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Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7, ID iMac11,3

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Mac slower after upgrading from i5 to i7!

Hey guys,

I’m baffled with this upgrade I did last week.

Upgraded my iMac 27in mid-2010 from i5 to i7 and also replaced original HD with a 2.5in 1TB HD (already installed a 500GB SSD as startup disk prior). I now experience some strange speed problems, when the fan kicks in my mouse freeze for a few seconds and then as the fans slow down I can move my mouse again, this happens very often since the upgrade and its like an advance warning when the fans turn on I expect to have my mouse frozen. Not only that but the mac itself seems to have this slowness everywhere, loading apps or running them.

All the upgrades were followed using iFixit guides.

3 reasons I can think of:

  1. CPU (tripled checked I bought the correct one, wouldn’t work otherwise)
  2. Thermal paste Artic MX-4 (could this cause this much problems?)
  3. Removal of the original HD which had temperature sensor that kept the fans normal, I now use SSD fan control.

Please help, not sure what I did wrong here, it’s driving me mad.

Regards.

Update (12/14/2020)

Update on this issue. I took @danj ‘s advice and separate the two drives apart, start-up SSD stayed where the original drive was and attached to the heat sensor (this was the reason for the loud fans turning on and off). Second drive moved to where optical drive was and as a test I unplugged the optical drive sensor and that drove the fan mad, plugged it back in and attached to the second drive for heat sensor and now everything works perfectly.

So keep those sensor plugged in and attached to the correct places.

Beantwoord! Bekijk het antwoord Dit probleem heb ik ook

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What is the exact CPU and its specs you put in?

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Intel Core I7-870 2.9GHz/ 8MB Socket LGA 1156

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Did you install the needed thermal sensor?

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No, it has 6 pins for the 3.5 HD not the 2.5 HD. I researched online and no one has problems with speed or mouse freeze at all even before installing SSD fan control app so I personally don't think that's the issue.

@danj oh wait, you said thermal sensor not heat sensor, yes I did reconnect it after taken out old CPU and double checked twice before I put the board back in the mac

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Thermal sensor VS Heat sensor that are the same!

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Well, the good news is you did get the correct CPU. At this point we need to see if the onboard diagnostics runs. I’m suspecting it will not pass an error.

If that happens we’ll need to look deeper using this great app TG Pro it will allow you to see clearly what’s happening with the thermal sensors and fans’s. We also need to look at Activity Monitor to see if kernel_task is running hard.

It’s possible the CPU you put in is defective as you likely got a used unit. Inaddition over doing the thermal paste could also effect things as the paste needs to stay on the metal heat spreader not onto the base as the small SMT devices can be effected by the paste conductivity or its capacitance.

Update (11/09/2020)

This series needs a physical thermal sensor! You can’t cheat. Please install the sensor OWC In-line Digital Thermal Sensor for iMac Late 2009 - Mid 2010 Hard Drive Upgrade

You really can’t over-ride SMC via software to replace the missing sensor. These software solutions only go so far.

The best way to think this is you are playing poker with someone which the deck has four aces, you have two more aces up your sleeve so what happens when the other player places their cards down and they have two aces and one of the aces you put down you took out of your sleeve is the same ace! Who won?? Basically, the missing sensor is seen before the software loads to over-ride it so SMC latches in a failed state which the software over-ride can’t over come.

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Already did onboard diagnostics AHT, twice.

Came back with error for heat sensor 4SNS/1/40000000: TH00-9.000 which I have managed using SSD fans control.

I got TG Pro now, do I monitor this and Activity Monitor when gets slow and freezes or just as it is now?

It could be the CPU like you said but how will I know?

Also thermal paste spread, I have been watching a few youtube videos regarding the correct amount and I guess I got about the right amount. The only way to know is open it up again which is a lot of work.

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@danj So I need this Thermal sensor for hard drive upgrade, from the two drives I have in the imac now one is SSD which has 3 pins port but the 2.5in HD doesn't have any pins. How will this cable connect?

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Lets backup here ... You have two drive ports: A SATA port which can support either a 2.5" or 3.5" HDD or SSD and a spare SATA port besides the Optical drive SATA port which can only support a 2.5" drive placed under the optical drive, following this guide Installing iMac Intel 27" EMC 2390 Dual HDD or SSD Drive

From what you described you took out the HDD and put in a SSD following this guide: iMac Intel 27" EMC 2390 Hard Drive Replacement and if you had gotten this kit: iMac Intel 21.5" and 27" (Late 2009-Mid 2010) SSD Upgrade Kit you would have gotten the required thermal sensor. Thats not to say you need this kit, merely you need the sensor! The SATA connector is what this sensor connects to.

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I did not get the kit with the sensor, I had most of the tools only needed the SSD, cant afford a £36 cable right now but I will have to sort this out, maybe check my thermal paste is its spread too much?

Also, unlike the dual HDD guide, what I did was having a mount instead of the old HD and mounted both the SSD and the 2.5" HD in that area due to the fact that the fan can get at both the drives then I can keep the CD drive.

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@midge218 - Over doing the thermal paste is a common error people make. You need to clean all of the paste around the SMD components on the CPU. Any paste wedged around the components will mess up the chips function as most paste is conductive or have capacitance. So its very important to fully clean any paste off.

Re-read the dual drive guide. We are not replacing the optical drive for the SSD! The placement is to leverage the free space and the iMac's cooling.

Placing the SSD under the HDD will not allow the HDD enough cooling. Please remount the SSD in the correct location.

FYI - Apple designed the system with this spot in mind as the placement of the SSD. In fact some models have mounting studs for the drive.

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