Bykski GPU Block For Nvidia RTX 4090 AIC (Reference), High Heat Resistance Material POM + Full Metal Construction, With Backplate Full Cover GPU Water Cooling Cooler Radiator Block, N-RTX4090H-X-V2
Bykski GPU Block For Nvidia RTX 4090 AIC (Reference), High Heat Resistance Material POM + Full Metal Construction, With Backplate Full Cover GPU Water Cooling Cooler Radiator Block, N-RTX4090H-X-V2
SKU:N-RTX4090H-X-V2
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The Bykski N-RTX4090H-X-V2 is a full-cover water block engineered specifically for the NVIDIA RTX 4090 reference PCB, targeting AI practitioners running Stable Diffusion, local LLMs via Ollama, and continuous inference workloads that push the 450W TDP for hours or days.
Silence is mandatory for home AI labs. Stock triple-fan coolers scream at 50-60 dBA under sustained load—unusable in bedrooms or shared home offices. This water block drops noise below 30 dBA, letting your RTX 4090 train or generate while you sleep.
VRAM protection prevents throttled output. GDDR6X junction temperatures spike past 90°C during 24/7 inference, causing silent performance degradation. The full-cover design presses nickel-plated copper directly onto all 24GB of VRAM modules and VRMs, eliminating thermal throttling and ensuring consistent token generation.
Multi-GPU builds demand water cooling. Dual RTX 4090s pull 900W+—no air solution exists that fits in a standard case. This block enables dense, air-cooled-impossible configurations for serious local AI acceleration.
Constructed from high-heat-resistance POM and full metal with integrated backplate. G1/4 threading, nickel-plated copper cold plate. Ships worldwide.
Frequently Asked Questions
Is this waterblock compatible with my RTX 4090?
This Bykski waterblock is designed for the RTX 4090. Check the product title for specific card brand compatibility — non-reference PCB designs (ASUS Strix, MSI Suprim, etc.) require model-specific blocks. Reference/Founders Edition cards use a different block.
How much quieter will my RTX 4090 be with water cooling?
Stock RTX 4090 coolers run at 45-65 dBA under sustained AI workloads like Ollama or Stable Diffusion. A full-cover waterblock reduces noise to under 30 dBA — quieter than a refrigerator. VRAM temperatures also drop from 90°C+ to 60-70°C, preventing thermal throttling during long inference sessions.
What else do I need for a complete loop?
Besides this waterblock, a complete custom loop needs: a radiator (360mm minimum for 450W TDP), a D5 or DDC pump with reservoir, G1/4 fittings (8-12 pieces), tubing (soft or hard), and coolant. FormulaMod carries all components — browse our AI Workstation Cooling collection for complete setups.
Can I run this 24/7 for AI inference?
Yes. Water cooling is designed for sustained loads, unlike air coolers which rely on fan speeds that create noise. A properly maintained loop can run 24/7 indefinitely with coolant changes every 12-18 months.
Does FormulaMod ship to the USA and Europe?
Yes. We ship worldwide from our Shenzhen warehouse. USA and EU orders typically arrive within 7 days. All products are covered by our return policy.
Why Water Cool the RTX 4090?
- 24/7 Stable Diffusion inference pushes VRAM to 90°C+ junction; full-cover waterblocks eliminate throttling
- Dual-4090 builds (900W total GPU) are physically impossible in normal cases without water cooling — 3-slot air coolers block each other
- The #1 used-GPU-to-waterblock conversion target — buyers snagging secondhand 4090s want silent 24/7 AI rigs
Full-cover water blocks cool GPU die + VRAM + VRM simultaneously — unlike air coolers that only target the GPU die.
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