Please note that this post is tagged as a rumor.
NVIDIA GeForce RTX 4090 memory overclocked to 25 Gbps
The RTX 4090 may have even more overclocking potential than expected.
We’ve already seen the RTX 4090 operate at a maximum frequency of 3.0GHz or even 3.1GHz and a TDP up to 600W. However, @wnxod’s new screenshot may suggest that the clock speed could go even higher under specific, but unfortunately undisclosed circumstances.
Before we jump to conclusions, the 3.2GHz GPU clock pictured below may not be workable with all cards. In fact, we don’t know anything about TDP settings or the voltage-frequency curve. More importantly, we don’t know what workload was used. Such high clock speeds are usually seen in CPU bound tests, such as low-resolution synthetic benchmarks.
What stands out here is the memory clock. The clock speed of 1562.7 MHz means that the effective memory speed is 25003 Mbps, an overclock of 4 Gbps that increases the maximum bandwidth from 1 TB/s to 1.2 TB/s. Whether this has an effect on the actual performance, we’ll know soon enough when the reviews go live next week.
Such a memory overclock would be even better than on the RTX 3090 Ti, which by the way had the same default memory clock of 21 Gbps. The maximum memory overclocking speed usually reached 1500MHz on high quality custom samples, as tested by TechPowerUP:
Based on the conversations we had with reviewers, it’s relatively easy to break the 3.0GHz clock on the RTX 4090 GPU, but 3.1 or even 3.2GHz may not be that common, especially on power-locked GPUs.
The main question is, how likely is it that RTX 4090 cards will achieve such overclocking settings and is this just an outlier under very specific circumstances, or something extreme overclockers take advantage of in breaking new world records? Those questions will likely be answered on October 11, the date when the first RTX 4090 reviews are published.