iMac memory increase

[wallofsound]

I've got a late 2009 27" iMac and want to put some more memory in it. Currently got 2x2gb sticks.

Firstly, will this fit? http://http://www.overclockers.co.uk/showproduct.php?prodid=MY-032-OK&groupid=701&catid=8&subcat=1264

If so, am I okay to get 2 4gb sticks to run with the current 2x2gb ones?

Thanks a lot.

 

[wallofsound]

Anyone able to help?

 

[wallofsound]

Thanks both! Will order after pay day.