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XMP profile on CMX6GX3M3A2000C9


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Hi i'm haveing some problems with the CMX6GX3M3A2000C9 DRam and the XMP profile.


I can run this ram at 2004 speed no problem yet soon as I enable XMP in the bios, the system will not run.

It will black out after post screen just after the windows logo loads, also I noticed the ram speed is increased by 004.0 hmz when I enable XMP.

I have set every setting manual and it still failed when XMP enabled. but with these its stable below.

I have all the settings on defaults except the following ones listed below.



Cpu Clock :- 23

BClk Ferq:- 167

PciE Freq:- 100

Performance Enhance :- Turbo

DRam Timing Selectable (SPD) :-12 (2004mhz)


Cas Latency Time :- 9

tRCD :- 9

tRP :- 9

tRAS :- 24

tRC :- 51

tRRD :- Auto (but XMP sets this to 8. The highest I can get set it manually is 7)

Command Rate(CMD) 2


Cpu Vcore :- 1.32500

DRam Voltage :- 1.66

Load Line Calibration :- Lvl 1


HPET Mode :- 64-bit mode



1 - Why won't the PC run with the XMP profile enabled?

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FWIW- XMP is not guaranteed and it's not always the best settings for specific hardware. It's a "best guess" at what will work on most PCs. You may need to manually work the BIOS options to see how fast your PC hardware will run reliably as each system is different and only guaranteed to run at the official CPU/RAM speeds. The i7-950 officially supports 1066 MHz. RAM speed. Even though the RAM has been tested and confirmed to run stable @ 2000 MHz. the CPU may not be happy at that frequency or with XMP enabled. Overclocking is a journey of exploration, not a destiny. ;):




Quote from Intel XMP website:


"Δ Warning: Altering clock frequency and/or voltage may: (i) reduce system stability and useful life of the system, processor and other system components; (ii) cause the processor and other system components to fail; (iii) cause reductions in system performance; (iv) cause additional heat or other damage; and (v) affect system data integrity. Intel has not tested, and does not warranty, the operation of the processor beyond its specifications. Intel has not tested, and does not warranty, the operation of other system components beyond their industry standard specifications. Intel assumes no responsibility that the processor and other system components, including if used with altered clock frequencies and/or voltages, will be fit for any particular purpose."



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I can run this ram at 2004 speed no problem yet soon as I enable XMP in the bios, the system will not run.
Why enable XMP if it's stable without it?


as i said in the post i have set all settings manual inc the qpi vtt yet still the same soon as xmp enabled system hangs. Yet i have not set the QPI/VTT over 1.36volts in my tests. is it safe to have as high as that think 1.40 was tops?


1.40v is tops on Gulftown. You are running a Bloomfield CPU.

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I was lead thinking it was a booster or is XM3 just a bios setting to self set the system?


What I don't get is why I can set the setting manual, that XMS would set yet when enabled it will not boot. I do everything the same as the XMS profile set's yet i get 004.0 ghz more speed from somewhere with XMS enabled. infact I am running the system higher than the XMS profile would set and am stable, run prime95 no errors. so why XMS failing?

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:( I've got the xms profile working but have lowered the dram multi too 12, So am running at 1600. i have set the ram timeings t2. Everything else is on auto in bios. The system seems stable from what can tell run prime for 4hr.

Everything I have tryed to increase from here seems to of failed!! so were would u say i start?


Cpu-Z says my CPU VTT is 0.980V up and down, Dram is at the default 1.65. not sure of a program that could tell me my QPI/Vtt in Win 7 yet when i look its set for 1.2 in bios under the profile.


I can overclock the CPU and keep ram low i get no problems. yet useing defaults now.


Thanks :)

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