RAM Slot Combinations for iMac 11,3

I have the 11,3 iMac from 2010 (27" i5). I have the default RAM, with 2GB in two slots for a total of 4GB. I have 2 more slots remaining. Can I by 2x4GB from OWC and install those in the empty slots? So I have 4 + 8 GB RAM?
P.S: I'm interested in speeding up my workflow in working with adobe Photoshop, Illustrator, and inDesign. Will 12GB RAM help in greatly improving the performance of these applications?
Thanks.

That should be fine; there were some problems with mid 2010's and I will link to a couple of the lengthy threads at the time just so you can read about it. It was one of the reasons why I decided to stick with a total of 12 GB.
As for other vendors, the only other recommended vendor is Crucial; Macs are finicky about their RAM, so don't go for any value or other discounted nameless brands.
https://discussions.apple.com/thread/2567907
https://discussions.apple.com/thread/2588800

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