Stop wasting precious PCIe space. n3rdware custom-engineered copper coolers shrink your GPU down to a single slot, unlocking maximum compute density for 1U servers, workstations, and ultra-compact SFF builds.

Discover the coolers

The engineering behind the cooler

When you only have one-third of the original volume available for the cooler, physics demands a smarter approach to keep thermals under control. We didn't just shrink the cooler, we re-engineered it from the ground up.

  • Monolithic copper baseplate: While factory stock coolers rely on basic aluminum heatsinks, ours is machined from 100% copper for maximum thermal conductivity across the entire surface.
  • Precision skived fins: Featuring 0.3mm ultra-thin fins with optimized spacing and dimensions. Because the skiving process carves the fins directly from the solid copper block, they remain an uninterrupted part of the baseplate, completely eliminating thermal resistance.
  • Space-optimized fan: A high-static-pressure 55x8mm fan forces air through the fin stack and blows it out of your chassis, preventing hot air recirculation in tight enclosures.

Stock cooler comparison

 Stock coolern3rdware cooler
Thickness2 slots1 slot
1U chassis readyNoYes
Minimum enclosure size3 liter1 liter (eg. Minisforum MS-A2)
Multi-GPUUp to 4 cardsUp to 8 cards side-by-side
HeatsinkSmall aluminum block covering only half of the cardDense copper fin stack covering the complete length of the card
ShroudInjection molded plasticBrushed stainless steel

Some specific scenarios

1U homelab node

Trying to cram a capable GPU into a shallow 1U rackmount chassis? Stock coolers often don't fit or don't allow you to close the lid of the case. The n3rdware kit drops the height below the 1U threshold, letting you install the card with breathing room to spare.

Multi-GPU stacking

Running local LLMs or rendering arrays requires raw GPU compute and lots of VRAM. Stock coolers waste precious space, leaving adjacent PCIe slots unusable. Our custom single-slot coolers let you stack cards directly next to each other, effectively doubling the number of GPUs you can use in the exact same chassis.

Ultra-SFF desktop builds

This kit transforms mid-tier GPUs into compact dwarves, allowing sub-2L high-density builds that easily fit in a little backpack (Lenovo ThinkStation Tiny, Minisforum MS-01, etc.).

Meet the single-slot coolers

Discover more GPU coolers

Want to know more?

No. Let's be entirely honest: a massive dual-slot heatsink has more physical mass. This kit is engineered to run the card at temperatures within spec but compresses that performance into half the physical space. It is a density upgrade, not a cooling upgrade.

No, it is noticeably louder under full load. Because this kit shrinks the GPU to a single slot, the cooler is only one-third the size of the original cooler. To push enough air through the dense copper fins and maintain safe temperatures, the fan must spin at a significantly higher RPM. If a dead-silent system is your priority, this kit is not for you. However, if physical space or multi-GPU density is your bottleneck, this increased noise output is the necessary and logical trade-off.

We currently have single-slot coolers for the following cards:

  • Intel Arc Pro B50
  • Nvidia RTX PRO 2000 Blackwell
  • Nvidia RTX PRO 4000 SFF Blackwell
  • Nvidia RTX 2000 Ada Generation
  • Nvidia RTX 4000 SFF Ada Generation
  • Nvidia RTX A2000
  • Nvidia Tesla T4
  • Nvidia Tesla P4
  • Nvidia Tesla L4
  • 1x skived and CNC-machined pure copper single-slot cooler.
  • All required screws and accessories to mount the cooler.
  • High-quality thermal pads for the memory chips.
  • Stainless steel PCIe brackets for low-profile and standard-height enclosures.
  • Installation manual.
  • (Optional) Installation kit containing a phase-change pad, precision screwdrivers, and an IPA wipe.