Curious about RAM frequency

[shiroyuki03]

i have this scenario and would like to clarify. i bought RAM speed of 2666mhz. motherboard can support up to 3200mhz. cpu RAM speed at 2133mhz. so i buy 2666mhz RAM, it will downclock to 2133mhz. its being reflected in the task manager of win 10.

then what is the point of getting super high speed RAM when its going to be downclock? or am i wrong here?

 

[hlots123]

go into ur uefi bios to enable xmp, or manual enter ram speed & timings

 

[shiroyuki03]

go into ur uefi bios to enable xmp, or manual enter ram speed & timings

its alr selected at xmp profile. and even change the speed in the bios to match the actual speed of the ram. but still, it reflects in task manager that it is still running at 2133mhz. referring to this link, as you can see, the memory speed supported is up to 2133mhz. so does it make any sense to get a 2666mhz ram?

 

[hlots123]

oic
the intel link for 6700k also shows jus the officially supported non-oc speed 2133, but we kno it can go higher

but i dunno why win10 task mgr only shows 2133 for u

 

[hlots123]

if u set 2666 in uefi, save & reboot back into uefi - does it show memory running at 2666...?

 

[LLCSG12]

Did u place ur ram sticks at correct slot as indicated in mobo manual?

 

[Crooni]

use cpuz

official jedec ddr4 standard is 1066 mhz. anything above is oc. motherboard supports oc speed by providing adequate power/voltage and electrical connections for bandwidth.

all also subject to bios and ram chip. some combinations don't play well with win10, so it reports the default 1066.

check the board memory qvl to see which brand/stick/chip will play nice at what frequency. those are tested and validated.

interestingly the reverse can also happen with older ddr4-1600. win10 can't read the chip, so it reports 1066mhz/2133 while it's actually running at 800mhz/1600.

 

[shiroyuki03]

if u set 2666 in uefi, save & reboot back into uefi - does it show memory running at 2666...?

yup. it does show me at the speed i selected.

 

[shiroyuki03]

oic
the intel link for 6700k also shows jus the officially supported non-oc speed 2133, but we kno it can go higher

but i dunno why win10 task mgr only shows 2133 for u

does yours appear to be 2133 too or your ram speed setting?

 

[shiroyuki03]

Did u place ur ram sticks at correct slot as indicated in mobo manual?

yup. placed in the right slots.

 

[shiroyuki03]

use cpuz

official jedec ddr4 standard is 1066 mhz. anything above is oc. motherboard supports oc speed by providing adequate power/voltage and electrical connections for bandwidth.

all also subject to bios and ram chip. some combinations don't play well with win10, so it reports the default 1066.

check the board memory qvl to see which brand/stick/chip will play nice at what frequency. those are tested and validated.

interestingly the reverse can also happen with older ddr4-1600. win10 can't read the chip, so it reports 1066mhz/2133 while it's actually running at 800mhz/1600.

ohh thats an interesting fact. will check with cpuz when i reached home.

 

[hlots123]

does yours appear to be 2133 too or your ram speed setting?

mine shows oc'd ram speeds in win10 task mgr & at uefi right side bar (asus too)

 

[hlots123]

yup. it does show me at the speed i selected.

then more likely ur already at 2666
hav to investigate more in windows - cud be wat Crooni mentioned...

 

[larrytok8888]

i have this scenario and would like to clarify. i bought RAM speed of 2666mhz. motherboard can support up to 3200mhz. cpu RAM speed at 2133mhz. so i buy 2666mhz RAM, it will downclock to 2133mhz. its being reflected in the task manager of win 10.

then what is the point of getting super high speed RAM when its going to be downclock? or am i wrong here?

better bandwidth when u run at higher speeds of ram if not wrong..

in the past OC clocks was linked to FSB (front side bus), which was linked to ur ram speed. so it really mattered, i believe now its more to bandwidth.

Some people also buy faster speed rams so that they can run better latency at lower clk speeds.

e.g. 3200 rated at 16-16-18-38

u can run it at 2133 at prob 15 15 15 - X (most latency are lower).

instead of buying a value ram which is 2133 at 16 16 16 - X (example)

This also talks about the bandwidth
http://www.anandtech.com/show/8959/...to-3200-with-gskill-corsair-adata-and-crucial

 

[ikkozilla]

When you exit bios, did you select save and exit properly? Last time i oc 'd ram, i spent 2 hours figurig that out. LOL.

Sent from Samsung SM-G900F using GAGT

 

[shiroyuki03]

When you exit bios, did you select save and exit properly? Last time i oc 'd ram, i spent 2 hours figurig that out. LOL.

Sent from Samsung SM-G900F using GAGT

yea i did save and exit. and come in to check one more time.

 

[shiroyuki03]

then more likely ur already at 2666
hav to investigate more in windows - cud be wat Crooni mentioned...

apparently i oc again till 3000mhz. and saved. but in windows and cpuz it does not reflect. cpuz reflect 2133 (1600). and i read the motherboard memory qvl. seems like only max 2133mhz. specs on the right. -->

 

[shiroyuki03]

better bandwidth when u run at higher speeds of ram if not wrong..

in the past OC clocks was linked to FSB (front side bus), which was linked to ur ram speed. so it really mattered, i believe now its more to bandwidth.

Some people also buy faster speed rams so that they can run better latency at lower clk speeds.

e.g. 3200 rated at 16-16-18-38

u can run it at 2133 at prob 15 15 15 - X (most latency are lower).

instead of buying a value ram which is 2133 at 16 16 16 - X (example)

This also talks about the bandwidth
http://www.anandtech.com/show/8959/...to-3200-with-gskill-corsair-adata-and-crucial

ohh thanks for your input. but theres a vid online showing marginal improvement. by linus techtip. 1600 vs 2400 i think.

 

[hlots123]

put ur ram at stock in uefi, then go windows run some mem benchmarks
then enable xmp settings or manual ram oc in uefi, then run same benchmarks compare any improvmts...

 

[hlots123]

apparently i oc again till 3000mhz. and saved. but in windows and cpuz it does not reflect. cpuz reflect 2133 (1600). and i read the motherboard memory qvl. seems like only max 2133mhz. specs on the right. -->

but i see ur mb qvl goes up to 3333mhz...