Team OGS Overclocks NVIDIA GeForce RTX 5090D to 4 GHz
Overclocking team Team OGS pushed a GALAX HOF OC LAB GeForce RTX 5090D to 4002 MHz, becoming the first NVIDIA Blackwell-architecture GPU to break the symbolic 4 GHz core-clock barrier, according to Wccftech and Guru3d. The team replaced the card's stock 27 MHz clock crystal with an Elmor external clock board (ECB) set to 28.7 MHz, a 6.3% increase that raised GPU and memory clocks together, pushing GDDR7 memory to 1860 MHz. Running liquid nitrogen cooling, the card completed the GPUPI v3.3-32B benchmark in 35.377 seconds, beating the prior Blackwell record of 3.88 GHz set by overclocker Splave. The result is a liquid-nitrogen-only extreme benchmark, not representative of normal operation, but it maps the practical clock and power-delivery headroom of the underlying GB202 silicon.
Extreme overclocking records like this are a low-stakes but genuine signal of silicon headroom: they show what the same GB202 die powering the consumer RTX 5090 can sustain under ideal power delivery and cooling, which is the ceiling engineers reference when evaluating how much thermal and power margin a design has left.
What happened
Team OGS used a GALAX HOF OC LAB variant of the NVIDIA GeForce RTX 5090D to reach a validated 4002 MHz GPU core clock, the first Blackwell-based GPU to cross 4 GHz, according to Wccftech and Guru3d. The card's GDDR7 memory ran at 1860 MHz (about 30 Gbps effective), and the session, cooled with a Bitspower Strata LN2 pot and Thermal Grizzly Kryonaut Extreme paste, completed the GPUPI v3.3-32B benchmark in 35.377 seconds - beating the previous best of 3.88 GHz set by overclocker Splave by more than a second on that benchmark.
Technical context
To hit the record, Team OGS replaced the card's stock 27 MHz clock crystal with an Elmor External Clock Board (ECB) set to 28.7 MHz, a 6.3% increase that raises every GPU-related clock domain simultaneously, memory included. The GALAX HOF OC LAB board used for the run features dual 16-pin power connectors and a 36-phase VRM designed specifically for this kind of extreme, LN2-cooled benchmarking rather than everyday use.
For practitioners
This result has no direct bearing on production AI training or inference workloads - it is a synthetic, LN2-only benchmark run - but it is a useful reference point for the practical clock ceiling of Blackwell silicon and for teams evaluating custom-cooled or overclocked workstation builds. NVIDIA does not hold the outright GPU frequency record; AMD's Radeon RX 9060 XT reportedly reached 4.769 GHz earlier in 2026 under similar extreme conditions.
What to watch
Whether other overclocking teams replicate or beat the 4 GHz mark on RTX 5090-class silicon, and whether the ECB clock-generation technique used here sees any adoption in mainstream workstation or benchmarking tools beyond the extreme-overclocking community.
Key Points
- 1Team OGS overclocked a GALAX HOF OC LAB RTX 5090D to 4002 MHz, the first Blackwell GPU past the 4 GHz mark.
- 2An Elmor external clock board set to 28.7 MHz raised GPU and memory clocks together, pushing GDDR7 to 1860 MHz.
- 3The LN2-cooled, synthetic-benchmark result has no production relevance but marks a practical Blackwell silicon ceiling.
Scoring Rationale
Niche GPU extreme-overclocking milestone for the enthusiast/OC community; uses LN2 and specialized external-clock hardware not representative of production conditions. It has no direct AI/ML practitioner relevance beyond a headroom data point on Blackwell silicon, so it stays in the minor-interest band.
Sources
Primary source and supporting public references used for this report.
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