Radeon Efficiency Guide Part 2: Overclocking while undervolting
In the first part of this guide we saw that undervolting is the method of choice for increasing efficiency and is more suitable for this than pure frequency, power or fps limits. If the (increased) power limit in the Wattman limits the possible stock card performance, undervolted even higher fps are achieved.
If you release the power limit brake, however, the factory voltage has the edge in fps – with correspondingly high consumption.
How can this be changed? Is it possible to save electricity without doing without? Yes. The solution is: overclocking with simultaneous undervolting, in short: OCUV.
[PLUS] Efficiency Guide for Radeon RX 6000 – Don’t be afraid of power limits, undervolting and BIOS mods
This is how it goes on:
- Test program remains 3D Mark Time Spy, but from now on with both graphic tests. Since graphics test (GT) 2 places more load demands on the graphics card than GT 1, consumption will increase.
- The maximum GPU frequency is increased in the Wattman in 25 steps from 2,500 to 2,750 MHz of our exemplary Radeon RX 6900 XT. One pass of Time Spy is performed at each frequency level.
- The power limit in the More Power Tool (MPT) is so high that it does not limit.
- The GPU voltage is set using the Wattman slider (mV Wattman).
- After the run, GPU ASIC Power and GPU Core Voltage are read. In the chart graphics this is shown as W HWiNFO and mV HWiNFO designated.
It starts with the standard voltage of 1,175 mV.
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The following topics can be found in the article:
- Voltage curves and power consumption at 1,175 mV Wattman
- Voltage curves and power consumption at 1,075 mV Wattman
- Voltage curves and power consumption at 950-1025 mV Wattman + MPT
- Overall comparison: consumption and Time Spy graphic points
- VRAM OC and undervolting
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