RAM upgrade, iMac 2010

First, could you post the Apple site that is telling you to upgrade the RAM to 6-8 GB.

If you want to upgrade your RAM, I would add another 4 GB for a total of 8 GB. Buy a 4 GB Kit. (2- 2 GB modules/dimms).

A good place to get it OWC Be sure to get the right RAM for your Model iMac.

The support article also states this "You can use RAM module sizes of 2 GB or 4 GB in each slot"

Apple recommends using 2GB or 4GB modules in each slot. Be careful using the 1GB module. You can certainly try it, but be prepared to remove it if your System starts acting unusual.

You'll notice general System instability that can happen right away or slowly over time: freezes, spinning ball, applications unexpectedly quiting, updates not completing, etc. If you notice any of those things happening, use the Apple Hardware Test CD that came with the computer, if you have one, to check the RAM. Or, just remove the RAM module you installed and see if the problems go away. Good luck.

Glad to help, and thank you!