imgur.com/0VYCQuM.jpg

I just downloaded gpuz to do this, I now see that the TDP is limiting me and will be flashing the bios tomorrow probably.

If you need help flashing the BIOS to lift the TDP limit, let me know.

So this performance is achieved with the cards running connected to a powered USB3 x1 to x16 riser cable? Could you also please share the first GPU-Z tab? I'm interested to know what the state of your PCIe bus.

I for the life of me, can't get anything above 240 KH/s with a x1 riser right now. Going nuts...
Edited by gfgrimm - 3/2/14 at 10:12pm
post #155 of 1291
They are all on 1x-16x powered ribbon risers


post #156 of 1291
Quote:
Originally Posted by Americonfusion View Post

http://i.imgur.com/0VYCQuM.jpg

I just downloaded gpuz to do this, I now see that the TDP is limiting me and will be flashing the bios tomorrow probably.

That screenshot shows power consumption at only 90.4% of TDP.
1397MHz at 1.168V is very nice.

I spent some time moding my bios and went from
1215-1228MHz at 1.062-1.068V
to
1268MHz at 1.062-1.068V
+250 memory
298-299 khash/s

I am focusing on efficiency and stability and not max OC.
Would love to know all your overclocks because it may help me to OC higher.
     
CPUMotherboardGraphicsRAM
Athlon II X4 750k Asus F2A85-V MSI GTX 750 Ti Team 2x2GB 
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Pentium G3258 @ 4.4 GHz ~1.38Vcore ~1.9Vccin Ri... MSI H81M-P33 Asus GTX 750 Ti OC + Thermalright HR-11 backsid... Transcend 2x2GB @ 1400MHz (5-7-5-18) ~1.62V 
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CPUMotherboardGraphicsRAM
Athlon II X4 750k Asus F2A85-V MSI GTX 750 Ti Team 2x2GB 
Hard DriveCoolingOSMonitor
Kingston SSD V300 120GB Zalman CNPS5X performa + Arctic MX-4 Windows 7 64-bit Asus VW222 22" LCD 1680x1050 
PowerCase
FSP 460W Foxconn TSAA-426 
CPUMotherboardGraphicsRAM
Pentium G3258 @ 4.4 GHz ~1.38Vcore ~1.9Vccin Ri... MSI H81M-P33 Asus GTX 750 Ti OC + Thermalright HR-11 backsid... Transcend 2x2GB @ 1400MHz (5-7-5-18) ~1.62V 
Hard DriveCoolingOSMonitor
Intel SSD 330 240GB ZM CNPS5X (not performa) + 120mm fan (push) Windows 7 64bit Acer GD245HQ - 1920x1080 120Hz - Nvidia 3D Vision 
PowerCaseAudio
FSP 500W Enermax Phoenix Neo + 220mm Globefan (side) Creative Titanium HD + Beyer DT 880 - 250 ohm 
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post #157 of 1291
Quote:
Originally Posted by Partol View Post

That screenshot shows power consumption at only 90.4% of TDP.
1397MHz at 1.168V is very nice.

I spent some time moding my bios and went from
1215-1228MHz at 1.062-1.068V
to
1268MHz at 1.062-1.068V
+250 memory
298-299 khash/s

I am focusing on efficiency and stability and not max OC.
Would love to know all your overclocks because it may help me to OC higher.

Didn't notice I got it at 90%, it was bouncing between 97-99 most of the time.

core/memory
1398/1695 ~322khs
1388/1644 ~312khs
1370/1659 ~309khs
1393/1680 ~314khs
1369/1614 ~307 khs

The first one is the one that is plugged into the 2.0x16 slot the rest are in x1 slots so you can really see the difference there.
post #158 of 1291
Quote:
Originally Posted by Americonfusion View Post

They are all on 1x-16x powered ribbon risers



Thank you!

For lack of better ideas, I'm swapping out Windows 8.1 x64 for Windows 7 x64 to see if there is any difference. I know that at least 2-3 people with 5+ GTX 750 Ti's have achieved 300+KH/s per card concurrently on Windows. I haven't been able to figure out the differences between my setup and these other people yet. I know that using Ubuntu 12.04, I do see better performance/scaling when running the cards concurrently.

