Haswell is intel, not AMD. Just discussed the issue with an OCLP developer who wrote that AMD GPUs are free of the intel Ivy Bridge and Haswell issues. Your iMac confirms that fact.Yep, Sonoma on the internal Apple SSD blade (left over from the original Fusion drive, and Ventura 13.6.3 on an external Crucial 512GB MX500 SDD. Using OCLP 1.2.1 release version on the internal SSD. iMac 15,1 i5 from late 2014, Haswell CPU 3.5GHz, AMD R9 M290X 2GB GPU.
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