intel i7 vdimm topics collection

http://www.augustinefou.com/search?q=vdimm

vdimm - voltage of the RAM memory modules, usually tweaked by overclockers to achieve higher speed and performance

i7 - the brand name of the new Intel microprocessors. The microarchitecture of this new generation of processors has the memory controller built into the processor. 

the "Core i7 vdimm issue" talks about the fact that the voltage of the RAM modules cannot (and should not) be tweaked independently of the CPU voltage (vcore). Otherwise if the vdimm is raised too high and the RAM is "fried" the CPU will be "fried" too. This was not the case in previous microarchitectures because the memory controller was NOT built into the CPU itself. 

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+vdimm +i7

DFI LP JR X58-T3H6 MicroATX Board Details - Intel , Motherboards ... The BIOS features CMOS Reloaded, Voltage Tuning for vDIMM, vNB, vCore, vSB, vHT, frequency tuning in increments of 1 MHz, adjustable CPU multiplier, and ABS technology system. The board features as many as 7 fan headers, onboard power ... PCHardwareBlips - Top PC Hardware... - http://pchardwareblips.dailyradar.com/

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1.65v max +vdimm +i7

Core i7 Vdimm/VTT Graveyard :D - XtremeSystems Forums Nov 16, 2008 ... So, i7 launched and we are all sufficiently scared of using more than 1.65v vdimmalright. Looking at the real world performance boost from ...

Source: http://www.xtremesystems.org/forums/showthread.php?p=3439099

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Core i7 vdimm - gaming performance

Corsair Core i7 Gaming Performance Analysis 6GB vs 3GB By eva2000  Memory - Manually configured to 1600MHz at 8-8-8-24 timings, 1T command rate, 1.65v VDIMM; QPI Frequency - Manually configured to 6400MHz; BClock Frequency - Manually configured to 133MHz; CPU Turbo Mode, C1E, EIST, SpeedStep - Disabled ... i4memory.com - http://i4memory.com/wp/

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How Core i7 works on the inside: +vdimm +i7

How Core i7 works on the inside Does high Vdimm kill Core i7? Some say yes, some say no... for those of you who remember amd going IMC some years back, you might remember that the 90nm ...

Source: http://forum.msi.com.tw/index.php?topic=121604.msg918308

Does high Vdimm kill Core i7?

Some say yes, some say no...

for those of you who remember amd going IMC some years back, you might remember that the 90nm shrink brought some problems with it... high vdimm could kill or degrade the integrated memory controller. well how did we work around that back then? vcore had to be increased as well to keep the vcore vdimm ratio more or less the same and things were fine. Later when amd moved to K10, the same thing happened again with some imcs dieing at 1.9v ddr2 vdimm if vcore and other related voltages were kept low.
well for amds imc implementation the memory controller was actually powered by vcore, so thats most likely why the vcore vdimm ratio had to be maintained. for nehalem or core i7 the memory controller is powered by vtt...

Intel recommends a max vdimm of 1.65v, which is curiously 1.5x vtt...
Several people reported that running higher than default vtt plus higher than 1.65v vdimm works just fine. how come?
From what i know about manufacturing processes, you have to pick the target voltage you want to work with at some point, and then decide what transistor design to use. some transistors can take high voltages but switch slow and are rather beefy, others are small and can switch much faster but will degrade with higher voltages. which is exactly what people reported with vdimm damaged core i7 cpus. one way to work around this and stress the transistors less is by not grounding them to ground but to some other voltage.

I dont know why or how, but vdimm is definately related to vtt, and the fact that intel recommends a max vdimm of 1.5x vtt is not a coincidence if you ask me... its not clear whether this 1.5x ratio exists and if it has to be maintained, or if vdimm has to be within a certain voltage range to vtt, but in either case the resulting highest vdimm/vtt ratios are about the same... once we have relatively cheap 920 cpus available and people can risk burning a cpus im sure it will only be a matter of weeks until we know more about vdimm/vtt on core i7

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+vdimm +i7

anyone following the vdimm i7 issue? Nehalem News - The latest news on Intel's next generation microarchitecture.

Core i7 - Is High VDimm really a Problem? (AnandTech)-bet365-happy ... Numerous articles and forum posts have been popping up recently about the potential of high VDi ...,i bet you will be happy 365 days here.

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Anandtech Lab Notes - Core i7 920 OC with Patriot Memory DDR3

Anandtech Lab Notes - Core i7 920 OC with Patriot Memory DDR3 By eva2000 Keeping VCore, VDimm, and VQPI in proper sync is the key to a stable overclock at voltages that will not shorten your processor's lifespan, well not by that much from what we can tell at this point. Intel's guidance continues to be not ... i4memory.com - http://i4memory.com/wp/

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+vdimm +i7 DDR3 memory

Lab Notes - Core i7 920 OC with Patriot Memory DDR3 By hardwarehome Our settings consisted of 1.3975V VCore, 1.64V VDimm, and the secret sauce setting of QPI voltage at 1.3750V. Our FSX settings were run at Ultra High with AA/AF/DX10 enabled in order to stress the CPU and GPU during the benchmark ... Hardwarehomes Blog - http://hardwarehome.wordpress.com/

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Google Alert - +vdimm +i7

anyone following the vdimm i7 issue? Nehalem News - The latest news on Intel's next generation microarchitecture.

[AnandTech] Core i7: Is High vDimm really a problem? - techPowerUp ... Really interesting article over at AnandTech for those of you interest in the whole VDimm malarkey with the upcoming Core i7 CPUs and DDR3 voltages. ...

Elite Bastards • View topic - Intel Core i7 - Is high VDimm really ... For now, high VDimm is not necessarily the true problem here, but it is the quickest way to damage/destroy an i7 if the system is not properly tuned. ...

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Core i7 vdimm problem, aka "Is High VDimm really a Problem?"

the answer is below. 

Source:

http://www.nehalemnews.com/2008/07/rumor-sli-on-nehalem-whats-latest.html

Source:

http://www.anandtech.com/memory/showdoc.aspx?i=3426

"Intel's stance is clear on this subject, run VDimm higher than their 1.50V~1.65V guidelines and you will affect the life span of the processor." "We have already witnessed several CPUs being damaged or destroyed at the motherboard partners with high VDimm settings, especially those that ran at 2.0V or higher with base settings."

"this platform offers simply amazing bandwidth and latency numbers with tri-channel DDR3 1066 or DDR3 1333. In fact, we think tri-channel DDR3-1333 at 5-5-5-12 timings or DDR3-1500~DDR3-1600 6-6-5-15 settings (1.65V) will provide optimal memory bandwidth, write speeds, and latencies for 95% of the users at this point.  So, unlike the P45/X38/X48 platforms, having low-speed rated DDR3 is not going to be a hindrance to extracting fantastic performance from a i7/X58 setup."

Source:

http://www.tomshardware.com/news/intel-i7nehalem-memory-voltage,6464.html

Overvolted RAM May Kill Your Core i7 CPU

4:20 PM - October 8, 2008 by Aaron Heibert Source: Tom's Hardware – Category : Motherboards

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Memory controllers built into the upcoming Core i7 processors could change the way some enthusiasts push their systems beyond spec.

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