The 12VHPWR connector standard delivers up to 600 W to a single GPU — necessary for RTX 4090 and 4080 cards that draw sustained power during AI inference workloads. This 16AWG cable converts three standard 8-pin PCIe connectors from your PSU into a single 12+4 pin 12VHPWR output, letting you use a current-generation power supply with a PCIe 5.0 card without replacing the PSU.
16AWG wire gauge is the right spec for this application. Thinner cables are a genuine fire hazard at sustained 300–600 W draw; the early melt failures seen on third-party 4090 cables were directly caused by undersized conductors and poor seating. This cable is built to handle continuous high-draw operation — the kind of load that a local AI workstation sees when running inference or Stable Diffusion image generation for hours at a time.
Compatible with RTX 3090 Ti, 4070 Ti, 4080, and 4090 cards. Includes wire combs for a clean, organized build. At 17.7 inches, it reaches from most PSU modular panels to GPU power connectors without excess slack cluttering the cable management space. One cable, one clean connection, rated for the load your AI workstation actually demands.
Frequently Asked Questions
Is this waterblock compatible with my RTX 4090?
This FormulaMod 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?
450WTDP under AI load
24GBVRAM (throttles at 92°C)
<30dBWith water cooling
- 450W sustained AI load = 50-60 dBA from the massive triple-fan coolers — unbearable in bedroom/home office
- 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.
