The speed comparisons are between normal clock and overclock (1300/2000), which proved almost completely stable. The performance gain achieved is about 20%, which is incredible, as that puts you in Radeon Pro 580 alley (3.8 GHz and 4.2 i7 models).
Performance gains with overclock are astonishing, albeit with more noise and occasional instability. (That still doesn’t mean you can’t fry your card.) Luckily both the card and the drivers have built-in stupidity protection, so they will stop the card if it get into dangerous zones. Rising voltage to max allowed enabled to me to run some test at 1400 MHz GPU clock, but the card crashed a lot. You can get higher, but you won’t be able to stay there, and there is a good chance that you will fry something. Increasing voltage or power limits doesn’t do much, because overclocks aren’t stable. Default clock for this card is 1069 / 1695.
On my iMac 2017 3.5 with Radeon Pro 575, I achieved a stable 1300 MHz GPU clock and 2000 Memory clock. That won’t be too noisy, and will cool down the card better. You will have to set the Macs Fan Control to custom to GPU DIODE, and set fan to cycle between 55-95✬.You can also increase or decrease voltage, and Graphic Card power limits ( but don't do that).After a restart you can set your Memory And GPU clock speed as you wish.In Afterburner, you need to tick “Extend official overclocking limits”.You need to download and install both the Fan Control and MSI Afterburner.You need to install custom drivers on your BootCamp Windows installation.How to overclock Radeon Pro GPUs on 2017 iMac computers? MSI Afterburner is a graphic card overclocking tool, and Macs Fan Control is an app to control the fan speed of your Mac. Performance difference between Apple BootCamp drivers, and these reworked ones is significant. You will also need three programs to overclock your card:Ĭustom drivers are based on the latest AMD Radeon drivers, meaning they have the latest optimizations and fixes built into them. You need to have Windows installed on your iMac. It should be noted that: OVERCLOCKING CAN FRY YOUR COMPUTER. Below you can read how I did it, what I achieved, metrics and some other stuff. Out of scientific curiosity, I tried (and succeeded) overclocking the Radeon Pro 575 on my iMac 2017 2.5 GHz 27”.
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