October 2010 27" iMac-What memory do I need/want?

[Imola Ghost]

How do I find out?

 

[tyche]

Check out the Apple knowledge article http://support.apple.com/kb/ht4255

What I did was search eBay for my imac model and there were a number of vendors selling the memory at a good price.

 

[Imola Ghost]

Thanks, this is what I got and I keep getting a BEEP at the beginning. Will these not work?

http://www.compusa.com/applications/SearchTools/item-details.asp?EdpNo=7101495&CatId=4153

 

[Imola Ghost]

I was wrong my 27" iMac is from October 2009.

I could have swore it was a 2010 model but I did get this when the 27" models first came out and I thought it was 2010 when they originally came out.