Will 2400Mhz RAM work in my mobo if it only supports 2133Mhz RAM?

[PATENT]

I have H110M mobo from gigabyte and I was wondering if I put in it 2400Mhz RAM will it work but at lower speed (2133) or it won't work?

[Omega]

It will work but it will run at 2133mhz.

[oobymach]

It depends on the ram, some are geared for 2 speeds only, in the case of 2400 it could support either 2400 or 1333 for example but nothing in between, some are geared for multiple speeds but you may have to configure them in bios to run at the speed you want.

Best bet is to get 2133mhz ram as it will take less monkeying around in bios to run it at full speed (you may still have to monkey around in bios to get it to run at maximum speed as in the above example it may boot at 1333 until you change it in bios).

[Omega]

oobymach の投稿を引用：

It depends on the ram, some are geared for 2 speeds only, in the case of 2400 it could support either 2400 or 1333 for example but nothing in between, some are geared for multiple speeds but you may have to configure them in bios to run at the speed you want.

Best bet is to get 2133mhz ram as it will take less monkeying around in bios to run it at full speed (you may still have to monkey around in bios to get it to run at maximum speed as in the above example it may boot at 1333 until you change it in bios).

1333? This is DDR4 not DDR3.

[Dr.Shadowds 🐉]

Patent の投稿を引用：

I have H110M mobo from gigabyte and I was wondering if I put in it 2400Mhz RAM will it work but at lower speed (2133) or it won't work?

No point buying 2400Mhz, since it's going to downclock it to what it can support only. If you're asking should you buy RAM that's above 2133Mhz, because it's cheaper, then that would make a lot more sense with this discussion, as you might as well grab the cheaper one.

[oobymach]

Omega の投稿を引用：

oobymach の投稿を引用：

It depends on the ram, some are geared for 2 speeds only, in the case of 2400 it could support either 2400 or 1333 for example but nothing in between, some are geared for multiple speeds but you may have to configure them in bios to run at the speed you want.

Best bet is to get 2133mhz ram as it will take less monkeying around in bios to run it at full speed (you may still have to monkey around in bios to get it to run at maximum speed as in the above example it may boot at 1333 until you change it in bios).

1333? This is DDR4 not DDR3.

Doesn't matter, same rules still apply, not sure what the default speed for ddr4 is so I used ddr3 as an example.

[Omega]

oobymach の投稿を引用：

Omega の投稿を引用：

1333? This is DDR4 not DDR3.

Doesn't matter, same rules still apply, not sure what the default speed for ddr4 is so I used ddr3 as an example.

2133mhz is the default DDR4 speed.

[tacoshy]

oobymach の投稿を引用：

Omega の投稿を引用：

1333? This is DDR4 not DDR3.

Doesn't matter, same rules still apply, not sure what the default speed for ddr4 is so I used ddr3 as an example.

DDR4 RAM only exist as 2133MHz... every higher frequency is overclocked...

so short all DDR4 RAM run at 2133MHz


Edit: Same applies to DDR3

[Blaagh]

.. on intel

[tacoshy]

Mario (Super) Mario の投稿を引用：

.. on intel

not only on Intel because Intel doesnt specify RAM, JEDEC does. Just that Intel KabyLake supports 2400MHz CPU wise and for Ryzen and Coffee Lake 2666MHz is supported CPU wise. Everything higher needs to be supported MoBo wise. However even 2400MHz and 2666MHz is overclocked RAM (DDR4-2133). This is sold as RAM with XMP/AMP profile to auto overclock it when XMP/AMP enabled.
Therefor as every RAM with no expetion is 2133MHz it will run on every MoBo and CPU that required/supports DDR4.

[SenMithrarin85]

can overclocking ram cause issues? i have only turned on the xmp profile to boost the 2133mhz ram to 2400.

[Omega]

SenMithrarin85 の投稿を引用：

can overclocking ram cause issues? i have only turned on the xmp profile to boost the 2133mhz ram to 2400.

XMP is a automatic overclock (kinda). The RAM itself has a XMP profile and the mobo is able to use that profile to overclock the memory to the correct settings. It's mainly for user friendliness, so even a dumbo can get his RAM to run at the correct speeds. Sadly most people don't even know of the existance of XMP and will run their super expensive 3200mhz RAM at 2133mhz causing system instability in some cases.

If you manually overclock your RAM and overclock it to high you can get blue screens, system freezes or the PC might not even POST.

[tacoshy]

yes it can like every OC

tho RAM manufcaturers (well the brands as the major manufacturer is Samsung...) test them on stability and sell them into different categories because Silicon Lottery applies here too.

For example G.Skill Trident Z DDR4-3200 is sold at CL14 (14-14-14-34) CL15 (15-15-15-35/36) and CL16 (16-18-18-38/39). That is because they test the RAm and thanks to silicon lottery some arent stable at lower timings while others are.

Long story short: If RAM was sold as DDR4-2400 then the manufacturer garuntees to run at those specs but in the end that doesnt mean it sint possible that the where wrong / RAM is faulty.


PS: For Ryzen it is a little different as they mostly doesnt run stable with XMP profiles above 2666MHz and need to be manually OC'ed with higher latency or "down-OC'ed"

[SenMithrarin85]

tacoshy の投稿を引用：

yes it can like every OC

tho RAM manufcaturers (well the brands as the major manufacturer is Samsung...) test them on stability and sell them into different categories because Silicon Lottery applies here too.

For example G.Skill Trident Z DDR4-3200 is sold at CL14 (14-14-14-34) CL15 (15-15-15-35/36) and CL16 (16-18-18-38/39). That is because they test the RAm and thanks to silicon lottery some arent stable at lower timings while others are.

Long story short: If RAM was sold as DDR4-2400 then the manufacturer garuntees to run at those specs but in the end that doesnt mean it sint possible that the where wrong / RAM is faulty.


PS: For Ryzen it is a little different as they mostly doesnt run stable with XMP profiles above 2666MHz and need to be manually OC'ed with higher latency or "down-OC'ed"

so should i disable the oc and run the ram at stock? sorry to hijack, op!

[tacoshy]

If you have troubles with the RAM with PC freezes or BSOD's then try this. IF everything works fine then dont bother.

[PATENT]

Dr.Shadowds 🐉 の投稿を引用：

Patent の投稿を引用：

I have H110M mobo from gigabyte and I was wondering if I put in it 2400Mhz RAM will it work but at lower speed (2133) or it won't work?

No point buying 2400Mhz, since it's going to downclock it to what it can support only. If you're asking should you buy RAM that's above 2133Mhz, because it's cheaper, then that would make a lot more sense with this discussion, as you might as well grab the cheaper one.

Im going to buy 2666Mhz and Im swapping my h110m mobo for z270 that's why Im asking