Is mixing 2gb and 4gb RAMs of different brands harmful for PC?

First of all, I'm a noob when it comes to PC so pls forgive me ;)

I bought a customised tower from a PC shop 8 months ago and they installed me a faulty, 4gb, brand-less RAM. As a result, I encountered blue screen errors, so I returned it since it's under warranty. Since there'll be job order and indefinite processing time, I just bought another 2gb RAM of my own so I could still use my PC. BSODs are gone.

After 6 weeks, they've finally given me the replacement. I installed them together and now I'm running on 6gb and when I run the Windows Memory Diagnostics Tool, it found no memory errors.

My question is: will it be harmful to my motherboard if I will keep using these in the long run?

I've seen on some forums that some people tried to mix different sizes, brands, speed, etc of RAM and the PC wont boot normally and they encounter problems. Mine seems OK. And many of PC gurus giving advices say it is *not* recommended to mix them up, although you can mix it if one wants it. Are there any bad consequences doing such?

Anyway, I'm running Windows 8.1 Pro, 64-bit, AMD A4-4000 APU 3.0 GHz. I cannot tell my Gigabyte motherboard, sorry. It says 'To be filled by OEM' :p

Max Clock speed: 800 MHz
Max Bandwidth: PC3-12800
CAS Latency Supported: 5 6 7 8 9 10 11
Timings: 11-11-11-28

Max Clock speed: 666.67 MHz
Max Bandwidth: PC3-10600
CAS Latency Supported: 6 7 8 9
Timings: 9-9-9-24

Both of different brands.

I hope these info are enough...
3 answers Last reply
More about mixing 2gb 4gb rams brands harmful
  1. If the RAM is working ok then there should be no long term problems. I have run sets of different RAM on multiple older systems and they have been ok. If you run the memory in dual channel mode then the memory sticks need to be atleast same size and preferrably same make and model to ensure it works properly. In your case it shouldn't make a difference though as long as it works.
  2. Will it do any harm, no. Will it potentially cause instability and poor preformance, good chance.
  3. If they are working OK then they will probably continue to, there's never a guarantee that mixed DRAM will play nice and often it doesn't, but there are occasions wen it's all just fine...if any doubts about stability, can run Prime for a couple hours or so
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