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Old Oct 28th, 2015, 08:57 PM   #1
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Upgrading to SSHD for 27" iMac Late 2009

Hello,

I've added an SSD to my own 24" iMac Early 2009, and now am helping a friend to upgrade her 27" iMac Late 2009.

I think we've landed on purchasing a hybrid drive (l , I think, unless there's a compatibility issue; any thoughts?

Aside from a SATA connection, can I install either a 2.5" or 3.5" one of these in the computer? If so, would either need a temperature sensor? (Referencing the most helpful answer here, it appears the 2.5" doesn't, at the very least?)

Also, are there any brand-related compatibility issues for SSHDs, as there appear to be with the HDs (see here)?

As always, thanks for any insight, Ladies and Gentlemen.
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Old Nov 3rd, 2015, 08:13 PM   #2
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In general, a 3.5 in drive will outperform a 2.5 in drive just because of geometry. The larger platter passes more data under the heads with each revolution.

It's not a matter of whether the Drive needs a temp sensor, its what the iMac expects to see on its temperature sensor inputs.
The 2009 imac expects to see temperature information on two leads from a cable from specific pins on the hard drive.
New model hard drives might not have the pins for the cable, and SSDs and 2.5 in drives definitely won't, and if you switch brands the existing temp sensor will not work.

If you are using a repplacement 3.5 in hard drive, you should stay with the same brand, as the temperature sensor cables are specific to the brand of drive. Otherwise, OWC sells a SATA cable solution for providing the proper signal to the sensor leads from any drive, or you can go with a software solution called HDDFanControl. If you go with a third party temp sensor solution, there aren't any brand issues with the hard drive.

Installing hard drives in an Apple iMac | CanadaRAM: Memory and Computer Q&A
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Old Nov 4th, 2015, 06:45 PM   #3
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Thanks for the reply. If they were to max out RAM for this model (not being able to boot it up, I don't know how much is in there now, in what I am assuming is 2 slots, and they haven't opened the bottom to see), how much RAM would that involve?
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Old Nov 6th, 2015, 08:25 PM   #4
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Quote:
Originally Posted by josheejs View Post
Thanks for the reply. If they were to max out RAM for this model (not being able to boot it up, I don't know how much is in there now, in what I am assuming is 2 slots, and they haven't opened the bottom to see), how much RAM would that involve?
The nominal maximum is 8 GB with 2 x 4 GB 1066 MHz modules. You can pull out the modules (easy to do, trap door under the ;chin; of the machine) and read what they have.

iMac Late 2009 only with OSX10.7.5 and latest EFI Firmware - iMac10,1 and iMac11,1 only can go to 16 GB with 2 x 8 GB. We carry the 8 GB 1066 modules for this, they are a bit spendy.
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Old Nov 26th, 2015, 06:47 PM   #5
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Thanks for the response.

I'm just about to swap drives, but can't recall. Will I need a boot drive or can I just connect to the internet and download an OS that way?
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Old Dec 1st, 2015, 06:30 PM   #6
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How did you make out with the SSD swap out in your friend's 2009 iMac? I have the same machine and I upgraded to a SSD a year ago. I went the OWC route and bought the SSD and enclosure adapter (it replaces the DVD drive). So now I have a HD for the data and the SSD has the OS installed on it. It's MUCH faster now.

Oh, and FYI... there are 4 ram slots, not 2. I'm running 4x4gb ram. I'm almost certain you could put 4x8gb as well to max it out.
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