This can help if the default power target is limiting your maximum overclock and/or performance you can get out of the card. In fact you can be able to get more out of a non reference card – models with higher clocks by default.

My apologies for the double post as I was unable to edit my previous. I’ve flipped the BIOS switch back and forth to make sure that something wasn’t funky and the one BIOS was not locked and vice versa. Maybe the MSI card isn’t flashable ?

Error Code:8 BCRT_ERROR_CODE_BODY_SIGNATURE_MISMATCH

VBIOS Signature Check failed.

Error Code:7 BCRT_ERROR_CODE_BODY_FNV_HASH_MISMATCH

VBIOS image failed certification sanity check.

BCRT Error: Certificate verification failed

ERROR: ERROR:BIOS Cert Verification Error, Update aborted

The windows version of nvflash will not work (getting the same error message as you are), use the DOS version that is provided in the downloadable archive should have no problems flashing the modified BIOS. We have used the provided version of nvflash for DOS to flash a reference board as well as a Gigabyte GTX 750 Ti with no problems so far.

Just discovered that if you have feedly installed in chrome it keeps it an instance of Chrome running in the background. If you have “Use hardware acceleration when available” enabled, it seems to force all the cards to full speed. I had this on originally and was getting 302 khps in a 5 card EVGA SC rige, but I right clicked on the little icon to disable Chrome from running in the backgroud to free up some memory in the hopes of speeding things up, but suddenly I dropped to a 276 average! Fired up Chrome and it was back to 302 khps. Reenabled “Continue running backgroud apps when Google chrome is closed” and now I don’t have to worry about starting chrome anymore. Hopefully someone smarter than me will figure out a way to force the cards into full throttle without chrome, but this seems to work for now.

5 EVGA SC cards stock bios, Sempron 145 2.8 Ghz, 4GB of RAM, 5 1x-16x powered risers, 750 Watt power supply = 1510 khps @ 52C
Modifying the BIOS improved the rate but the system would not remain stable for more than 10 minutes at a time and temps went up 10 degrees. Returned to stock for now.

Robin, now just run the miner and overclock the card to see if you will be getting better results.

I haven’t flashed my bios yet with Kepler to overclock and i’m only working with 2 of my 6 cards total yet but i have been having stability issues with even minor tweaks to the GPU or Mem. I’m curious what you guys are running on your command line parameters for cudaminer. Here what is in my bat launcher in startup.
cudaminer.exe -d 0,1 -i 0 -o stratum+tcp://us.coinium.org:3334 -u XXX -p XXX -l T10x24 -H2

My system board is a Gigabyte 990FXA-UD3 Revision 4 and the vid cards are Asus GTX 750 TI OC which have better cooling and additional 6 pin PCI-E power inputs on the top
Operating system is Win 7 64 bit pro using Nvidia driver 334.89
I”m not running the cards in the risers yet i’m running them flat on the board in the 16x slots that are further apart to keep them cool for testing purposes.
with the cores at 1215 and mem clock at 2850 using MSI Afterburn i started to get artifacting on the screen. backing the mem back down to 2800 and GPU back to asus stock seemed stable but the cudaminer crashed sometime in the middle of the day. I’m wondering if i got something wrong on my launch config settings for cudaminer

Never mind re-downloaded nvflash and it worked

The Power table goes as follows: TDP, PCI-E slot, PCI-E External Power Connectors (usually one or two), Power Target Range.

Be careful when increasing the PCI-E rails ranges as well as the total power range for more powerful cards like GTX 780, make sure your power supply can handle the limit you set. The TDP and Power Target should have the same total power limits.

If you increase the value of the Max setting over 100 (the Default setting) you will get the Power Target Slider moveable past the 100% limit that is set by default.

sry, it´s me again.

I think maybe my last post was not clear enough,
I try it again.

I am still not sure which field changes what!

We still talking about GTX 750Ti, which have 3 fields to play with.
(scroll up to top of this page and see the screenshot of GTX 850Ti Power Table)

thats why I asked for pointing the fields with “TDP, PCI-E slot, PCI-E External Power Connector”

the answer was:
The Power table goes as follows: TDP, PCI-E slot, PCI-E External Power Connectors (usually one or two), Power Target Range.

well, this are four!
how do they fit in there?

ty

to bad there is no setting for PCI-E slot :(

Will, you can try saving a backup of the video BIOS under dos with the provided nvflash.

I had no problem saving the rom from my gigabyte 750ti oc.
here is the bios file –> http://www.file-upload.net/download-8705696/GM107.rom.html

Nevermind. I have re-read the posts above my own. Duh. Disregard my previous about non-windows version.

