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GTX 750 Ti mining - Page 29

post #281 of 1291
Quote:
Originally Posted by HardwareDecoder View Post

what gigabyte board was it ?

It was a gigabyte ga990fxa-ud3 rev4 . Someone suggested that some boards in the bios you have to manually set the pcie slot to 1x. I dug in the bios this morning and couldn't find anything. Tried it this morning again as the fifth card in the system of 4 that had been working. All 5 slots using powered usb 3 risers. I tried that fifth 1x slot with and without a jumper but either way it didnt work. What's wierd is it worked fine when it was just used by itself with 1 card or as the 2nd card when I ran 2. Did some more digging this morning and somewhere I read about chipset utilities that might be installed in windows
Quote:
Originally Posted by HardwareDecoder View Post

good tip on the gigabyte boards btw, I want to have no problems tomorrow trying to run 6 per rig, does that x1 thing apply to 990 chipset gigabyte boards?
Quote:
Originally Posted by HardwareDecoder View Post

good tip on the gigabyte boards btw, I want to have no problems tomorrow trying to run 6 per rig, does that x1 thing apply to 990 chipset gigabyte boards?

Quote:
Originally Posted by UNOE View Post

Some Gigabyte boards just need to be set to "PCIe x1" in the bios to see more than 4 cards.

The default settings is x4 and it only allows 4 cards to be seen.

I looked all over in the CMOS bios for a setting to change this and couldn't find anything. Is it a utility perhaps on the motherboard driver disk?
post #282 of 1291
Quote:
Originally Posted by SwarmJAG View Post

It was a gigabyte ga990fxa-ud3 rev4 . Someone suggested that some boards in the bios you have to manually set the pcie slot to 1x. I dug in the bios this morning and couldn't find anything. Tried it this morning again as the fifth card in the system of 4 that had been working. All 5 slots using powered usb 3 risers. I tried that fifth 1x slot with and without a jumper but either way it didnt work. What's wierd is it worked fine when it was just used by itself with 1 card or as the 2nd card when I ran 2. Did some more digging this morning and somewhere I read about chipset utilities that might be installed in windows


I looked all over in the CMOS bios for a setting to change this and couldn't find anything. Is it a utility perhaps on the motherboard driver disk?

ya the only pci-e related option I even see is for which pci-e slot to display video from


this SUCKS I thought I was buying good quality 6 card capable motherboards.....

I just went and put chips and heatsinks and ram etc in all of them cause i got 24 of these cards coming later today from UPS.

I bet amazon will take them back still though biggrin.gif

On a good note, I definitely figured out how to overclock core/mem/tdp in the bios for these cards and the gigabyte ones are NOT locked to +135 mhz on the core. Got one running at 1267 core and 6024 mem right now.
Edited by HardwareDecoder - 3/7/14 at 4:41am
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post #283 of 1291
what is a good socket am3+ mobo that WILL run 6 cards? im sending these boards back. All 4 of them.
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post #284 of 1291
Having a related issue with this.. Same mobo. I bought 2 initially, along with 12 MSI GTX750 Ti's... Worked flawlessly, no issues, each card pushing 130k+ VTC with cudmainer... All 6 cards per rig running full speed.

Bought 3 more mobo's (same Gigabyte 990), and 18 more cards. Only, this time I bought PNY cards cause the MSI were out of stock at the time. Loaded up the first rig, no problems. The other two - cards 4 & 5 (as seen by cudaminer) run at like 40K and 100K no matter what I do.. They were seen by the system, windows drivers loaded no problem, but no matter what I do, in those last two rigs, cards 4 & 5 just won't push past those crazy low rates.

I don't understand how 1 out of 3 runs fine, but the other two do not. I checked bios revisions, driver revisions, etc. Everything matches, makes NO sense. And there's something specific about the fact its cards 4 & 5 consistent between the two rigs giving me problems.

Using Asus GPU Tweak, I can see the GPU usage is low in the 4 & 5 cards, as is the FB.. If anyone has any ideas, I'm all ears and would be happy to throw some VTC your way for a solution! thumb.gif
post #285 of 1291
Quote:
Originally Posted by 79cj7jeep View Post

Having a related issue with this.. Same mobo. I bought 2 initially, along with 12 MSI GTX750 Ti's... Worked flawlessly, no issues, each card pushing 130k+ VTC with cudmainer... All 6 cards per rig running full speed.

