G.Skill Ripjaws XMP profile??

[Brokkensteel]

so i went to the bios to set my xmp profile to use my XMP profile to run at the 1600Mhz mut when i select it it asks if i want to use the cpu settings also and recommends me to have a good cpu cooling. i dont understand what that is. does the RAM xmp profile has an overclock for the cpu too?

 

[JackNaylorPE]

Haswell memory controller is part of the CPU .... when you enable XMP profile other BIOS settings are adjusted accordingly, most notable DRAM voltage.

 

[Brokkensteel]

Haswell memory controller is part of the CPU .... when you enable XMP profile other BIOS settings are adjusted accordingly, most notable DRAM voltage.

but it asks if i want to just use the RAM profile or all. yes for all and no for just the RAM

 

[JackNaylorPE]

Your PC will perform better if you follow it's recommendations to adjust all appropriate BIOS settings accordingly. If you dont like just reset all BIOS settings to default and go back to way it was.

 

[gskill support]

Everything will be fine for DDR3-1600. For even higher speeds like DDR3-2400, CPU will get hot because more stress is on the CPU/memory controller. For this reason, it is important to have aftermarket CPU cooler to keep everything nice and cool

Some BIOS will disable power saving features on the CPU if XMP is enabled, but it should not increase CPU Frequency. Any CPU change is by the motherboard BIOS, not RAM XMP.

 

[The Original Ralph]

............

Some BIOS will disable power saving features on the CPU if XMP is enabled, but it should not increase CPU Frequency. Any CPU change is by the motherboard BIOS, not RAM XMP.

Are you certain of that? The other day, on my Asus Z97M-Plus mb, i noticed temps had dropped considerably, core voltage had dropped some, and cpu frequency was only hitting 3.79 GHz (i7-4790, with turbo boost hits 4.00) in benchmark testing in XTU, as well as bench mark scores dropping approx 90 points, and mem was showing 1333 (GSkill Ripjaws 1600) - went into UEFI BIOS and found XMP dis-abled. I enabled it, and voltages returned to normal, temps climbed to what i was used to seeing and cpu freq went back up to 4.0 GHz

 

[gskill support]

So you mean it is consistently 4.0GHz? Like I mentioned, most BIOS are designed to disable speedstep once XMP is enabled. You said the CPU was "only hitting 3.79GHz" when it should be 4.0GHz under full load, so once XMP was enabled, the system cosntantly runs at full speed, but it is not overclocked beyond 4.0GHz that the CPU is rated for..

 

[The Original Ralph]

yes, doesn't matter whether it is running 0.3% or 100% load, it's at 4.00 GHz when XMP is enabled

when it had somehow disabled, it dropped to 3.79. As it's the i7-4790 (locked, not the "K") it's normal freq is 3.60 with turbo boosting taking it to 4.00 GHz, and once in awhile will show 4.01 or even 4.02 in intel's XTU utility when benchmarking

i'm running the latest asus bios for my board, 2402, and the GSkill mem is RipjawsX - F3-12800CL10S-8GBXL, which Asus had shown as compatible mem on their qualified vendor list

note the values, lower left, in intel's xtu utility

 

[JackNaylorPE]

I have had that experience previously on ASus boards .... my current M6F doesn't do that but others have. In such instances, rather than figure out what it changes to trigger this.... I just set the RAM speed, CAS timings and DRAM voltage manually.

I'll also not that my 4770k will stay up at 3500 or more sometimes when first booted if I have AI Suite open.... but after 10 minutes or so I drop down to 800 Mhz.

 

[The Original Ralph]

........

I'll also not that my 4770k will stay up at 3500 or more sometimes when first booted if I have AI Suite open.... but after 10 minutes or so I drop down to 800 Mhz.

now that you mention it, i re-installed the AI Suite III the other day, and as before when i had it running, cpu freq would fluctuate as low as 800 when idle. But i un-installed the suite when i saw temps stay 10C hotter with it installed, whether open or not.

Without it installed, whether reading cpu freq in XTU or real temp, cpu is at 4.00 constantly, with zero fluctuation

 

[gskill support]

Advanced Mode > Advanced > CPU Configuration > CPU Power Management Configuration

=CPU Power Management Configuration=

/Enhanced Intel SpeedStep Technology/
This item allows your system to adjust the CPU's voltage and cores frequency,
resulting in decreased power consumption and heat production.

[Disabled]
The CPU runs at its default speed.

[Enabled]
The system controls the CPU speed.

Turbo Mode [Enabled]
This item allows you to automatically set the CPU cores to run faster than the base
operating frequency when it is below the operating power, current and temperature
specification limit.

CPU states [Auto]
This item allows you to set the power saving of the CPU states. Configuration options:
[Auto] [Disabled] [Enabled]

The following items appear only when you set the CPU states to [Enabled].

Enhanced C1 state [Enabled]
This item allows your CPU to reduce power consumption when the system
is in idle mode. Configuration options: [Enabled] [Disabled]

CPU C3 Report [Enabled]
This item allows you to disable or enable the CPU C3 report to the
operating system. Configuration options: [Enabled] [Disabled]

CPU C6 Report [Enabled]
This item allows you to disable or enable the CPU C6 report to the
operating system. Configuration options: [Enabled] [Disabled]

C6 Latency [Short]
This item allows you to set the duration of C6 latency for C6 state.
Configuration options: [Short] [Long]

CPU C7 Report [CPU C7s]
This item allows you to disable or enable the CPU C7 report to the
operating system. Configuration options: [Disabled] [CPU C7] [CPU C7s]

C7 Latency [Long]
This item allows you to set the duration of C7 latency for C7 state.
Configuration options: [Short] [Long]

Package C State Support [Auto]
This item allows you to set the a C-state support for the CPU package.
Configuration options: [Auto] [Enabled] [C0/C1] [C2] [C3] [C6] [CPU C7]
[CPU C7s]

Straight out of the user's manual... ASUS BIOS is designed to disable these features when XMP is enabled which is why it runs at 4.0GHz without fluctuation. You can manually change these values if you would like.