Core i7 Vdimm/VTT Graveyard :D

[darthvedor]

Hi all,

Any reports if this Elpida kits are dieing to?

A DATA Triple channel 2133X "ELPIDA"

Thanks

[Astri]

Hi all,

Any reports if this Elpida kits are dieing to?

A DATA Triple channel 2133X "ELPIDA"

Thanks

Check the other graveyard

[darthvedor]

Check the other graveyard

Thanks

[EQUANT]

Hi guys!

I have an i7 920 D0 (3908A419 batch)
GA-EX58-Extreme
6Gb 1866 Mushkin 998687 (Elpida chips)

I am running it at 4.2 Ghz HT on (200x21)
memory@ 2000 mhz
Vcore = 1.4 (1.376 in windows)
VTT = 1.575 !!! (would not be stable with less!)
VDIMM = 1.68V (8-9-8-24)
PLL = 1.9V
... and i pretty much increased all other voltages by 0.22V
Clock skew is 150ps

Is 1.575V for VTT too high for 24/7 usage? I run it on air with Prolimatech Megahalems. Max temp is 65*C under full load.
I see most users can run 4.2 Ghz with much much less VTT voltage than me. What the hell is wrong with my cpu? I guess the latest D0 batches aren't that great overclockers ...

[Splave]

nope looks good

[EQUANT]

I would like to OC it even further, let's say 4.4 Ghz (210x21). How far do you think i could safely go with the VTT voltage for 24/7 use?

[Chicken Patty]

I would like to OC it even further, let's say 4.4 Ghz (210x21). How far do you think i could safely go with the VTT voltage for 24/7 use?

I wouldn't think much higher. But you can try in small increments. Sometimes the amount of voltage needed on a certain component is not worth the extra MHz.

[DavyBoy]

I run it on air with Prolimatech Megahalems. Max temp is 65*C under full load.

What are you using to monitor temps?

If you are using RealTemp have you set the TjMax to 100c?

Those temps look wrong to me, everyone else I know with the Megahalems are getting temps in the mid 70's and they are only running their chips at 4GHz..

I think your TjMax is only set to 90c hence these low temps...

With those voltages I would imagine you were pushing closer to mid 80's with the Megahalems.. like I said though, it depends on what you are using to monitor temps, when I checked my temps with EasyTune6 it said that I was idling at 26c, but RealTemp shows that I am idling at 39c...

[EQUANT]

@BLunTSmoKeR - i use EasyTune6 to monitor temperature (other temp monitoring show much higher temps). The temp with reading with ET6 i think is accurate. If i set a low temp warning in BIOS, when it will start beeping the temp in ET6 = temp limit set in BIOS, while RealTemp shows a much higher temp before the system even starts beeping.

[infected_]

im using my gskill tridents with qpiv @ 1.63v on my p6t and 920 d0

is it safe to use for 24/7? using noctua nh-u12p in push pull with another nf-p12 and mx2.

thanks,

infected_

[radaja]

@BLunTSmoKeR - i use EasyTune6 to monitor temperature (other temp monitoring show much higher temps). The temp with reading with ET6 i think is accurate. If i set a low temp warning in BIOS, when it will start beeping the temp in ET6 = temp limit set in BIOS, while RealTemp shows a much higher temp before the system even starts beeping.

in ET6 on my UD3P/R p45 board the temps are no where near accurate.you need to use realtemp for accurate temps.et6 is like a 10c less in my experience.you might be killing your cpu.be careful

[infected_]

im using my gskill tridents with qpiv @ 1.63v on my p6t and 920 d0

is it safe to use for 24/7? using noctua nh-u12p in push pull with another nf-p12 and mx2.

thanks,

infected_

Anyone?

[EQUANT]

@infected_ - just out of curiosity - what is your CPU's FPO/BATCH and what's the speed that your memory is running? BCLK=?

[infected_]

@infected_ - just out of curiosity - what is your CPU's FPO/BATCH and what's the speed that your memory is running? BCLK=?

batch #3851A220
200*21
vcore: 1.33v ht off | 1.35v ht on
qpiv/dram: 1600mhz = 1.34v | 2000mhz = 1.63v

is it dangerous to run qpiv at 1.63v for 24/7? most of the time its on idle or browsing. some games at night.

thanks,

infected_

[EQUANT]

No one can tell for sure. I keep it 24/7 at 1.575V qpi/vtt, 2000mhz memory@1.68V VDIMM. If it dies ... the hell with it, i will RMA it
1.63V is the lowest stable voltage you can get? What is your RAM voltage?

[AceBaran]

I hope someone can help me out

Got my modules replaced.. these are alot better.
I disabled HT and am running it at 20x200 @ 1.30 volts
QPI @ 1.6
Vdimm @ 1.68

Now i want to run my uncore higher then 20x.. to do this do I only need to raise my qpi volts from 1.60 to higher? or must i also raise vdimm?

These are my stats

[DavyBoy]

@BLunTSmoKeR - i use EasyTune6 to monitor temperature (other temp monitoring show much higher temps). The temp with reading with ET6 i think is accurate. If i set a low temp warning in BIOS, when it will start beeping the temp in ET6 = temp limit set in BIOS, while RealTemp shows a much higher temp before the system even starts beeping.

ET6 is really inaccurate, the temps it reports are the temps of the socket iirc, and not the CPU's core temps.

RealTemp is what you should use for temp monitoring, or CoreTemp as well.

