A $50 Alibaba FPGA Card Just Became an Open-Source Network Card

Google security researcher Laurie Wired just proved that one person's trash is another's $2,000 FPGA. On X, they showed off a retired Alibaba Cloud FPGA accelerator picked up on Xianyu — China's secondhand marketplace — for just 355 RMB (about $50). The card uses an AMD / Xilinx Kintex UltraScale+ XCKU3P chip.

For comparison, a similarly configured XCKU3P-2FFVB676E bare die from Mouser is listed at $2,137.01. That's not a direct "$50 buys a $2,000 chip" — distributor prices for programmable logic are notoriously inflated (bulk orders often land at $100–200), and the Xianyu card is a used, out-of-warranty unit. Still, for FPGA enthusiasts, it's an incredible deal.

The card, known in the community as AS02MC04, packs PCIe Gen3 x8 and dual SFP+ cages, and the chip is supported by the free version of Vivado. Its hardware specs blow away any entry-level dev board in the same price range.

Originally, this card had no official schematics or manuals — a total "blind buy." Early adopters painstakingly reversed-engineered its JTAG, pinouts, and clock definitions. Now the open-source networking platforms Corundum and taxi have officially added support for it. Developers can turn it into a fully open-source FPGA NIC for 10G / 25G Ethernet and in-network computing experiments.

Retired big-tech hardware is making its way to the used market, dramatically lowering the barrier to entry for hobbyists who want to play with high-end FPGAs.