NVIDIA 50 EVGA Z690 Fix
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Sourcehttps://www.reddit.com/r/TEAMEVGA/comments/1l6rg2d/workaroundfix_for_50series_gpus_on_evga_z690/
Users of EVGA Z690 and some Z790 motherboards are encountering widespread boot failures when installing NVIDIA 50-series GPUs, including models like the 5080FE, 5090, and 5070 Ti. This issue stems from EVGA's unique wiring of the optional PCIe SMBUS pins (pins 5 and 6) on these motherboards. These pins are typically not wired on most consumer boards as they are optional and lack a defined standard for usage. However, EVGA's decision to connect them allows the GPU to interfere with the motherboard's boot sequence, most likely during RAM detection, often resulting in looping 0A and 7F POST codes. Other motherboard brands do not exhibit this specific incompatibility.
A community-developed workaround has proven effective for many affected users. This involves insulating pins 5 and 6 on the GPU's PCIe connector using a 2mm-wide strip of electrically-insulating tape, with Kapton tape being highly recommended due to its properties. This method is successful because isolating the GPU from the motherboard's SMBUS does not affect the GPU's functionality or PCIe bandwidth. Users have confirmed this fix for various 50-series cards on both Z690 and Z790 Kingpin boards, preventing the need for costly motherboard replacements. However, it's not a universal solution, as some users, particularly with the 5090 FE on Z690 Classified boards, still reported issues.
There is significant user frustration directed at EVGA for its perceived lack of official support. Many users believe EVGA should provide a BIOS update to rectify the incompatibility, with some speculating that the company may lack the necessary BIOS engineering resources, especially given its current corporate status. Despite this, EVGA continues to fulfill RMAs, fulfilling legal obligations. The issue's existence was hinted at in translated Korean forums for some time, suggesting that EVGA's Asian offices may have been aware of the fix but did not widely disseminate it.
This specific incompatibility between EVGA Z690/Z790 boards and NVIDIA 50-series GPUs highlights potential design divergences in optional PCIe pin implementations. While the tape workaround offers a practical solution for many, the situation underscores the importance of strict adherence to PCIe specifications or proactive BIOS support from motherboard manufacturers to ensure broad hardware compatibility, especially with new generations of high-performance components.
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