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GTX 750 Ti mining - Page 34

post #331 of 1291

Those numbers really don't mean anything. If anyone thinks that the power/voltage/current readings provided by GPU-Z are accurate, they're mistaken. Take a look at any review that measures the 265's power consumption with proper equipment. Just the fact that the guy is drawing >200W at the wall with a Sempron CPU should tell you something. Last time I checked, Semprons have all been <40W TDP for the last couple of years.

TPU - R7 265 - Power Consumption
TPU - GTX 750 Ti - Power Consumption
 
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post #332 of 1291

Wow! This would change my mind to buy 750ti!
post #333 of 1291
Quote:
Originally Posted by HardwareDecoder View Post



so you have 6 cards working with this 990fxa ud3 mobo? what revision ? I guess ill try to throw 6 on it in a few hours and report back.....

this is why i buy from amazon, I can just return return these if they won't run 6 cards.

edit: seeing some information that windows 7 can only run 4 gpus and 8 can run 5, so if you run linux you can get 6 working?? Some other people are saying you have to do some presence shorting on the pci-e slots whatever the heck that is.

I have 5 rigs total. All the same rev. 4 of the 990fxa mobo, same bios, same memory, same processor.

Two of the 5 rigs have 6x MSI 750 ti cards in them and work flawlessly, I did not have to change a single setting in the bios, etc. Just loaded windows, loaded drivers, loaded cudaminer and instant joy.

The three remaining rigs have 6 x PNY 750 ti cards in them. One of them works flawlessly, and again, had no issues loading things and getting it working. The remaining two rigs with the PNY's - cards #4 & #5 are recognized, drivers load fine, but for some (unknown to me) reason, cards #4 and #5 are producing 30-40% of what all of the other cards are producing (I'm mining VTC, so good hash on the other cards is 130-135K, whereas the #4 and #5 on the two rigs with issues are running like 40K-90K).

That all being said..

#1. You can absolutely run AT LEAST 6 x 750 ti cards in windows 7. That myth can officially RIP.
#2. The Gigabyte 990FXA mobo can absolutely run 6 x 750 ti cards at full speed, under windows 7, no issues. That myth can officially RIP.
#3. I have no idea how to resolve the issue with card slots #4 & #5. It's not the cards - swapped them around just to be sure, but no matter which card is plugged in to which slot, it's always the cards that show up in cudaminer as #4 and #5 (six total - 0,1,2,3,4,5) that are the issue.
post #334 of 1291
windows still sucks for any production environment anyway I have 6 cards working on one 990 ud3 linux of course gonna setup the other 3 today I hope they all work too. sucks you had to buy all those windows licenses how much does win7 cost now?

BTW you can't offer to tip people for help I got a warning on that my self
Edited by HardwareDecoder - 3/8/14 at 5:10am
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post #335 of 1291
Quote:
Originally Posted by HardwareDecoder View Post

windows still sucks for any production environment anyway I have 6 cards working on one 990 ud3 linux of course gonna setup the other 3 today I hope they all work too. sucks you had to buy all those windows licenses how much does win7 cost now?

BTW you can't offer to tip people for help I got a warning on that my self

Thanks for the heads up about tipping. My bad. I mean no disrespect to the forum.

Windows sucks for production environment vs Ubuntu? Ehhh.. Well, the argument there of *nix vs Windoze could go on for years, but so off topic and so irrelevant to what we're discussing here, I'll forgo even debating it. Let's just say VAR's have access to attractive pricing to the point where, the rest of the arguments aside, cost is not a significant factor when choosing between the two.

And who knows, you might have had the same experience I did if you had 5 rigs set up and going - again, the first 3, no issues. Last 2, issues, and nothing different (well, obviously something, just unknown to me!) thumb.gif
post #336 of 1291
Quote:
Originally Posted by ivanlabrie View Post

You do need to tune settings with cudaminer to get optimal results...for instance, those graphs show 780s pulling 450kh/s, well mine does 716kh/s at 1267mhz core. It's all in the settings thumb.gif

What settings are you using to get this hash rate on the 780?
     
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post #337 of 1291
Thread Starter 

This is kind of offtopic: Warning: Spoiler! (Click to show)
I'd be skeptical since it's a HD7850 rebrand , although it does introduce the ONsemi NCP4206 (to replace the CHiL PWM) which is the same as GK110 kepler boards which push 20 Gflops/W. I'd caution against buying any R7 265 that comes out other than that exact model of Sapphire.

Unless the voltage has been decreased due to a two year old 28nm process , 400 kh/s is reasonable but not on 70-80W , it'll likely be 90-110W. The memory used is 6 GHz Hynix AFR rather than 5GHz H5GQ2H24MFR-T2C used on HD7850 however so not having to overclock memory as far would save some power too.
.
The mosfet improvement can't be that significant so if any large improvements are to be had it's from memory (Renesas R2J20658BNP integrated driver+high+low side is a QFN basically like one of the 40A IR3553 PowIRStages).

What's likely the case is that all the aftermarket HD7850s were using lower efficiency mosfets rather than the reference specced Renesas R2J20658BNP (http://www.renesas.eu/products/discrete/pmosfet/sip/device/R2J20658BNP.jsp).

See http://www.overclockers.ru/lab/51955/Svodnyj_obzor_odinnadcati_videokart_Radeon_HD_7850.html#4 . Every production board there (Sapphire/MSI/ASUS/HIS/Gigabyte/Powercolor/XFX) has Low RDS(on) mosfets instead of the reference design's Renesas integrated driver+high+low side. HIS IceQ might use the Renesas integrated driver mosfet though:

http://www.coolingconfigurator.com/step1_complist?gpu_gpus=1177
Same for Powercolor PCS+


http://www.coolingconfigurator.com/step1_complist?gpu_gpus=797

If you consider HD7850 draw is roughly 100W , 25% reduction seems unlikely with just those minor changes. Maybe with an undervolt (R7 265 is 1.175v boost voltage), but not just those changes.

Edited by AlphaC - 3/8/14 at 7:25am
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post #338 of 1291
This is going to be really dumb-sounding, but what exactly are people laying their motherboards down onto/attaching them to when using shelving or egg crates for cases? I'd love to get my mining going using a bunch of 750 Ti's since they run so quiet and cool. I have the general idea as to what to set them up in, but that one bit is throwing me off.
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post #339 of 1291
Quote:
Originally Posted by GoldenTiger View Post

This is going to be really dumb-sounding, but what exactly are people laying their motherboards down onto/attaching them to when using shelving or egg crates for cases? I'd love to get my mining going using a bunch of 750 Ti's since they run so quiet and cool. I have the general idea as to what to set them up in, but that one bit is throwing me off.

On a flat and non-conductive surface?

Eg: mobo on ground, milk crate flipped upside down on it, GPU on milk crate.
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post #340 of 1291
I went to home depot and had the, cut some of that cheap backer board stuff to line my shelving units.

you could always just cut up cardboard boxes also.
Edited by HardwareDecoder - 3/8/14 at 6:25am
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