![]() Right now my replacement drive is under load, and at 46 C, with the fan running at 2700rpm, controlled by Macs Fan Control. You have to lower your standards as to what is good enough. Dust accumulated over 10 years might have played a role. Increasing circulation only moves that hot air from one place inside the housing to another. The inside was just a huge swirl of hot air. ![]() Maxing out the fan didn't lower temperatures that much. When we have enough data points we can plot a graph. ![]() It is called 'platform controller hub die' in Macs Fan Control if I understand correctly. I would like to ask everyone to post your resistor value and your temperature reading. It would not have made a difference anyway. Apparently, Apple didn't think additional cooling was required at 59 degrees C! The guys who simply shorted out the wires were not wrong. (It might not have been a linear curve, but I've heard 51k ohm=1500rpm and 100k ohm=max.) As a data point, Macs Fan Control reads 59 degrees Celsius and rpm is at its lowest, 1100, if left at "Auto" to be controlled by the system. PWM?), but just in case, I put in a 16K resistor. I am not sure if the temperature is denoted by some resistance value (or e.g. It doesn't appear to be the way to go anymore after so many years. So, I decided not to worry about connecting that temperature cable to the replacement drive. Back in those days Apple was known to have ordered custom firmware and/or hardware so the original drives might be different even if they appeared to be the same. Even if a drive does have that small connector it doesn't mean it gives temperature output. Many newer drives don't even have that small connector for connecting the temperature sensor to the motherboard. With everything re-installed I was truly amazed at the renewed performance of the iMac running OS Sierra.Īdded more RAM memory for a total of 12Gb, and also enabled trim support on the Samsung SSD, and installed SSD Fan Control, although with an SSD everything runs so cool that SSD Fan control is probably an overkill.Ī great way to give these excellent iMacs a new lease of life! This one's a keeper for at least another 3 years, by which time I will probably have upgraded to High Sierra or even Catalina with the DosDude patch.Īfter replacing the drive of my Mid-2010, I conclude that software control is the way to go. Glad I did this because when removed there was a great deal of clogged dust particles remaining in the housings which required a good cleaning too. Whilst doing this it was obvious that the fans would benefit from removal and thorough cleaning. So I installed a Samsung 860EVO SSD in place of the original HD. I'd been planning to sell my mid 2010 27" iMac and purchase the new 2019 model, as the performance had significantly dropped off despite doing an OS clean install. Simply shorted out the HD connector with a home-made jumper wire as shown HERE. Just do what many have successfully done, myself included. Don't waste your money on that OWC (or similar) temp sensor!
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