I am currently trying to get my chip stable at 4.2GHz under air, I can get it stable with LinX (20 passes using all available RAM), with my Vcore set to 1.3375v, (1.312v in CPUZ when idle, and 1.291v under load) and uncore set to 1.355v, but when I try running Prime95 Blend Test overnight, when I come to check it in the morning I have a message on my screen saying my system has recovered from an error.

What is considered the highest amount of Vtt that would be safe for 24/7 usage?

I don't really know which one to raise again tbh, whether it be more Vtt, or more Vcore.

Can someone please tell me the highest I can take both of these settings for 24/7 usage?

[EQUANT]

I am currently running 1.575V VTT 24/7 so i guess you can easily increase yours from 1.355

[devhen]

So I've got a D0 i7 920. I could not get it to run stable at DDR3 1600 using any settings so I RAM'd the OCZ 1600 7-7-7 that I bought with it and replaced it with Mushkin 1600 6-7-6 and now I am stable but only if I use 1.435 volts on the QPI. I am only overclocking to 3.36 GHz (blk 160) and my Vcore voltage is at the motherboard's default of 1.25 volts.

So my question is... do you think I will reduce the life span of my i7 by running the QPI at 1.435 volts? I've been doing so for 5 weeks now with no problems. Ironically, 1.435v is my motherboard's default QPI voltage when the memory multiplier is set to 1600 MHz. However, most have been able to run DDR3 1600 with as little as 1.3v on the QPI and usually no more than 1.375v. From what I've read it appears that the i7's memory controller is quite inconsistent when overclocking the RAM (> the default 1066). So I'm feeling like I got an i7 with a "weak" memory controller / QPI. But is 1.435v safe for 24/7? I could always RMA it and probably receive one that will run the same at 1.35v QPI or less.

What do you think?

Thanks,
Devin

BTW, here are my specs:

Intel Core i7 920 - D0
Gigabyte EX58-UD3R
Mushkin 998691 DDR3 1600 6-7-6-18 - 3x2GB

I'm @ 3.36GHz (160 blk), DDR3 1600, 2.8GHz QPI, 3.2GHz Uncore
At Vcore 1.250v, QPI 1.435v, QPI PLL 1.20v, IOH Core 1.22v, ICH Core 1.14v, DRAM 1.65v and everything else default

[saaya]

hey devin, welcome to XtremeSystems
nothing to worry about... will you reduce the lifetime of your processor running higher voltages? most certainly!
but the lifetime of modern processors is unknown, and estimated to be anywhere between 30 and a few hundred years
so if increasing the voltage cuts that down to 20 years or even 10... thats nothing to worry about really, as its very unlikely youll be using the same system in even 3 years from now

i think even with higher vtt than 1.5v and vcore above 1.5v as well, i7 chips can work for a decade or more without any problems... so dont worry about it

[devhen]

saaya,

Thanks for taking the time to respond and for the welcome! I was assuming, and hoping, that that was the case, but I needed an expert opinion. We'll see how long it lasts . I was thinking the same thing-- if I get 3 years of overclocked performance out of this thing I will be happy and ready to move on to the latest and greatest .

Love the sig-- LMFAO.

Devin

[EQUANT]

Hi guys!

I have an i7 920 D0 (3908A419 batch)
GA-EX58-Extreme
6Gb 1866 Mushkin 998687 (Elpida chips)

I am running it at 4.2 Ghz HT on (200x21)
memory@ 2000 mhz
Vcore = 1.4 (1.376 in windows)
VTT = 1.575 !!! (would not be stable with less!)
VDIMM = 1.68V (8-9-8-24)
PLL = 1.9V
... and i pretty much increased all other voltages by 0.22V
Clock skew is 150ps

Is 1.575V for VTT too high for 24/7 usage? I run it on air with Prolimatech Megahalems. Max temp is 65*C under full load.
I see most users can run 4.2 Ghz with much much less VTT voltage than me. What the hell is wrong with my cpu? I guess the latest D0 batches aren't that great overclockers ...

Yesterday i got my first crash in this configuration (blue screen). Today i got another, system in idle mode, just surfing the net ... it just crashed.
Could this mean that something's cracking up?

Oh, and one more thing: lately i noticed that when powering the pc from S3 occasionally it starts freezing randomly: works a few seconds, then it freezes a few seconds, then it works fine for about a minute and it freezes and so on. It won't stop until i reboot, then it works fine.
This doesn't happen each time i restore from S3, it's just random.

Any ideas?

[devhen]

EQUANT,

That is definitely pretty high for QPI voltage but it supports my suspicion that the memory controller on the i7 is terribly inconsistent with some users needing very little extra QPI voltage to get "overclocked" memory speeds and timings while others like ourselves are stuck having to juice up the QPI to rediculous lengths. As I mentioned, I have to use 1.435 volts QPI to be stable at DDR3 1600 6-7-6 while everyone else in the Mushkin forums need no more than 1.375v max to run the same settings. I read one story, and I forget where it was or I would try to post a link, of a guy who went through 4 i7's before he got one that would do DDR3 2000 at a reasonable QPI voltage. It would appear that we got a couple of i7 920's that are "weak" in the memory controller. Possibly would-be 940's or extreme's that got branded as 920's because of their weak bus? I don't know.

It would be very interesting to see what happens with your setup. I think the general belief is that the i7 can run at 1.5 vcore/ 1.5 QPI w/o problems but your case is a perfect experiment for that and I am very eager to see how things go for you.

Good luck and keep us posted.

Devin

[Alexxx650]

1.7 QPI
4560 QPI - 1.72v

[devhen]

Alex,

Impressive! How long has it been running at 1.72v ?