Can you disable the voltage cap for the RX 6800 XT?
Can you disable the voltage cap for the RX 6800 XT?
Hello, I recently acquired a STRIX LC RX 6800 XT with a 240mm AIO. Can anyone suggest a way to unlock the voltage limit (1150mV)? I reach up to 2675MHz but would like to hit at least 2700MHz. The temperatures during gaming are very good, with a max hotspot of 75 degrees, so I’m considering increasing the core clock. To do this, I need to raise the voltage. Do you know if there’s any software that allows this without modifying the BIOS? Thanks in advance.
AMD RX 6800 Overclocking and Undervolting – from over 240 watts down to under 180 watts, the possibilities are clear | igor´sLAB
The maximum overclocking for the Radeon RX 6800 XT isn’t very high, so the more affordable version seems even more appealing. But you won’t be able to achieve anything extraordinary here either…
www.igorslab.de
perhaps with this tool it might work
Yes, you're correct. Setting the MVA limit to 1200 would likely require adjusting the power and TDC limits accordingly.
There isn't much, since at least from what I've understood, the drivers set a 1.2V limit. And unless you're aiming for e-peen points on 3DMark or something similar, 25MHz alongside 2675MHz won't make much difference in game performance.
Undervolting often delivers superior performance compared to overclocking, particularly when a higher voltage is required for stability. This happens because the GPU faces thermal constraints due to insufficient heat dissipation from the die; this issue is increasingly relevant with 7nm and smaller designs. Liquid cooling can assist, but the main challenge remains extracting heat from the silicon. The 1.200V threshold becomes less critical unless experimenting with advanced methods like LN2 cooling for overclocking tests.
There are also boundaries to how much you can lower the voltage. Most 6800XT models can be reduced to about 1.050V. While I meet benchmarks at that level, I encounter problems such as audio distortion and boot failures, so I keep it around 1.075V. Running at 1.125V is necessary for Folding@Home, which demands precise GPU performance to prevent processing errors and unit failures.
If you're keen on pushing your rig into extreme overclocking territory, focus on tools like More Power Tool and Red Bios Editor. These solutions help bypass hardware limits and expand the power budget. However, this approach can quickly strain your power supply or even damage your entire system if not managed carefully.
So… would a 2600mhz 1100mv setting be better than 2675mhz 1143mv? Just an example. I believe this applies mainly to heavy benchmarks like time spy, since in games I usually have less than 75 degrees of deviation from the hotspot.
For MY card, the lower clock/voltage setting seems ideal. However, my 6800XT (MSI Gaming Z Trio) is equipped with an air cooler and tends to overheat at high clock and voltage settings that reduce clock speed. I've discovered that 2500Mhz and 1075mV provide the best overall performance for gaming, though 2450MHz is even better. For your setup, I can't pinpoint a specific 'sweet spot' since you're using an AIO cooler.
You should run benchmarks to evaluate performance accurately. The recommended benchmark is TimeSpy. When comparing scores, focus only on the Graphics score rather than the Total score, which includes CPU performance. You might also try running your game's BM routine if available.
Regardless of the clock speed you choose, lowering the voltage can improve performance. Reducing voltage helps maintain cooler temperatures, preventing the card from slowing down under heavy load. If overheating becomes an issue—such as a hotspot exceeding 100°C and causing significant clock slowdowns—consider reducing the card's power budget slightly.
It seems my setup isn't ideal, but I'm stable at 2675mhz with 1137/1143mv and a max angle of 82 degrees near the hotspot while running. The performance is solid—10400/10500 points on GPU, which is better than most. However, I might consider reducing the clock speed and voltage to see how it affects results.