XMP and overclocking

[Molesy]

Hey Guys,

 

Does XMP, OC the CPU ? I ask cause i did a build recently with a i7 6900K on a GA-X99P-SLI. So the base of 3.2GHz and turbo of 3.7GHz and 4GHz on 2 cores when using turbo boost 3.0. So after install etc just to make sure everything booted etc on stock settings i saw that all cores on the CPU would reach 3.7GHz as it was AIO cooled it appeared to give all cores the max turbo boost. which is fine and withing spec. But when i enabled XMP profile in bios to 2400MHz for the ram the CPU has gone to 4GHz on all core automatically. when stress testing all cores sitting on 4GHz stable. If i disable XMP CPU goes back to default Intel specs.

 

Is this what XMP does as a side effect of getting the ram to its designed specs ? i dont mind the auto OC a little boost is great without having to really tweak voltages etc. will the same happen on a ASUS board ?

 

Also I have a friend that wants to get a new PC and is looking at the i7 7700K  but does not want to OC but wants the higher clocks of K CPU for rendering and video encoding. So i was wondering if I enabled XMP on the board will that give him a bit of OC on the K cpu without having to tweak voltages etc. Also will this work on a H series board with the XMP OC  or will there be no difference in the clock speeds just the ram speed and timings ?

 

The last part to this question would be that if he got the 7700k with the XMP enabled assuming it will give him a slight improvement on the frequencies would a CM Hyper 212 X be enough to cool this seeing that its been used on a LGA 2011-3 CPU's that have a 140w TDP and this has only 91w in comparison.

 

 

Thanks for all the help guys.  

[TheLagDidIt]

only x and z series can you oc

[Molesy]

9 hours ago, TheLagDidIt said:

only x and z series can you oc

I see. so if i enable XMP on  H series board with the i7 7700k it will only up the memory speed but the CPU will stay at stock. but if this was on a Z series board the CPU would get a small boost ?   

[ARikozuM]

XMP overclocks only the RAM. 

 

Are you looking at the clock speed through Task Manager?

[Molesy]

11 minutes ago, ARikozuM said:

XMP overclocks only the RAM. 

 

Are you looking at the clock speed through Task Manager?

that and hw monitor. when running cinebench the score is a lot higher with xmp enabled and with it not enabled. 

[ARikozuM]

1 minute ago, Molesy said:

that and hw monitor. when running cinebench the score is a lot higher with xmp enabled and with it not enabled. 

Mind posting the screencaps? The 4.0GHz on all cores could be due to the higher bandwidth the CPU didn't have before, but I'm not privy to Turbo 3.0.

[Molesy]

1 minute ago, ARikozuM said:

Mind posting the screencaps? The 4.0GHz on all cores could be due to the higher bandwidth the CPU didn't have before, but I'm not privy to Turbo 3.0.

I will have to see if i can do that as i have already given the build to my friend since it was for him. so TB-3.0 is really just a software thing where you can tell it that if these apps are running give it priority and run the 2 cores it gets at 4Ghz. so when i did the stress testing without XMP enabled i could see that call cores would hit 3.7ghz in HW monitor. then when i enabled XMP i saw that it was then hitting 4Ghz on all cores. and the results in cinebench has about a 150-200 point difference between the two. I also saw that vcore voltage went to about 1.25 with XMP enabled. 

[-rascal-]

10 hours ago, Molesy said:

Hey Guys,

 

Does XMP, OC the CPU ? I ask cause i did a build recently with a i7 6900K on a GA-X99P-SLI. So the base of 3.2GHz and turbo of 3.7GHz and 4GHz on 2 cores when using turbo boost 3.0. So after install etc just to make sure everything booted etc on stock settings i saw that all cores on the CPU would reach 3.7GHz as it was AIO cooled it appeared to give all cores the max turbo boost. which is fine and withing spec. But when i enabled XMP profile in bios to 2400MHz for the ram the CPU has gone to 4GHz on all core automatically. when stress testing all cores sitting on 4GHz stable. If i disable XMP CPU goes back to default Intel specs.

 

Is this what XMP does as a side effect of getting the ram to its designed specs ? i dont mind the auto OC a little boost is great without having to really tweak voltages etc. will the same happen on a ASUS board ?

 

Also I have a friend that wants to get a new PC and is looking at the i7 7700K  but does not want to OC but wants the higher clocks of K CPU for rendering and video encoding. So i was wondering if I enabled XMP on the board will that give him a bit of OC on the K cpu without having to tweak voltages etc. Also will this work on a H series board with the XMP OC  or will there be no difference in the clock speeds just the ram speed and timings ?

