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Can I run 1333MHZ DDR3 Ram on one slot and 1600 MHZ Ram on another slot simultaneously

Tags:
  • DDR3
  • RAM
  • ADATA
  • Memory
Last response: in Memory
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June 5, 2014 5:03:45 AM

I already have ADATA 2GB DDR3 RAM(1600MHZ). Now I would like to buy a 4GB DDR3 RAM (1333MHZ) and it's second hand. Is there any problem if I try to run both simultaneously.

More about : run 1333mhz ddr3 ram slot 1600 mhz ram slot simultaneously

a b } Memory
June 5, 2014 5:34:22 AM

It might work, but it probably won't; I advise against it.
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June 5, 2014 5:38:56 AM

It will be a pain to get both to work together.

Usually, you need to get all your timings to match between both sticks, and then the faster stick will drop down to the slower stick's speed.

RAM isn't expensive right now so you are better off removing the old RAM and buying a matched kit of 2 sticks.
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a b } Memory
June 5, 2014 7:15:50 AM

if it works, it will run as with the slowest one, so 1333
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August 9, 2014 4:15:46 AM

Hello,

it might even be slower than the lowest Speed.
There are many timing dependencies in the DRAM Spec (e. g. CL at different clock speeds) , but the spec has ensured that there is one Setting which needs to be supported by all DRAMs.
And I think to remember, that this worst case setting was a DDR3-800 setting.
Even I think htis is quiet unlikely it is possible that the system will drop down to this speed.
It is quite complex for the controller to find the smallest common supported speed setting, and so if a controller vendor does not spend this effort he might just implement this lowest speedgrad that should run always.

Hermann

BTW: I have seen that there is still very often a missusage of MHz vs. Mb/s. MHZ is a frequency, Mb/s is a datarate.
Due to the double datarate nature of the DRAMs the transferrate number is double the Frequency number. So for a DDR3-1600 the transferrate is 1600Mb/s while the maximum Frequency on the data lanes (and the Clock Frequnecy) is 800MHz.
This lead to a lot of confusion in the beginning of DDR
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