A rare prototype of Intel’s Arc A750 graphics card has appeared online, revealing specifications that differ from the officially released model. The sample, obtained by X user komenezumi1006, shows a configuration featuring a 512-bit memory bus, 16 GB of GDDR6 memory, and dual 8-pin power connectors. This design is a major departure from the retail Arc A750, which launched in 2022 with 8 GB of memory and a 256-bit bus interface.
The original Arc A750 belongs to Intel’s first-generation Alchemist Xe-HPG lineup, featuring 28 Xe cores, clock speeds competitive for the midrange GPU segment, and a total board power of 225 watts. The card was positioned below the Arc A770, which shipped in both 8 GB and 16 GB versions with 32 Xe cores. While the Arc A770 16 GB variant matched the prototype’s memory capacity, the bus width on the production cards was limited to 256-bit.
The prototype spotted online carries Intel partner GUNNIR’s branding, which has been responsible for several custom Arc models in the past. The label on the board clearly identifies it as an Arc A750 with 16 GB of memory, suggesting that at one stage, Intel or its partners tested wider memory interfaces on the Alchemist design. A teardown of the card shows only a single GPU retention bracket, ruling out a dual-GPU solution. Previous multi-GPU attempts, such as the Arc Pro B60, used smaller bus widths and combined configurations, making this card notably different.
Cooling is handled by a dual-slot blower-style shroud, while power delivery is supported by two 8-pin PCIe connectors, capable of providing up to 300 watts. This is significantly higher than the official power rating of the Arc A750. In testing, the prototype is detected by Windows with the full 16.0 GB VRAM available, confirming that the configuration is fully functional.
The existence of a 512-bit memory bus on a consumer Arc A750 raises questions about Intel’s early development process for Alchemist. A wider bus would have provided substantially higher bandwidth, improving performance in memory-intensive workloads. However, it would also increase production costs, which may explain why the final retail design reverted to a 256-bit interface while maintaining optional 16 GB capacity on the Arc A770.
At this point, the card seems to be a prototype that never advanced to mass production. Intel’s current GPU roadmap is focused on its upcoming Battlemage series, with the flagship model, expected to be named Arc B770, rumored to retain a 256-bit bus and 16 GB of GDDR6 memory. The Battlemage family is anticipated to bring architectural improvements, efficiency gains, and more competitive performance for the next generation of discrete GPUs.
This discovery offers a glimpse into the early stages of Intel’s discrete graphics program and highlights how hardware designs can shift between prototype and release. While the 512-bit Arc A750 may remain a one-off sample, it reflects the broader experimentation that occurs as companies refine their product strategies.