Bought 3 more mobo's (same Gigabyte 990), and 18 more cards. Only, this time I bought PNY cards cause the MSI were out of stock at the time. Loaded up the first rig, no problems. The other two - cards 4 & 5 (as seen by cudaminer) run at like 40K and 100K no matter what I do.. They were seen by the system, windows drivers loaded no problem, but no matter what I do, in those last two rigs, cards 4 & 5 just won't push past those crazy low rates.

I don't understand how 1 out of 3 runs fine, but the other two do not. I checked bios revisions, driver revisions, etc. Everything matches, makes NO sense. And there's something specific about the fact its cards 4 & 5 consistent between the two rigs giving me problems.

Using Asus GPU Tweak, I can see the GPU usage is low in the 4 & 5 cards, as is the FB.. If anyone has any ideas, I'm all ears and would be happy to throw some VTC your way for a solution! thumb.gif

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.
Edited by HardwareDecoder - 3/7/14 at 5:14am
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post #286 of 1291
So the article on pcper on mining with the gtx 750 ti the drove me to purchase this mboard did not say what revision. But I was able to read the revision from the picture. It looks like he was using a revision 1.0 board with 6 video cards. I wonder if you can flash the bios from a revision 1 over a rev 4 board?

Here is the pic http://www.pcper.com/image/view/37520?return=node%2F59607
Edited by SwarmJAG - 3/7/14 at 5:23am
post #287 of 1291
WAIT A MINUTE, SOMETHING IS FISHY. I forgot I have one of these 990fxa ud3 boards in my 280x farm, maybe more than one but I just went to go look and I definitely have one running 5x 280x....

on the first 5 pci-e slots, only the last slot im not using on that rig. it is a revision 4, so they can definitely do atleast 5 cards on linux, most likely 6....
Edited by HardwareDecoder - 3/7/14 at 5:29am
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post #288 of 1291
Quote:
Originally Posted by SwarmJAG View Post

So the article on pcper on mining with the gtx 750 ti the drove me to purchase this mboard did not say what revision. But I was able to read the revision from the picture. It looks like he was using a revision 1.0 board with 6 video cards. I wonder if you can flash the bios from a revision 1 over a rev 4 board?

Here is the pic http://www.pcper.com/image/view/37520?return=node%2F59607

A rev 4.0 board is physically different than the previous boards, I wouldn't expect it to work. On a side note, I have at least one rev 3.0 board that I picked up recently that seems to work fine with a non- powered 1x riser in every slot. However at this point I have not tested all six at once. I'll get to that when my next batch of cards comes in.

Also, is everyone disabling all nonessential peripherals in the BIOSs? The first thing I do when I setup a new miner is to disable ALL unused USB controllers, serial ports, eSATA, SATA, Audio, etc.. I always assumed those were essential steps to freeing up resources for large numbers of VGA cards in Windows.
post #289 of 1291
Quote:
Originally Posted by SR20DEN View Post

A rev 4.0 board is physically different than the previous boards, I wouldn't expect it to work. On a side note, I have at least one rev 3.0 board that I picked up recently that seems to work fine with a non- powered 1x riser in every slot. However at this point I have not tested all six at once. I'll get to that when my next batch of cards comes in.

Also, is everyone disabling all nonessential peripherals in the BIOSs? The first thing I do when I setup a new miner is to disable ALL unused USB controllers, serial ports, eSATA, SATA, Audio, etc.. I always assumed those were essential steps to freeing up resources for large numbers of VGA cards in Windows.

Hmm awesome idea. I think I only disabled the on board sound. I will disable everything tonight and try it.
post #290 of 1291
So the king of crypto has entered the building, HOORAH HOORAH.

6x 750ti working on linux, all overclocked to 1359 core / 6024 mem -- hash rate went up a bit to 1750 after I took the picture.
HOORAH HOORAH

I will now accept pledges of fealty

Edited by HardwareDecoder - 3/7/14 at 10:14am
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