XFX RX 580 8GB 1505Mhz stable

Jul 30, 2018
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I've been steadily working up my overclock on my RX 580, but it's to the point where I'm hitting 1505mhz on the core with memory clocked at 2250Mhz and it still seems stable. I've left Unigine Valley Benchmark running for 2 hours now at high detail and 1920x1080 resolution with this overclock and it was still running fine when I came back just now to check. My max temps during the benchmark never exceeds 70* and my fan curve doesn't even set itself to 100% until 75*.

After reading other peoples overclocks on 580s I was expecting to max around 1480Mhz.

Is there any other ways I should use to verify that I am indeed still stable? My current method is to set my overclock on the card with MSI Afterburner and then run Unigine Valley for at least 30mins each time I adjust it. It just seems strange that it'd still be stable at 1505Mhz.