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PC Builder Creates an Nvidia RTX 4090 for April Fools' Day and It's Massive

Still can’t find a PC graphics card? Well, one lucky consumer in Denmark jokingly claims he got his hands on Nvidia's upcoming RTX 4090 GPU.

 & Michael Kan Principal Reporter

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(Credit: Kasper Andersen)


A PC builder in Denmark dropped his own April Fools’ joke today by introducing the world to  Nvidia’s RTX 4090 graphics card.  

The giant monstrosity comes from Kasper Andersen, who enjoys modifying old PC parts into new creations. Amid the ongoing GPU shortage, Andersen couldn’t help but poke fun by claiming he received early access to Nvidia’s next-generation graphics card, the RTX 4090.

The RTX 4090 from Kasper Andersen
Credit: Kasper Andersen

The card essentially looks like four RTX 3090s, but all attached together in a massive block of GPU madness. In total, it has 12 fans. The specs for the fake graphics card include 18,000 CUDA cores (or 70% more than the 3090), a 2.16GHz boost clock speed, and a whopping 48GB of GDDR7 video memory. 

To release his April Fools’ joke, Andersen uploaded a video, where he claims Nvidia just announced the RTX 4000 series graphics cards. In the clip, he also takes a dig at the company, noting Nvidia claims it manufactured 21 units of the RTX 4090 at release. “If that’s true, it’s a huge improvement compared to the last generation of cards,” he says. 

"The card is made of all sort of old and defective hardware I had laying around," Andersen told PCMag in an email. "Even 4 of the fans motors on the RTX comes from Pentium II processors as they where just small enough to fit."

However, the outer casing was fabricated over a month and a half using a 3D printer. Andersen then assembled and painted the parts.

Inside the card
Credit: Kasper Andersen

In the video, Andersen also places the massive GPU on a motherboard over the PCIe slot to run a custom graphics benchmark program on a PC. 

We encourage you to watch the video because it’s utterly hilarious when the GPU is in action. The eight fans on one side of the card are so powerful they begin pulling a nearby Pepsi can toward the PC. The air flow accelerates to the point the RTX 4090 accidentally pulls itself into the attached PC monitor, crashing into the screen. In response, Andersen literally tapes down the RTX 4090 to the table with duct tape.

RTX 4090 Ti
Credit: Kasper Andersen

Andersen wasn't content building only an RTX 4090 though. He's also come up with the RTX 4090 Ti, an even larger GPU.

About Our Expert

Michael Kan

Michael Kan

Principal Reporter

My Experience

I've been a journalist for over 15 years. I got my start as a schools and cities reporter in Kansas City and joined PCMag in 2017, where I cover satellite internet services, cybersecurity, PC hardware, and more. I'm currently based in San Francisco, but previously spent over five years in China, covering the country's technology sector.

Since 2020, I've covered the launch and explosive growth of SpaceX's Starlink satellite internet service, writing 600+ stories on availability and feature launches, but also the regulatory battles over the expansion of satellite constellations, fights with rival providers like AST SpaceMobile and Amazon, and the effort to expand into satellite-based mobile service. I've combed through FCC filings for the latest news and driven to remote corners of California to test Starlink's cellular service.

I also cover cyber threats, from ransomware gangs to the emergence of AI-based malware. In 2024 and 2025, the FTC forced Avast to pay consumers $16.5 million for secretly harvesting and selling their personal information to third-party clients, as revealed in my joint investigation with Motherboard.

I also cover the PC graphics card market. Pandemic-era shortages led me to camp out in front of a Best Buy to get an RTX 3000. I'm now following how the AI-driven memory shortage is impacting the entire consumer electronics market. I'm always eager to learn more, so please jump in the comments with feedback and send me tips.

The Best Tech I've Had:

  • My first video game console: a Nintendo Famicom
  • I loved my Sega Saturn despite PlayStation's popularity.
  • The iPod Video I received as a gift in college
  • Xbox 360 FTW
  • The Galaxy Nexus was the first smartphone I was proud to own.
  • The PC desktop I built in 2013, which still works to this day.

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