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RAM change - PC won't start

Tags:
  • RAM
  • Dual Channel
  • MSI
  • Memory
Last response: in Memory
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October 11, 2014 12:11:41 AM

Hello,
In my PC, there is the default RAM for MSI build I bought 3 years ago. It's 4,00GB Dual-Channel DDR3 @ 665MHz and the motherboard is MSI PH67S-C43 (MS-7673) (SOCKET 0).

Now I got a new RAM - KHX1600C9D3B1/4G @ 1600MHz

Notice that these two different RAMs have different DRAM frequency

First I tried to place my new RAM beside others. When I tried to turn on my PC, all fans were running and LEDs were shining for ~1 second. Then everything stopped for ~0.5 second. Then my PC started itself and again stopped. It was an infinite loop.

Then I took the new RAM out and my PC started as normally.

So I decided to try it again, but now only the new RAM. So I took the old RAMs out and placed the new RAM in. Then I started to run my PC and the same thing happened.

So I placed my old RAMs in again and took the new one out. But now the infinite loop started again! So I tried to swap the dual-channel RAMs and the PC started normally.

I think, there is something locked in UEFI or in mobo, so I can't change RAMs, but I don't know what exactly.

Thanks for answers.

More about : ram change start

a b } Memory
October 11, 2014 12:41:23 AM

First of all, it's not recommended to use modules with different frequencies. It's best to use all matched pairs per channel or at the very least, use all modules with the same specs. That being said, your motherboard does not support 1600mhz RAM which is what your new RAM is. It's not going to work with that RAM.
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a b } Memory
October 11, 2014 12:55:43 AM

To add, not sure why you singled out your original memory frequency as 665MHz before mentioning 1600, maybe thinking theres a huge difference?. DDR3 (as well as DDR2) is double data rate so 665x2 equates to 1333MHz or near enough. Is not much difference at all vs 1600MHz

You might have seen in a diagnostics tool showing your memory as 665MHz which all programs like that account for single data rate only. 1600Mhz ram is 800Mhz single data rate and 1600MHz double data.
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