Not possible to raise Core voltage for H 7770 Ghz Edition with MSI Afterburner
Not possible to raise Core voltage for H 7770 Ghz Edition with MSI Afterburner
I'm starting to explore overclocking my GPU for the first time. The GPU in question is a Sapphire HD 7770 Ghz Edition, and I'm trying to use MSI Afterburner version 4.2.0. I reviewed the JayZTwoCents video on the topic, but I ran into the initial challenge.
In the video, they unlocked the Voltage control and restarted MSI Afterburner (even restarting my PC when it didn’t help). However, the Core Voltage slider is fully grayed out with an empty box next to it and no number displayed. The video also mentioned a setting for a temperature limit of 91 degrees Celsius under "power Limit %", but I don’t see that option available on my system.
Any suggestions?
The HD 6870 relies on the Barts VLIW5 GPU, whereas AMD introduced a software power limit for GPUs later, like the Cayman VLIW4 used in the 6950, 6970, and 6990 models. It's possible this applies to temperature limits as well. I checked your Sapphire HD 7770 Ghz card and it appears voltage is locked by most BIOS settings; third-party options might bypass it. For best performance, I recommend maximizing overclocking without voltage constraints.
DragonBorn1511 :
Try matching the precise MSI Afterburner version he was using. I discovered 4.1.1 on Guru3D, but it didn’t match his setup (his 4.2.0 looked identical). This prevented me from adjusting the voltage or setting temperature limits. Could be related to the GPU I’m using? Yes, some cards have locked voltage settings.
utroz :
DragonBorn1511 :
Try using the precise version of MSI Afterburner he was using. I discovered 4.1.1 on Guru3D, but it didn’t match his setup (my 4.2.0 looked identical to his). This prevented me from adjusting the voltage or setting temperature limits. Could it be related to the GPU I’m using?
Yes, some cards have locked voltage settings, which might explain this issue.
I switched to a HIS HD 6870, which lets me modify the core voltage, but it still doesn’t let me apply power or temperature restrictions (both are grayed out).
The HD 6870 relies on the Barts VLIW5 GPU, whereas AMD introduced a software power limit for GPUs later, like the Cayman VLIW4 used in the 6950, 6970, and 6990 models. It's possible this applies to temperature limits as well. I checked your Sapphire HD 7770 Ghz card and it appears voltage is locked by most BIOS settings; third-party options might bypass it. For best performance, I recommend maximizing overclocking without voltage constraints.
The HD 6870 relies on the Barts VLIW5 GPU, which predates AMD's software power limit for GPUs. This limitation likely appeared with the Cayman VLIW4 GPU, used in the 6950, 6970, and 6990 models. It’s possible the temperature cap is similar. I checked your Sapphire HD 7770 card, and it appears to be voltage-locked by most BIOS settings—third-party BIOS versions might bypass this. I’d recommend maximizing overclocking without voltage changes for best results.
Thanks a lot for your assistance!
I own a GTX 760 as my primary card, and these are all my older cards. I’m testing them before trying the GTX 760.
The OCed on the 6870 performed excellently with no voltage boost. The core clock increased from 900 to 1000, and memory improved from 1000 to 1100.
However, I’d need to let it run for a longer period to confirm full stability; otherwise, it seemed reliable after about 10 minutes.