Will, you can use this guide to get Hiren’s BootCD on a USB flash drive with DOS as well that you can use to flash the video BIOS under DOS – http://www.hiren.info/pages/bootcd-on-usb-disk

Hello. I have recently purchased the Gigabyte version of 750ti, which i intend to use for gaming and also for mining.
As you might know, it also has a 6pin adapter.

Do you have any suggestion what might be a good tdp-value for me? Should i tweak something in the volt table also?

Hirens USB disk storage doesn’t run. I don’t even know who the hell runs 32 bit OS’s in this day and age, this is pretty useless unless one has the proper OS to run it.

I presume the “mod.rom” is the correct one to use here. However, I am not seeing much of a performance increase on an MSI 750Ti TF by itself. At best I see ~265kh/s though the average is more like it was originally. Is there some other items one might have missed doing this from a DOS command prompt setting besides uploading the “mod.rom”?

@Anton,
as said by admin
March 19th, 2014 at 18:01
In the case of the GeForce GTX 750 Ti it is TDP, PCI-E Rail and Power Target Range.
————————-
i think u could also uncrease the pci-e rail to 75watt which is capable for.
at the other hand, i think the current bios tweaker do not show all power tables, probably one is missing,
in case u use the version with extra pci-e rail connector.
I checked the roms of both versions, roms from internet :)
they all show the same tables, but shouldn´t the extra table be shown if there is an extra connector?

however, the more usage question, you may find in windows the +mhz stable oc
and then adjust the value on the boost table with the slider in the tweaker and flash.
u should get abot 1600 mhz.
I would not hastitate to add heatsinks on the VRMs in the case going to find the maximum clock :)

br

LinuxETC, are you asking for a Linux overclocking guide for Nvidia, or?

LinuxETC, had the impression that you already have flashed the BIOS under DOS, what else do you need help with under DOS?

@admin (follow up):
The GPUs went on a Microsoft Windows 8 system to see what has been done. Kepler BIOS Tweeker shows the “after” photo noted in the Blog post here (i.e., nvflash did work properly with the modified GPU BIOS provided here, thanks!). So the question remains, how are people producing 300kh/s afterwards within the BIOS settings on these GPUs so that the GPU could be put on a Linux mining rig then?

Thanks in advance.

@admin:
For clarification purposes, “+135MHz” is adding + 135MHz, then saving settings to a ROM file and re-flashing the GPU with the “new” ROM file. Correct?

Thanks in advance.

Hey guys does anyone know why my cards are working fine and then the power starts jumping around on 4 (1 remains fine) and my hashrate drops from around 280 down to 150khash.

See http://postimg.org/image/wazglpw2x/

Has anyone tried this with the Gigabyte pre-overclocked model, GV-N75TWF2OC-2GI? When I try to save the bios using GPU-Z, the program crashes and I get the error “BIOS reading not supported on this device.”

Problem Event Name: APPCRASH
Application Name: nvflash.exe
Application Version: 0.0.0.0
Application Timestamp: 530e8e08
Fault Module Name: nvflash.exe
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 530e8e08
Exception Code: c0000005
Exception Offset: 000572c8
OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 1033
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

Is it perhaps because I am trying to run it with Windows 7 64-bit?

Thanks!

I had 6 flashed hashing @ 300kh for a month or two. Had two burn themselves out day before and then another the next day. Temps were fine and I can see some discoloring on the back and one component looks blown-out? Mine were Gigbyte and I used the posted BIOS on this site.

I also have the FTW card. Using Precision software I am able to achieve 1400 core, 3300/6600 memory. Voltage stays at 1.175 same as Gary. Using the over-voltage feature of Precision software does not seem to raise the max voltages, stays at 1.175

GPUZ reports “BIOS reading not supported on this card”

The card stays very cool at 50c full load, but I never see Power Usage % approach anywhere near 100%, usually 50-70% max.

I would really like the raise the TDP and see if I can get the card to use more power.

can somebody post what the watts in power table tab should look like for a gigabyte gtx 750 ti with 6 pin power connection, I’m guessing , the DEF and Max should read 90000 or there abouts. but is that for both the top and bottom entry or just the top entry.

I am trying to do this to lower the minimum fan speed. I am hoping that will make the computer a little quieter. When I open my BIOS in Kepler (v1.26) I can’t make any changes to the fan speed. It is just greyed out. Am I missing a step?

I have a GTX 750 Gigabyte 1GB(with 6-pin PCIe out). But the BIOS format by Gigabyte website is different, its like F12 or something like it, how could i mod my BIOS too? Anyone can help mee?

Probably it is not the TDP that is limiting further overclock, but the GPU voltage…

On some video cards you are just not able to change the voltages.

Can I do this regardless of my Source?

Tried on the gigabyte 750tii 4gb to run ethash as says on betterhash the 750ti is getting 47Mh/s and got 200h/s, so looked into some things and found this, doesnt work unsupported device! Sick on both parts!!!!!!