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GTX 750 Ti mining - Page 31

post #301 of 1291
Quote:
Originally Posted by UNOE View Post


I'm not sure about AMD like I said but

In the
Motherboard Manual of ga-z87x-ud4h

Page 57 - fourth entry (says)

PCIE Slot Configuration
Specifies the operating bandwidth for the PCIEX4 slot.
Auto Lets the BIOS automatically configure this setting depending on the expansion card being
installed. (Default)
x1 PCIEX4 operates at x1 mode.
x4 PCIEX4 operates at x4 mode


I was only able to get one board to see 5 cards with x1 mode enabled

There is also a mention in this bios manual that the x1 slots only support up to Gen2 mode.


Page 49 ...

PEG Gen3 Slot Configuration
Allows you to set the operation mode of the PCI Express slots to Gen 1, Gen 2, or Gen 3. Actual operation
mode is subject to the hardware specification of each slot. For example, the PCI Express x1 slots can
support up to Gen 2 mode only. Auto lets the BIOS automatically configure this setting. (Default: Auto)

thanks for the info, there is no such setting that i've seen on the 990 fxa ud3.
Doesnt matter to me though since atleast on the first of 5 of them I have all 6 cards worked with no tweaking.
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post #302 of 1291
Quote:
Originally Posted by HardwareDecoder View Post

ill give you guys a hint for overclocking in the bios (atleast on the gigabyte 750ti rev 1.0) it's all about #54 baby!

Did you mean in the BIOS for motherboard or BIOS in the ROM file?
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post #303 of 1291
Quote:
Originally Posted by dotaduck View Post

Did you mean in the BIOS for motherboard or BIOS in the ROM file?

video bios
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post #304 of 1291
Quote:
Originally Posted by HardwareDecoder View Post

video bios

For Kepler BIOS tweaker, I know how to do the TDP trick as well as boost the mem clock.

Could you please share how you successfully increased the GPU CLK? I haven't had much luck there.

For getting six cards running on motherboards without discrete PCIe lane width settings, I recommend you DISABLE ALL ONBOARD DEVICES

e.g., hard drive controllers, on-board audio, USB controllers/ports...EVERYTHING that you don't need. Typically the onboard devices compete for resources with the PCIe slots.
post #305 of 1291
Quote:
Originally Posted by gfgrimm View Post

For Kepler BIOS tweaker, I know how to do the TDP trick as well as boost the mem clock.

in the clock table it is #54
Could you please share how you successfully increased the GPU CLK? I haven't had much luck there.

For getting six cards running on motherboards without discrete PCIe lane width settings, I recommend you DISABLE ALL ONBOARD DEVICES

e.g., hard drive controllers, on-board audio, USB controllers/ports...EVERYTHING that you don't need. Typically the onboard devices compete for resources with the PCIe slots.
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post #306 of 1291
Quote:
Originally Posted by Twinkadink View Post


Just have latest gpu-z and right click the bar

Had no idea it was that easy to check ASIC quality...now I need to learn the implications of what i means. Thank you!
post #307 of 1291
Quote:
Originally Posted by HardwareDecoder View Post

so everyone that had riser issues found out it was windows 8 to blame it seems? I heard some tell about amd boards being the culprit but I kind of discount that, lets hope anyway I have 4 gigabyte 990 ud3 boards ready to go for the 24 gigabyte 750ti i'm getting tomorrow.

Gonna install windows 7 x64 to an ssd and clone it for all the rigs.

No, there were two issues. Win8.1x64 + Nvidia driver = scaling and stability issuse.
Then there was also the performance hit caused by operating in x1 mode...doesn't matter if you are on a riser or plugged into an x16 slot...if you force the slot to operate in x1 mode, the performance hit is the same.
post #308 of 1291
Quote:
Originally Posted by SwarmJAG View Post

gigabyte ga990fxa-ud3 rev4 , powered usb3 risers. So far all the 4x and 16x slots work fine. The 1x slots only work if its the only card or if in a pair.and then in pair it only gets full hash if using a jumper.

Screwed around with it this morning before leaving for work but still no luck. Read somewhere about mboard utilities that let you control the pci slots. Will see what I can find on that. Left 4 cards farming

COuld you describe what is full hash and what is not? I'm guessing that this does not mitigate the x1 mode performance hit.
post #309 of 1291
Quote:
Originally Posted by gfgrimm View Post

No, there were two issues. Win8.1x64 + Nvidia driver = scaling and stability issuse.
Then there was also the performance hit caused by operating in x1 mode...doesn't matter if you are on a riser or plugged into an x16 slot...if you force the slot to operate in x1 mode, the performance hit is the same.

well I'm only losing about 100 khash out of about the total 1800 I could have in a 6 card rig. thank god I don't have to use windows in a production environment. ssh is a godsend and Linux is much more stable. so x1 isn't hurting too bad on linux
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post #310 of 1291
Quote:
Originally Posted by HardwareDecoder View Post

well I'm only losing about 100 khash out of about the total 1800 I could have in a 6 card rig. thank god I don't have to use windows in a production environment. ssh is a godsend and Linux is much more stable. so x1 isn't hurting too bad on linux

Well, really, I'd assume we should see 320 per GPU with the x1 bottleneck fixed, so I'd really be targeting 1900 kH/s. At least, I don't have a problem gettings cards to 320 in a x16 slot running at PCEi 3.x x16 mode.

The best I've seen so far with a riser is 315 kH/s ...which hurts me because I know it probably does 330-340 running in x16 mode on a board slot.
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