A while back I purchased a Gigabyte GTX560 Ti SOC “Super Overclock” that has a 1 GHz core. This card is a monster and had amazing reviews, so I picked one up. Unfortunately timing wasn’t great and I left for a three week business trip. I switched to this card for lower power consumption, before letting my computer run Folding@Home for the duration I was away.
About one week into my trip I noticed that my PC stopped producing work units. Curious, I did a bit of research and found that they changed the core required for bigadv units. OK, so that explained my PPD drop, but not the total halt.
When I returned home, my PC was stuck at a black screen, fans/etc still whirring away.
Reboot, and it froze at the Windows logon screen. Consistently after every reboot. I uninstalled the video drivers in safe mode and it worked fine. Re-install and same crashing behaviour.
I shut the PC down to go unpack and let it stir around in my mind for a bit.
When I returned, I powered on the PC and it worked no problem. That is, until I fired up Crysis 2. I could not get past the intro portion where you need to run through the train being filled with water.
Only after lowering the clock speeds to 950Mhz did it function properly. This has been reported on a number of forums, and is likely the reason why Gigabyte stopped producing this 1GHz SKU.
For the last few months I had been using MSI Afterburner to manually adjust the clocks. But now that I am trying to settle everything, I’ve finally decided to perform a BIOS edit.
This proved to be a little bit tricky, as my BIOS size is actually 62,464 bytes instead of the ones found on TechPowerUp being 65,535 bytes.
To perform the edit:
- Dump the BIOS using GPU-Z
- Grab a BIOS from TechPowerUp with the desired clock speeds and load it in NiBiTor
- Tools -> Fermi Clocks. Here I am matching with the Gigabyte GTX560 Ti SC 950 Mhz version. The numbers that changed are 1900 (core), and 2019 (no clue!)
- Load your BIOS dump into NiBiTor and edit the clocks.
- Boot to your USB and flash with nvflash
- Remove protection: nvflash -r
- Erase existing programming: nvflash –eraseeeprom
- Flash new BIOS: nvflash -4 -5 -6 new.rom
- Reboot and enjoy!