Seasonic Focus Plus PSUs have compatiblity issues with some GPU

Seasonic posted a notice on its website that in select cases, users may encounter compatibility issues with the FOCUS Plus power supplies when the unit is used in conjunction with certain high-power consumption GPUs.

The issues occur with the ASUS GeForce GTX 970 STRIX as well as AMD Radeon Vega 56/64 cards made before January 2018. With the former, users may see black screens when the GPU is heavily stressed. This is caused by a higher than normal ripple emitted by the video card, and can be resolved by using modified PCIe cables with enhanced shielding.

The Radeon Vega 56 and 64 users can in rare cases suffer from system shutdown on PCs with the Focus Plus PSU. Seasonic thinks is is caused by a higher than normal peak current emitted by these GPUs, which triggers the PSU's internal protection safety.

We have been notified, in limited instances, where some issues may occur when a FOCUS power supply is used in conjunction with certain high power consumption GPU or brand of VGA cards. If you experience possible compatibility issues, please check the below information and contact us for further assistance:

FOCUS PLUS & ASUS GTX970 STRIX: In very limited instances black screen may occur under heavy VGA usage. Current testing showed that certain VGA cards may emit higher than normal ripple when under heavy load and using a modified PCIe cables with enhanced shielding resolved the issue.

FOCUS PLUS & Vega 56/64: For units with serial numbers before January 2018, in rare instances, possible system shutdown may occur when GPU is under heavy load. This is possibly caused by higher than normal peak current emitted by this particular range of GPU's when under heavy load triggering the PSU’s internal protection safety.

H/T: TPU