So I am looking to upgrade my RAM, currently i have a 15" MBP with 2.33 GHz Intel Core 2 Duo, 2 gb, 667 MHz DDR2 SDRAM.
I'm looking to double up my ram, and have been looking at http://www.macmemory.com/macbook.asp?gclid=CKyqr5GBwJsCFQ_yDAodXBx_Aw
I need to use the silver bezel ram upgrade, but do not know which route would be better to go. Is my laptop able to use a 2x module or just the single. I'm looking to purchase the 4 gb and would like to use the 2x mod because it is far cheaper but after looking around do not know if the 2x mod would work.
Any help as to if the 2x would work, and if that is the route to go, or do i have to splurge and go for the single. Also which works better would be amazing too

Thank you in advance to all comments
I'm looking to double up my ram, and have been looking at http://www.macmemory.com/macbook.asp?gclid=CKyqr5GBwJsCFQ_yDAodXBx_Aw
I need to use the silver bezel ram upgrade, but do not know which route would be better to go. Is my laptop able to use a 2x module or just the single. I'm looking to purchase the 4 gb and would like to use the 2x mod because it is far cheaper but after looking around do not know if the 2x mod would work.
Any help as to if the 2x would work, and if that is the route to go, or do i have to splurge and go for the single. Also which works better would be amazing too
Thank you in advance to all comments