Can you mix a 4gb ram stick with a 2gb ram stick?

Hi there,

I have a very nice system I have been upgrading for a little while and was looking to add some more ram. I managed to buy a Kingston DDR3 2gb stick of ram for quite cheap online. I was wondering if I can mix a 2gb ram stick with a 4gb ram sick in the same motherboard? Would it cause any problems to my system? Is it wise to have matching ram sticks of the same make and memory?

Thanks for your time,


Here is my system specifications.

Processor (CPU): AMD Bulldozer FX-4 Quad Core 4100 3.60Ghz (3.8Ghz Turbo Mode)
4 CORES Black Edition Perfect For Overclocking

Motherboard: ASUS M5A78L-M USB3 With AMD 760 Chipset
Supporting Quad & SIX Core CPUs & DDR3 Memory

Memory: One Stick of 4GB DDR3 1333Mhz PC10666

Hard Drive: 1TB SATA3 - 6Gb/s, 7200 RPM & 32MB Cache

Optical Drive: SONY 24XDVD+/-RW Lightscribe & Dual Layer

Graphics Card: ATI Sapphire 5770HD Vapor-X 1Gb

Case: COOLERMASTER Elite 330 Black Tower Case & 520W Corsair Professional Series

Connections: 8 x USB2.0 Inc 2 USB3.0, Gigabit LAN 10/100/1000 & 7.1 HD Audio
1 x PS/2 Ports, 1 x Optical S/PDIF Port

3 answers Last reply
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  1. Hi :)

    Yes as long as the same speed...

    All the best Brett :)
  2. Actually, there's more to it than that. You need to make sure the timings on the 2 sticks are the same. My RAM has 9-9-9-24 timings, so when I add more I'll need to make sure that the new RAM matches these timings.

    Even if your two sticks do have identical timings, I'm not 100% sure you'll get the full benefit of DDR RAM due to the differing capacities.
  3. it'll work to the lowest common demoninator, you may get dual channel up to the lowest limit. or stick on seperate channels to be sure. i'm running 2x1GB and 2x2GB ddr2.
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