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Need help with different ram speeds

Hi ,

Guys i've got 2 questions and would greatly appreciate your opinions.

I recently added a 4 GB 1600 mhz ram to my pc which already had one 2 gb 1333 mhz stick in it. The system has detected it and everything is running fine. My question is when I run Cpu z the following info is shown in memory tab -> Dram frequency 665 mhz.

Question 1: Is the motherboard using the lower frequency i.e. 1333 mhz for both ram stick?

Now this 2nd question needs some explaining :ange:

My motherboard is Intel DH55pj which officially only supports 1033 and 1333 mhz ram. When i went to my local market i could not find any new 1333mhz ram from a reputable company so i went to the original shop i bought this pc from and asked what i could do? they told me that a 1600 mhz ram would work. I was sceptical so they said they would install it in my system. If it runs properly and i test it myself i could buy it.

They installed it and now my system detects it and working properly. i bought it and system is running fine

question 2: Why would intel not show 1600 mhz ram compatibility on their motherboard?? surely it would be an extra selling point.

your opinions would be greatly helpful. Thanks
4 answers Last reply Best Answer
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  1. Best answer
    Answer 1 - Yes

    Answer 2- it is compatible with 1600, but all RAM installed has to operate at the same speed, so when you mix different RAM speeds on your modules/sticks, the motherboard will operate RAM at the slowest speed RAM module/stick installed.

    Also, if your motherboard has a max speed of 1333, then anything speed-wise installed in it (1600, 1866, 2133) will operate at the motherboards limit, which in this case is 1333.
  2. animal said:
    Answer 1 - Yes

    Answer 2- it is compatible with 1600, but all RAM installed has to operate at the same speed, so when you mix different RAM speeds on your modules/sticks, the motherboard will operate RAM at the slowest speed RAM module/stick installed.

    Also, if your motherboard has a max speed of 1333, then anything speed-wise installed in it (1600, 1866, 2133) will operate at the motherboards limit, which in this case is 1333.


    ______________________

    +1
  3. animal said:
    Answer 1 - Yes

    Answer 2- it is compatible with 1600, but all RAM installed has to operate at the same speed, so when you mix different RAM speeds on your modules/sticks, the motherboard will operate RAM at the slowest speed RAM module/stick installed.

    Also, if your motherboard has a max speed of 1333, then anything speed-wise installed in it (1600, 1866, 2133) will operate at the motherboards limit, which in this case is 1333.


    Thank you.
  4. Happy to be able to help :)
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