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post #151 of 1291 (permalink) Old 03-02-2014, 09:37 PM
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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
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post #152 of 1291 (permalink) Old 03-02-2014, 09:38 PM
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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
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post #153 of 1291 (permalink) Old 03-02-2014, 09:56 PM
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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.
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post #154 of 1291 (permalink) Old 03-02-2014, 10:04 PM
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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...
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post #155 of 1291 (permalink) Old 03-02-2014, 10:15 PM
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They are all on 1x-16x powered ribbon risers


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post #156 of 1291 (permalink) Old 03-02-2014, 10:37 PM
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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.

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post #157 of 1291 (permalink) Old 03-02-2014, 10:44 PM
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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.
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post #158 of 1291 (permalink) Old 03-02-2014, 11:28 PM
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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.
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post #159 of 1291 (permalink) Old 03-03-2014, 12:54 AM
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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.


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post #160 of 1291 (permalink) Old 03-03-2014, 02:30 AM
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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!

post-flame-small.gif Intel i7 920 d0 @ 4Ghz :: At stock volts, on air, with HT enabled post-flame-small.gif
:::: CPU-Z Validation proof.gif ::::: 500x LinX Stable proof.gif ::::


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