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Question on memory matching (dual vs single channel)

post #1 of 3
Thread Starter 
I'm running an ASUS M4A79XTD EVO with 4GB (2x2) of DDR3 RAM. I'd like to upgrade to 8 GB of RAM and was going to get another set of the same 2x2. However, my processor heat sink and fan is blocking one of my two remaining RAM slots. So, I have 3 options:

Buy a 1x4GB stick and run 1x4+2x2
Replace my current 2x2GB with 2x4GB
Reorient my heat sink fan (which will mess up my air flow) to accomodate 4x2GB.

Option 1 is the cheapest and least wasteful, but I seem to recall that RAM works best in matching pairs? Will it be ok to run a 4GB stick that is different than my existing pair of 2GB sticks? This PC is used for lots of gaming, but I usually don't overclock anything, if that matters.
post #2 of 3
If you throw in a 4gb stick to accompany your 2x2gb it will run the 4GB stick in single channel. As cheap as RAM is there's really no reason not to just pick up a 2x4gb kit unless you are REALLY strapped for cash.

EDIT: beers is right, the 2x2gb will do dual but the 4GB will be single channel. My mistake. However, I still say get 2x4gb as cheap sadden is.
Edited by estabya - 1/12/13 at 10:34am
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Pieced Together
(12 items)
 
Macbook Pro 13"
(6 items)
 
 
CPUMotherboardGraphicsRAM
i3 2120 EVGA Z77 FTW EVGA GTX 760 SC ACX PNY 2x4Gb 1866 CL10 
Hard DriveCoolingOSMonitor
OWC Mercury Electra 240Gb CM Hyper TX3 Windows 10 LG 34UM95 
KeyboardPowerCaseMouse
Apple Keyboard Seasonic 430W Rosewill Challenger Logitech G302 
CPUGraphicsRAMHard Drive
i5 4278U Iris 5100 8Gb DDR3 256Gb PCIe SSD 
OSOS
El Capitan Windows 10 
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post #3 of 3
As long as you balance capacities per channel you'll get the best performance.

If they are mismatched, you'll still get small gains by interleaving.

1x4 + 2x2 will run fine in dual.
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Overclock.net › Forums › Components › Memory › Question on memory matching (dual vs single channel)