 

The last part to this question would be that if he got the 7700k with the XMP enabled assuming it will give him a slight improvement on the frequencies would a CM Hyper 212 X be enough to cool this seeing that its been used on a LGA 2011-3 CPU's that have a 140w TDP and this has only 91w in comparison.

 

 

Thanks for all the help guys.  

 

What is your frequency does your CPU STRAP and/or BCLK becomes after you enable XMP?

 

For most motherboards and DRAM combinations, DDR4-2400 should not cause increase the BCLK from the stock 100 MHz -- but it is possible.

Usually, it is when the memory kit is 2800 MHz or higher is when that will change -- but again, that depends on how the DRAM manufacturer programed the XMP profiles.

 

For an example, with my i7-6800K and G.Skill TridentZ DDR4-3000 kit, enabling XMP will re-adjust the CPU and Cache ratio, AND bump my CPU STRAP and BLK frequency up from the stock 100 MHz to 125 MHz.

 

 

[Molesy]

2 minutes ago, -rascal- said:

 

What is your frequency does your CPU STRAP and/or BCLK becomes after you enable XMP?

 

For most motherboards and DRAM combinations, DDR4-2400 should not cause increase the BCLK from the stock 100 MHz -- but it is possible.

Usually, it is when the memory kit is 2800 MHz or higher is when that will change -- but again, that depends on how the DRAM manufacturer programed the XMP profiles.

 

For an example, with my i7-6800K and G.Skill TridentZ DDR4-3000 kit, enabling XMP will re-adjust the CPU and Cache ratio, AND bump my CPU STRAP and BLK frequency up from the stock 100 MHz to 125 MHz.

 

 

The BCLK stayed at 100. no change in that just the multiplier got bumped since its set to auto. I see so i could be that if i enabled XMP nothing will happen but just memory. for the i7-7700k looking at a 32GB 2400 kit.  but since xmp will readjust the ration will that only happen on a Z series board for this cpu ?

[-rascal-]

30 minutes ago, Molesy said:

The BCLK stayed at 100. no change in that just the multiplier got bumped since its set to auto. I see so i could be that if i enabled XMP nothing will happen but just memory. for the i7-7700k looking at a 32GB 2400 kit.  but since xmp will readjust the ration will that only happen on a Z series board for this cpu ?

 

XMP feature is only available for Z or X chipset based motherboards -- boards that support overclocking.

 

Anything beyond the Intel specification of DDR-2133 will involve overclocking the Integrated Memory Controller (IMC). That said, the IMC on the most recent generations of Intel CPUs are very robust.

 

It should not be a problem since your BCLK remained at 100 MHz. You can adjust the ratio of you think it's too high, etc.

[Molesy]

46 minutes ago, -rascal- said:

 

XMP feature is only available for Z or X chipset based motherboards -- boards that support overclocking.

 

Anything beyond the Intel specification of DDR-2133 will involve overclocking the Integrated Memory Controller (IMC). That said, the IMC on the most recent generations of Intel CPUs are very robust.

 

It should not be a problem since your BCLK remained at 100 MHz. You can adjust the ratio of you think it's too high, etc.

I see. good to know.  i shall suggest a Z series board for him so even later down the line he can OC manually if he wants. now i just need to find him a cooler. would you say the Hyper 212X would be ok for the 7700K since its TDP is 91w and the 6900K series is 140 TDP. 

[NumLock21]

For non OC board, XMP just sets the timing for the ram and run it based on the chipset's limitation of DDR4 2133MHz. On Z and X based board, when enabling XMP, CPU straps is set to 125MHz, this will OC your CPU. So some will lower their cpu multiplier to run at stock speed.

[Molesy]

1 hour ago, NumLock21 said:

For non OC board, XMP just sets the timing for the ram and run it based on the chipset's limitation of DDR4 2133MHz. On Z and X based board, when enabling XMP, CPU straps is set to 125MHz, this will OC your CPU. So some will lower their cpu multiplier to run at stock speed.

I see. does running the BCLK at 125 cause any issue like stability etc? I know back when i had the Q6600 and changing the BCLK to get a OC you had to make sure the PCIE frequency was set to 100 manually  as changing the BCLK also affected this frequency. else it could cause a issue as the slot was not designed to run higher than the 100 default. 

