Overclock.net - An Overclocking Community - View Single Post - [Official] NVIDIA GTX 780 Owner's Club
View Single Post
post #24961 of (permalink) Old 09-20-2018, 08:04 AM
Currency Lad
Linux Lobbyist
Currency Lad's Avatar
Join Date: Nov 2013
Posts: 17
Rep: 1 (Unique: 1)
Quote: Originally Posted by kithylin View Post
Quote: Originally Posted by Currency Lad View Post
Thanks for your response.

I know that BIOS editing tools for the Kepler series have been around since the release of GTX 780 but these weren't without their own problems.

The skyn3t BIOSes have been available since the start of this thread and successfully used by many users. They edit at a deeper level than Kepler BIOS Tweaker can achieve. Specifically, they disable GPU Boost 2.0 and allow a higher power target, enabling higher stable overclocks. You would need to research the earliest posts in this now 2500 page thread (particularly skyn3t's and OccamRazor's posts) for details.

I myself successfully used skyn3t's BIOS for my own water-cooled GTX 780 cards back in the day (running GTX 1080Ti now).

This request obviously wasn't for myself but for a nephew who has a pair of EVGA reference cards in SLI that he wants to get more out of.

Having said all that, I welcome your offer and will happily post his GPU BIOS when I find the time to work on them.
I did not know any of this. I was under the impression we can easily disable the power limits in kepler bios editor by just setting some high amount the card will never be able to reach (no matter how far you overclock it) like 600 watts, and then just flash it. Also, you never want to completely disable boost. You generally want to just raise the boost clock higher. But, I've had problems with my EVGA classified GTX 780 not applying the voltage I specify in kepler bios tuner so maybe the program doesn't tune everything it's supposed to. It does seem to at least disable power limits though.
No worries.

GPU Boost 3.0 (and presumably the new GPU Boost 4.0 for the 20 series) works much better than GPU Boost 2.0 under Kepler. It's been a while since I had my 780s so perhaps GPU Boost 2.0 works better with the latest drivers - I don't know.

But back in the day, GPU Boost 2.0 was an absolute pain to get a high stable overclock with - that's why there was an advantage to disabling it. Skyn3t's BIOSes (they were tailored for each card) allowed you to run at your highest stable overclock all the time provided you had the headroom. I forgot to mention they also unlocked the voltage to a maximum 1.212V (up from nVIdia's default 1.168V). Unfortunately, Kepler was the last generation that could be successfully edited at the low level that skyn3t did it.

If I recall correctly, I was able to get a stable overclock of 1350MHz on the core and 7200MHz on the memory with my cards using skyn3t's BIOS. Other people couldn't achieve better than say 1200MHz on the core and 6500MHz on the memory, so your mileage may vary. The silicone lottery still applies.

I recall people posting similar problems with Kepler BIOS Tweaker not applying the set voltages correctly as you mentioned and also recall problems with the power tables. You might want to research some of the earliest posts in this thread for information (just do a search for KBT within the thread).

If you're interested, all the info and links to skyn3t's BIOSes are on the first page of this thread. Just proceed with caution and use common sense. Backup your own BIOS first in case something goes wrong (use NVFlash - GPUZ doesn't always backup correctly). Then you can always reflash back provided you have access to another GPU (any one will do) and a 2nd PCIE slot on your motherboard.

Don't do the LLC mod (it was discovered later to cause instability) and don't up the voltage beyond 1.3V unless you have extreme cooling, especially on the VRMs. On air you don't want to go above 1.212V.

Be sure to read OccamRazor's guide on the first page and also check out some of his posts. He was super super helpful to many users back in the day.

Have a good one!

Last edited by Currency Lad; 09-20-2018 at 08:35 AM.
Currency Lad is offline