The GALAX GeForce RTX 5090D has become the first NVIDIA Blackwell GPU to reach a 4 GHz overclock, a milestone reached by Greek overclocking group Team OGS. Using the GALAX HOF OC LAB edition, the team pushed the graphics card beyond previous limits in an official HWBOT benchmark run, confirming a core clock speed of 4002 MHz. This achievement stands as the highest frequency ever recorded on a GPU from NVIDIA’s latest Blackwell architecture.

Unlike the recent V2 variant of the RTX 5090 which features reduced core and memory configurations, the overclocked card used by Team OGS retains the full specifications of the standard RTX 5090. Equipped with an advanced 36-phase power design and dual 16-pin power connectors, the GALAX HOF OC LAB variant provides enthusiasts with robust power delivery crucial for extreme overclocking.

The breakthrough also depended on hardware modifications: the team replaced the GPU’s default 27 MHz clock crystal with an Elmor External Clock Board (ECB), allowing them to override the onboard clock source. This adjustment increased the clock reference to 28.7 MHz—an improvement of over 6%—which proportionally boosted all GPU and memory frequencies, including the VRAM clock rising to 1860 MHz from the base 1750 MHz. This setup pushed the VRAM bandwidth close to 30 Gbps.

The overclock was validated in the GPU-centric GPUPI v3.3 - 32B benchmark, where the RTX 5090D completed the test in 35 seconds and 377 milliseconds, improving upon previous records by over a second. Before this, the highest clock speed recorded on the RTX 5090 lineup was 3.88 GHz, achieved by top overclocker Splave.

While NVIDIA’s Blackwell GPU sets a new personal record with this 4 GHz mark, AMD still holds the overall highest GPU frequency with a Radeon RX 9060 XT clocked at 4.769 GHz. Nonetheless, this achievement highlights continued progress in extreme GPU overclocking and the capabilities of GALAX’s specialized HOF OC LAB hardware.

Team OGS credits partners including GALAX, ASUS, Corsair, Bitspower, and Thermal Grizzly for their support during this overclocking session, which utilized LN2 cooling technology to maintain stable operation at such extreme frequencies. The success showcases both the overclocking potential of Blackwell GPUs and the specialized equipment required to push these chips beyond their factory limits.