[NumLock21]

7 minutes ago, Molesy said:

I see. does running the BCLK at 125 cause any issue like stability etc? I know back when i had the Q6600 and changing the BCLK to get a OC you had to make sure the PCIE frequency was set to 100 manually  as changing the BCLK also affected this frequency. else it could cause a issue as the slot was not designed to run higher than the 100 default. 

That depends on your board, majority of them can handle it, although it's best to run it at 100MHz.

http://www.gskill.us/forum/showthread.php?t=13427

[Molesy]

1 hour ago, NumLock21 said:

That depends on your board, majority of them can handle it, although it's best to run it at 100MHz.

http://www.gskill.us/forum/showthread.php?t=13427

I see. awesome thanks. I think on my X99 system it would put the BCLK to 125 but with the new BIOS it stays at 100.  so now the only question that remains is the Cooler. since he does not want to do manual overclocking at the moment would the CM Hyper 212X be good for both the i7-7700K or the i7-6800/6850K with just the XMP OC. what would be the a good cooler to keep the CPU cool seeing as no real OC atm which it will allow him to upgrade to a better cooler like a AIO etc in the future to really OC.

[-rascal-]

8 minutes ago, Molesy said:

I see. awesome thanks. I think on my X99 system it would put the BCLK to 125 but with the new BIOS it stays at 100.  so now the only question that remains is the Cooler. since he does not want to do manual overclocking at the moment would the CM Hyper 212X be good for both the i7-7700K or the i7-6800/6850K with just the XMP OC. what would be the a good cooler to keep the CPU cool seeing as no real OC atm which it will allow him to upgrade to a better cooler like a AIO etc in the future to really OC.

 

The Cooler Master Hyper 212 X (successor to the Hyper 212 EVO) should be okay for either CPU's at stock, or with a mild overclock (with moderate voltage increases). Just enabling XMP for the DRAM usually doesn't create much more heat -- if any at all.

 

I am currently using a Hyper 212 EVO with my i7-6800K for the time being, and it is holding fine up with a moderate 4.125 GHz overclock using ~1.32V.

The chip has seen upper 70*C temperatures so far (IMO getting closer to the warm side for my taste), but that it is.

(It is a temporary cooler until EKwb starts shipping their second-generation Predator coolers in Q2 2017).

[Molesy]

34 minutes ago, -rascal- said:

 

The Cooler Master Hyper 212 X (successor to the Hyper 212 EVO) should be okay for either CPU's at stock, or with a mild overclock (with moderate voltage increases). Just enabling XMP for the DRAM usually doesn't create much more heat -- if any at all.

 

I am currently using a Hyper 212 EVO with my i7-6800K for the time being, and it is holding fine up with a moderate 4.125 GHz overclock using ~1.32V.

The chip has seen upper 70*C temperatures so far (IMO getting closer to the warm side for my taste), but that it is.

(It is a temporary cooler until EKwb starts shipping their second-generation Predator coolers in Q2 2017).

Oh that's good to hear. so since i wont really be doing any OC the temps should sit well. what are your ambient temp when you saw those cpu temps? we have had some crazy hot days here in SYD 40+ *c here so really gets hot. 

 

so my CPU cooler options were:

1.DeepCool Gammaxx S40  for $35  Since its rated for 130 Watts TDP i was thinking that it would work well for the 7700K with a mild OC / XMP  dont think it will work well on the LGA 2011-3 CPUS

2. Cooler Master Hyper 212X $55

3. Deepcool Frostwin V2 $59

4. Noctua NH-L9x65 $79

[NumLock21]

7 hours ago, Molesy said:

I see. awesome thanks. I think on my X99 system it would put the BCLK to 125 but with the new BIOS it stays at 100.  so now the only question that remains is the Cooler. since he does not want to do manual overclocking at the moment would the CM Hyper 212X be good for both the i7-7700K or the i7-6800/6850K with just the XMP OC. what would be the a good cooler to keep the CPU cool seeing as no real OC atm which it will allow him to upgrade to a better cooler like a AIO etc in the future to really OC.

New bios will still set it to 125. They will not change the way the board behaves, until everyone starts talking about it.

212 series are decent coolers, of course there are much better one like noctua. Aio are good, but air cooler is less maintenance. I think bitwit did a review on the 212x and difference between that and 212 evo is 1degrees. 

 

Here is my oc with a 212 evo 

 

Here is that thread

 

 

[Molesy]

Sorry for the late reply guys. Thanks for all the help very informative ! I shall let my friend know so he can decided what route he would like to go with his build.