Can i replace 1066Mhz memory with 1333? Tags: Corsair Memory Last response: February 12, 2011 12:36 AM in Memory Share nmc122 February 11, 2011 5:18:35 PM Hello, I'm looking to upgrade my MBP 15" from 4Gb to 8. I currently have 1066 MHz but looks like most stores (at least those near me) only sell 1333 MHz. Is it okay to change from 1066 to 1333? Cheers, Nathan More about : replace 1066mhz memory 1333 Ubrales a b } Memory February 11, 2011 7:57:44 PM Welcome to Tom's Hardware! Yes, you can do that as long as you don't change the DDR 2 to DDR 3 - the worst case scenario would be that the 1333 RAM would clock down to 1066. The RAM specs are determined by what motherboard you have. m 0 l Ubrales a b } Memory February 12, 2011 12:36:43 AM Clarification: If it is DDR 2 stay with DDR 2 - if it is DDR 3 stay with DDR3 - whatever the motherboard supports. Do not switch between the 2. m 0 l Can't find your answer ? Ask ! Publish Related resources Solvedmemory speed is 1066mhz, but my ram is 1333mhz Forum SolvedInstalled 1066Mhz memory that reports as 1333Mhz in "About this Mac" Forum Add another 4GB of DDR3 1066MHz or replace with 8GB 1333MHz? Forum Memory 1066Mhz shown instead of 1333Mhz on HP PC Forum WHAT IS BEST MEMORY FOR Q9550 DDR2 1066MHz 2GB OR DDR3 1333MHz 2GB? Forum Memory: 1066mhz CL 7 vs. 1333mhz CL 9 Forum SolvedDDR3 1333Mhz (Laptop) on DDR3 1066Mhz Laptop Motherboard Forum SolvedIs DDR3 4GB 1333MHZ ram compatible with FSB Speed 1066MHZ processor(Core2Duo E7400) ? Forum New 12 gb 1600 Memory replacing 1333 set up. Either shows 8gb installed and is stable or shows 12gb installed and blue screen Forum SolvedWhat is better for gaming and in general, 8GB of DDR3 running at 1066mhz or 6GB of DDR3 running at 1333mhz? Forum will 1333mhz ram work with a cpu that only suppots 1066mhz Forum SolvedCan i downclock 1333mhz ram modules into a max 1066mhz mainboard? Forum Solvedi5 w/ 6gb DDR3 1333mhz or i7 w/ 4gb DDR3 1066mhz? Forum Solved6GB of 1066Mhz or 4GB of 1333Mhz? Forum SolvedOcz Platinum PC3-10666 ram issues running at 1066mhz instead of 1333mh Forum toshiba l655 1066MHz στα 1333 MHz Forum SolvedDoes a Gigabyte G1.Sniper 5 support 1066mhz memory sticks? Forum What will be if processor's fsb is 1066Mhz but ram will be of DDR3 1333mhz which is suppoerted by motherboard without OC Forum 12GB 1066Mhz or 8GB 1333Mhz? Forum DDR3 1333mhz cl=9 vs. DDR3 1066mhz cl=7 Forum More resources Read discussions in other Memory categories Compatibility DDR2 DDR3 Dual Channel RAM Corsair G.SKILL !