I just tried two different systems running Windows 8.1 x64 with a GTX 750 Ti plugged into a x1-x16 USB3 riser assembly. Both perform consistently bad.
post #159 of 1291
Quote:
Originally Posted by HardwareDecoder View Post

yeah it seems like cudaminer is way behind cgminer in terms of usability.

Yeah no backup pools make it not worth doing a farm with. Can't use betarigs, api, or backup pools.

I have it at 310 on each card. I can do 325 to 340. But with random crashes a day apart. So it's just better to keep then under voted a little and do 310 from me.

I'm using 90% power target.
 
4x r290's
(9 items)
 
3x 7970's
(16 items)
 
CPUMotherboardGraphicsGraphics
i7 3930K 4.8Ghz offset ASUS X79 Rampage IV Extreme GTX 780 with EK waterblock GTX 780 with EK waterblock 
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GTX 780 with EK waterblock  Samsung 16GB (4x4gb) 2400Mhz 10-12-12-31-1t @ 1... 256GB Samsung 950 Pro 256GB Samsung 840 Pro 
CoolingCoolingOSMonitor
RX360, EX360, EX360, and 480 Rad's XSPC Raystorm CPU Block Dual boot (other unnamed OS) and Win8 Pro QNIX QX2710 27" 2560x1440 @ 112hz 
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Corsair K90 Corsair AX1200 Corsair 700D Modded w/ External Radiators 
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Other
Thee 16x Risers and One 1x Riser 
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4x r290's
(9 items)
 
3x 7970's
(16 items)
 
CPUMotherboardGraphicsGraphics
i7 3930K 4.8Ghz offset ASUS X79 Rampage IV Extreme GTX 780 with EK waterblock GTX 780 with EK waterblock 
GraphicsRAMHard DriveHard Drive
GTX 780 with EK waterblock  Samsung 16GB (4x4gb) 2400Mhz 10-12-12-31-1t @ 1... 256GB Samsung 950 Pro 256GB Samsung 840 Pro 
CoolingCoolingOSMonitor
RX360, EX360, EX360, and 480 Rad's XSPC Raystorm CPU Block Dual boot (other unnamed OS) and Win8 Pro QNIX QX2710 27" 2560x1440 @ 112hz 
KeyboardPowerCase
Corsair K90 Corsair AX1200 Corsair 700D Modded w/ External Radiators 
CPUMotherboardGraphicsRAM
Intel i5 3570K GA-Z77X-UD3H 4x R9 290's 8GB 1600Mhz 
Hard DriveOSPowerCase
1TB Hard Drive Win8 Corsair Dual PSU - AX1200 and HX650 Open Case 
Other
Thee 16x Risers and One 1x Riser 
CPUMotherboardGraphicsRAM
i7 3930K 5Ghz Bench ASUS X79 Rampage IV Extreme 3x AMD 7970's w/ EK water blocks Samsung 16GB (4x4gb) 2400Mhz 10-12-12-31-1t @ 1... 
Hard DriveCoolingCoolingMonitor
128GB Samsung 830  RX360, RX240, EX360 XSPC Raystorm CPU Block QNIX QX2710 27" 2560x1440 @ 114hz 
KeyboardPowerCase
Corsair K90 Corsair AX760i Corsair 700D Modded w/ External Radiators 
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post #160 of 1291
Thanks for the tips and pointers guys! With your help, I managed to optimize my system even further in terms of power usage: I removed the –H 1 flag, undervolted my CPU (-0.100V compared to stock) and played around in the BIOS and now my power usage is as follows:

Complete System Power Usage
Idle without 750TI installed: 30W
Idle with 750TI OC +135/+635: 34W
Load with 750TI OC +135/+635: 112W

I.e. the 750TI OCed uses 112-30 = 82W under load

For a 6 card setup that would be 6x82 + 30 = 522W, let's say 530W. That’s a difference of 590-530 = 60W compared to before. Nice!

I’m now getting 320 kh/s which is slightly lower than before but still not bad. I have to run Chrome as well, else I get around 300 kh/s.

I’ll be getting my risers this Wednesday if all goes well. Then I can update you with the real world numbers.

Thanks!
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