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Can I use DDR3 1600MHz memory with 1600MHz compat motherboard but only 1333MHz compat processor.

Hi folks,

I have put together and ordered a motherboard, processor and memory combination to upgrade a PC to a budget Haswell Socket 1150 system.

Motherboard is a Biostar H81MG
http://www.biostar.com.tw/app/en/mb/introduction.php?S_ID=657

Processor is an Intel Pentium G3220
http://ark.intel.com/products/77773/Intel-Pentium-Processor-G3220-3M-Cache-3_00-GHz

Memory is a Komputer Bay 4G DDR3 1600 PC-12800 DIMM
http://www.amazon.co.uk/Komputerbay-1600MHz-PC3-12800-Desktop-Heatspreaders/dp/B00883DT6I

Although I had checked that memory was compatible with the motherboard and would run at 1600MHz I did NOT expect processor to (according to info on Intel's site) ... not support running at 1600Mhz (ie. run at 1333MHz).

Can anyone advise whether or not machine will work and run reliably at 1333MHz speed. Will the motherboard realize the processor will only run at 1333MHz and clock it down? OR will I be better to return the unopened processor and change it for the only slightly more expensive Intel Pentium G3420 which according to this :-

http://ark.intel.com/products/77775/Intel-Pentium-Processor-G3420-3M-Cache-3_20-GHz

... supports 1600MHz speed.

Thanks in advance for any advice.

Phil.
3 answers Last reply Best Answer
More about ddr3 1600mhz memory 1600mhz compat motherboard 1333mhz compat processor
  1. Ram is usually based on the motherboard specs. That is why you have people with i5-4670k that only support 1600mhz using 2400 RAM cause their motherboard can support it. So if your motherboard says it will support it (also check their vendor list as a safe bet tho not every stick of ram will be listed there) you should be able to run it at 1600. Most times you can downclock the ram to 1333 tho.
  2. cyberws said:
    Hi folks,

    I have put together and ordered a motherboard, processor and memory combination to upgrade a PC to a budget Haswell Socket 1150 system.

    Motherboard is a Biostar H81MG
    http://www.biostar.com.tw/app/en/mb/introduction.php?S_ID=657

    Processor is an Intel Pentium G3220
    http://ark.intel.com/products/77773/Intel-Pentium-Processor-G3220-3M-Cache-3_00-GHz

    Memory is a Komputer Bay 4G DDR3 1600 PC-12800 DIMM
    http://www.amazon.co.uk/Komputerbay-1600MHz-PC3-12800-Desktop-Heatspreaders/dp/B00883DT6I

    Although I had checked that memory was compatible with the motherboard and would run at 1600MHz I did NOT expect processor to (according to info on Intel's site) ... not support running at 1600Mhz (ie. run at 1333MHz).

    Can anyone advise whether or not machine will work and run reliably at 1333MHz speed. Will the motherboard realize the processor will only run at 1333MHz and clock it down? OR will I be better to return the unopened processor and change it for the only slightly more expensive Intel Pentium G3420 which according to this :-

    http://ark.intel.com/products/77775/Intel-Pentium-Processor-G3420-3M-Cache-3_20-GHz

    ... supports 1600MHz speed.

    Thanks in advance for any advice.

    Phil.


    All memory chips have a set of preset JEDEC specs that they can adhere. When you install new chips the BIOS will default to using one of these sets that works best with your CPU (well the highest setting that is very safe to use usually). Because of this even very fast memory modules can be installed in most boards. A bigger issue with memory and motherboards is size of the memory on the stick (memory density). Older DDR3 boards may not support memory that uses high density memory modules even of a small size as I am referring to the chips on the module not the amount of memory on the module. (This is not an issue for your board though)

    From there you can go into the BIOS and switch them to either a higher JEDEC spec or one using the manufacture's suggested specs by setting it manually or through the Intel XMP or AMD AMP memory settings if the motherboard supports using them and if the module has them.
  3. Best answer
    WHile the mobo plays in, the CPU is the bigger factor, because the MC (memory controller) is in the CPU, 1150 mobos can handle 1600 with no problem, and your CPU should be able to carry 1600 with no problem either, simply go into the BIOS and enable XMPselect 1600 profile 1...if your CPU does have any problem can add a little voltage to MC and/or DRAM and be up and running
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