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2 GB RAM is the minimum required for OS X 10.8 (Mountain Lion) to the latest, OS X 10.11, however at least 4 GB RAM tends to be advised, especially if you are using more demanding apps.

I have the base model early 2009 Mini, which came with just 1 GB RAM, and Leopard installed. I upgraded to Snow Leopard when it came out a few months later. I added another 4 GB RAM 3 years ago when I upgraded to Mountain Lion. It still has the original 120 GB HDD, plus a 1 TB external HDD for Time Machine, as well as a 500 GB external for extra storage.

All though the early 2009 Mini will run more recent iterations of OS X, I have not bothered installing them. For one, until recently my internet service was very slow and unreliable. For another, many of the features of more recent OS X are only available to more recent hardware. Mountain Lion will do me, until I get another Mac Mini in a couple or three years time.
 
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It is pretty easy to upgrade RAM in your MM.
The hardest part IMHO is disconnecting the clips for the antennas (it takes some force).

Will take 30 minutes if you take your time.
visit ifixit guide
 
Like others have said it's a bad idea to install latest OS X without more RAM. 2 Gb is plenty for Snow Leopard but 10. 8 Mountain Lion and later will work slowly with so little RAM. If you want 10.8 or later OS 4 Gb is practically minimum amount, anything less is likely to result in spinning wheel and slowdown.

I wouldn't call installing RAM into Early 2009 easy, sure its possible but compared to later models its more complicated.
 
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Like others have said it's a bad idea to install latest OS X without more RAM. 2 Gb is plenty for Snow Leopard but 10. 8 Mountain Lion and later will work slowly with so little RAM. If you want 10.8 or later OS 4 Gb is practically minimum amount, anything less is likely to result in spinning wheel and slowdown.

I wouldn't call installing RAM into Early 2009 easy, sure its possible but compared to later models its more complicated.

Open top case
Remove antennas
Remove four screws
Disconnect one cable
Remove the top frame
Remove ram
Install ram
....
 
Open top case
Remove antennas
Remove four screws
Disconnect one cable
Remove the top frame
Remove ram
Install ram
....

It seems we have different idea what "easy" means.

Compare to 2012 Mini:

Remove cover.
Remove RAM.
Instal RAM.
Replace cover.

No change of breaking antennas or cables...
 
Windows 10 on a Mac Mini 2006

I installed yesterday Windows 10 32 Bit on a Mac Mini CoreDuo 1.66 GHz with 2 GB RAM.

Workaround:
- Use Boot Camp assistant from OS X 10.6.8 for a new Windows partition
- Install Windows 7 32 Bit (burn an ISO-image from MS on a DVD)
- Install all necessary Boot Camp 4.x 32 Bit hardware drivers manually (the Boot Camp 4 Installer won't work on a Mac Mini 2006)
- Activate Windows 7
- Upgrade to Windows 10 using the MS Upgrade assistant (the upgrade took 9 hours on the Mac Mini 2006)
- In Windows 10 go to Device Manager -> Select 'Graphics card' -> There is only a basic MS driver installed. Right-Click -> Update Driver software -> Mobile Intel 945 Express Chipset will be installed

Enjoy.

Update: Workaround for Apple HFS support: https://forums.macrumors.com/thread...-pro-from-nonactivated.1984874/#post-23170924
 
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I've been inside my 2009 mini probably half a dozen times to add memory and replace the hard drive a couple times. It takes a while, but it's really not that bad.
 
2009 are. Wet east to open up. You will need a putty knife from your local hardware store.

I have several 2009s I've upgraded. 2011 I bought was already upgraded with SSD (that was my requirement) as I'm scared to open those.
 
Windows 10 on a Mac Mini 2006

I installed yesterday Windows 10 32 Bit on a Mac Mini CoreDuo 1.66 GHz with 2 GB RAM.

Workaround:
- Use Boot Camp assistant from OS X 10.6.8 for a new Windows partition
- Install Windows 7 32 Bit (burn an ISO-image from MS on a DVD)
- Install all necessary Boot Camp 4.x 32 Bit hardware drivers manually (the Boot Camp 4 Installer won't work on a Mac Mini 2006)
- Activate Windows 7
- Upgrade to Windows 10 using the MS Upgrade assistant (the upgrade took 9 hours on the Mac Mini 2006)
- In Windows 10 go to Device Manager -> Select 'Graphics card' -> There is only a basic MS driver installed. Right-Click -> Update Driver software -> Mobile Intel 945 Express Chipset will be installed

Enjoy.

Update: Workaround for Apple HFS support: https://forums.macrumors.com/thread...-pro-from-nonactivated.1984874/#post-23170924

Hello where can I find the drivers for this system to install windows on it?

I have the same system I got in a garage sell.
 
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