How well does OSX Yosemite run on a Mid 2007 iMac?

I'm also curious about this! Has anyone done it yet on a 2007 iMac who can comment on the performance?

I own a mid 2007 imac 20' 2.4ghz 350hd and recent upgraded my Ram from 2gb to 6gb before upgrading it to OS X Yosemite, and let me tell you it all is working awesome!! Very Fast!! and with no problems....I would suggest to upgrade your Ram before upgrading to OS X Yosemite, here is link where you could buy them from http://eshop.macsales.com/shop/apple/memory/iMac/Intel_Core_2_Duo

I'm running Yosemite on late 2007 MBP (4 GB Ram), and it's far faster then Maverick!

Sorry, I didn't notice it's about iMac 2007 and no MBP 🙂

Hi JRos23. Thanks for sharing your experience.

I also have a mid 2007 iMac (2.4 GHz Intel Core 2 Duo) and I'm waiting on reviews like yours to evaluate if it is worth to take the leap and update. Last year I updated to Mavericks from Lion (skipped Mountain Lion) and it improved a lot on many fronts. However, it only felt smooth when I updated the RAM to 6GB. Apple specs tells us that this machine supports max 4Gb, though I found many people saying that it would support 1x2GB + 1x4Gb, and it does. I trully recommend it. If it helps anyone, I bought these: link (sorry, Spanish Amazon store).

However, seeing that you're having a good enough experience until now I will definitely consider it as near future project, maybe with 10.10.1. Is it really an improvement or are there any daily usage setbacks?

Cheers,

JP

I upgraded to Yosemite from Mavericks added 6 GB of memory. This mid 2007 Imac operates just like new. Fast.

my 2007 MBP is running exceptionally slow... trying to find a remedy

Just run EtreCheck and post the results please, so that we can try to help!

It will work even better with 8G. You should have bought 2 of those! It will work with it.

Leopardus-

You are the first person I know of that says the Mid 2007 iMac will take 8GB of RAM. What modules (brand, etc.) did you go with and what were your results?

OWC (MacSales.com) states that it is upgradable to 6GB.

http://eshop.macsales.com/shop/apple/memory/iMac/Intel_Core_2_Duo

Thoughts?

The

used in some iMacs can address 8GB. Look at the specsheet from Intel. Although on many iMacs and MBP's it is only indicated, maybe nor updated at the time, that they could only use 4GB maximum. Thus, if the Core Duo is a 'Penryn' processor, it can address 8GB. It is not Apple who determines what the processor can address directly, it is the processor architecture, in this case Intel's architecture of the 'Penryn' processor which, if I recall correctly, at the time was the 24nm die. It was famous for generating a lot of heat, but was (and still is), a very good processor at the time.

Hope that helps.

Leo

Leo-

Thanks so much for the additional information. I took what you gave me and dug a bit deeper and came up with this lovely memory chart:

http://www.everymac.com/systems/apple/imac/imac-aluminum-faq/imac-intel-aluminum -how-to-upgrade-memory.html

Since I have an iMac 7.1 it looks like I'm stuck at 6 GB or RAM. I believe that the iMac 9.1 models are the first you could go to 8 GB. If I'm correct, these must be the ones that use the Penryn' processor.

Hopefully this bit of information will help anyone in the future who wants to upgrade their old reliable.

Thanks again!

I have an imac 7.1 (mid2007) I have 4gb Ram, still using the original hdd - and its running SMOOTH! better than my friends macbook thats for sure, i suppose some apps take a little longer to load, but i would say that boils down to the 320GB 7200rpm hard drive, but its not really that slow, it actually runs faster than Mavericks, i have been using Yosemite for about 5 months now, have had no problems at all! I'm really suprised!

I also, have an iMac 7,1. I read where it would only support 4GB of ram. So I upgraded to 4G then installed Yosemite. Just upgraded OS to 10.10.4. No problems. Isn't real speedy but the performance, I believe, is better than it was under Maverick. I'm now looking to upgrade RAM to 6GB. Looks like several folks have without problems. We'll see.

I upgraded a 2008 iMac to 4GB and installedYosemite. It's workable running Painter and a Wacom tablet but throwing another task on top of that would not be recommended. I have a 5 year old dual xeon with lots of RAM and Yosemite doesn't so much as hiccup with Blender, Photoshop and 3rd party rendering engines all running.