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Two Dual Channel Compability

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Hi,

I currently have Asus P8P67 Pro MB with memory below

CORSAIR XMS3 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model TW3X4G1333C9A G
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

and I want to add these RAM

CORSAIR XMS 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMX4GX3M2B1600C9
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

The only difference is frequency (1333 and 1600 MHz)


If I put them together, will the second dual channel run at the first dual channel or the dual channels run independently?

If the 1600 will be downgraded to 1333, is it safe to OC the 1333 to 1600 first, then add the 1600?

Thanks!!

More about : dual channel compability

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Memory Authority

When you mix and match the RAMs you'll get an intermediate speed.
When you OC the RAM it's going to go upward equally on all the Slots, it's a gap that you can never close.
Suggestion, especially since it's an Asus board, sell the 1333's and get another pair of 1600s.
Memory Expert

Hi, yes It'll be better to get 2 pairs of these instaed CORSAIR XMS 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 and sell the 1333's like alyoshka said. Overclocking with 1333' and 1600's mixed will cause stability issues, and ddr3 1600's are the sweet spot for the sandy bridge platform :) 

Thanks for the input. If that is the case, do you guys recommend to get
4x2gb
or
2x4gb and having the other 2 slots open so I can upgrade later with another RAM when I need it?
This case will probably cause the same issue as I have now though, lol.

I am currently using the rig for daily activities and light gaming.. I just have too many tabs opened in Chrome and I need more RAM to compensate that..

2x4gb seems to be the cheaper option as well..

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Memory Authority

Well, 2 X 4GB sticks would be a better option anyday since it allows for further upgrades, and no, I don't think you'll have the same problem that you're having now with the timings when you go in for another upgrade later 'cos these RAMs...4GB single slots isn't something a lot of people buy, it's not as common as the 2GB sticks. Thus the availability of the same model of the 4GB stick RAM is going to be the same even after a year..... most probably.
Memory Expert

Get 2x4gb some motherboards don't play nice when all dimm sockets are populated. for example if you have 4x2gb 1600 modules your motherboard might automatically down clock the 1600's to run at 1333 speed. And it's better for overclocking as well.

Thanks for the reply all.
I guess I am going to buy 2x4 GB first (1.5V !! 1600 Mhz and CAS 9 at least) , stick it inside my rig with 2x2gb and then sell my 2x2gb...
Hopefully it is not hard to sell it on CL..


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