21.5" mid 2010 iMac RAM upgrade.

Technaphobe1

macrumors newbie
Original poster
Nov 7, 2015
3
0
Macclesfield, U.K.
I am hoping to upgrade the RAM on my 21.5" mid 2010 iMac which is currently running on 4gb's but has a capacity to take up to 16Gb's. I was told that Crucial are the best people to purchase from and have been onto their website to have a look. I can buy either 4 or 8Gb's in packs of 2. My iMac has 4 slots to take the memory and my question is, should I purchase a double pack of 8Gb's which will mean that 2 slots on my iMac will be left empty or do I need to fill all 4 slots using 4Gb memory things/cards? Simply put, will my machines performance/health be affected by leaving 2 slots empty? Any advice greatly welcomed. Thanks
 

DeltaMac

macrumors G3
Jul 30, 2003
9,526
2,299
Delaware
The choice is yours.
You _already_ have two slots empty - your Mac shipped that way.

If you look at the Crucial web page that lists compatible upgrades for your iMac, you will see that no 8GB x 2 kits are listed, only 2GB x 2, or 4GB x 2, (or singles). No combinations with 8GB sticks listed.
As far as I can find out, the slots in your iMac won't recognize 8GB sticks.
If you want 16GB, then purchase 2 4GB x 2 kits. You won't have any empty slots then.
 

Technaphobe1

macrumors newbie
Original poster
Nov 7, 2015
3
0
Macclesfield, U.K.
The choice is yours.
You _already_ have two slots empty - your Mac shipped that way.

If you look at the Crucial web page that lists compatible upgrades for your iMac, you will see that no 8GB x 2 kits are listed, only 2GB x 2, or 4GB x 2, (or singles). No combinations with 8GB sticks listed.
As far as I can find out, the slots in your iMac won't recognize 8GB sticks.
If you want 16GB, then purchase 2 4GB x 2 kits. You won't have any empty slots then.
Oh yes your right, I completely misread it on the website! Thanks so much, I will go for the 2 4GB X 2.