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Memtest error caused by wrong RAM voltage?

Last response: in Memory
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December 30, 2010 10:21:32 AM

Hello

I've got an annoying problem here.

Recently i was having BSOD's very often, i reported those on a forum and they told me something was wrong with my memory.

They advised me to do an memtest.

After 2 hours i already had 29 errors, and thanks to my warranty i've got myself some new RAM.

My system is

MOBO: Asus P6T SE
RAM: OCZ DIMM 6 GB DDR3-1333 Tri-Kit

So i decided to test out my new RAM again with memtest.

I had again 2 errors, each of them in test 5.

Other forums said that errors in test 5 are often caused by wrong settings.

So ye, i've changed my timings in the BIOS to 9-9-9-20 (like manufacturer told) and the speed to 1333 mhz.

Another memtest and this time no errors in test 5.

But now i had errors in test 7.

So the only thing that i haven't changed yet is the RAM voltage, the manufacturer advised me to go to 1.65v.

But apprently mobo's like asus P6T for i7's are very sensitive for ram higher than 1.65v.


I do not wanna risk a broken CPU, so what should i do ?

- Increase ram voltage in order to get no more errors in memtest but risk to break my i7?
- or just live with it and hope that errors in memtest were only caused by wrong voltage of RAM and no more BSOD's will follow?



PS. Also CPU-Z doesn't wanna give me my ram voltage :(  (or i'm looking for the wrong setting...)

PSS If i have to change my RAM voltage, what value in my BIOS do i have to change then?

I see a 'QPI/DRAM core voltage setting' and a 'DRAM bus voltage'.



a b } Memory
December 30, 2010 3:53:06 PM

Raising your DRAM bus voltage to 1.65V will not kill your CPU. In fact, it is recommended to raise your voltage to 1.65, as that is what the manufacturer did to ensure that the frequency and timing were stable. Generally, the specs you see on the packaging or stickers on your modules are what the manufacturer has tested to be the recommended settings. All of the specs together are what the manufacturer claims to be the highest stable setting, thus, if you're going to set one, then set them all to avoid instability issues.

As for the concern of "killing" your CPU, it won't happen. The 1.65V limit is what Intel recommends. Some people have actually volted higher than 1.65V and didn't damage their CPU, but for the sake of caution and warranty, do not go higher.

If you're still uncomfortable with raising the voltage straight to 1.65, then increase it one step up at a time until either you reach 1.65V or you find a lower voltage that your system remains stable at.
Related resources
a b } Memory
December 30, 2010 4:12:55 PM

lol. Even if you didn't understand latin, your replies show it.

Edit: "it" meaning that you're over educated.
December 30, 2010 4:21:36 PM

Oh thank you T_T (luckily i studied latin :pt1cable:  )

Is it possible that the 1.5 voltage gives me errors in memtest and not with 1.65 v ?

Also how can i check my voltage on CPU-Z?
December 30, 2010 4:25:25 PM

Newegg doesn't seem to have exact mine:

But these got the same settings, only the size is 6GB instead of 4GB

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Running in default causes all the errors in step 5, after changing timings manually they disappeard.

Now the only thing which is default is the RAM voltage, should i change it ?
a c 347 } Memory
December 30, 2010 4:27:53 PM

That's why I/we need the exact RAM you have, we need a link to 'your' RAM.

If it's 1.65v running at 1.5v then yes you 'can' generate errors.
December 30, 2010 4:28:54 PM

Ok i decided to put my voltage manually to 1.65v

Which setting in my BIOS should i change:

the "QPI/DRAM core voltage" ?
or the "DRAM bus voltage" ?

I think it might be the first one, i'm not sure...

You guys can tell me.
a c 347 } Memory
December 30, 2010 4:56:23 PM

Yep, that's all I needed!

OCZ3G1333LV6GK http://www.ocztechnology.com/products/memory/ocz_ddr3_p...
1333 MHz CL 9-9-9-20 (CAS-TRCD-TRP-TRAS) @ 1.65v

MOBO ASUS P6T SE http://www.asus.com/product.aspx?P_ID=t4yhK6y9W9o7iQ9E

Q - Have you tried AI Overclock Tuner -> X.M.P.? *
* If the RAM is NOT XMP you'll get a Post Failure or similar oddball/instability.

XMP Failure:
AI Overclock Tuner -> Auto
DRAM Frequency -> DDR3-1333MHz
DRAM Timing Control {enter}
9-9-9-20 (CAS-TRCD-TRP-TRAS)
DRAM Bus Voltage -> 1.65v
a b } Memory
December 30, 2010 5:11:21 PM

-Set the speed to 1333 (Mem multiplier = 10)
-Set the voltage to 1.64xx (whatever number is just below 1.65 as 1.6500 is not possible in the BIOS
-Set the timings to 9-9-9-20
a c 347 } Memory
December 30, 2010 5:14:26 PM

^That's Gigabyte. Set to 1.65v or as close as possible.
December 30, 2010 5:16:01 PM

What do you mean about the AI Overclock Tuner and X.M.P. ?

Does my AI Overclock Tuner have to be set to X.M.P. ?
December 30, 2010 5:20:43 PM

Also speed and timings are the only things i've changed so far in BIOS.

RAM voltage & AI Overclock Tuner are still AUTO
a c 347 } Memory
December 30, 2010 5:24:11 PM

No, it doesn't have to be XMP...but I certainly would try it. I mentioned the 'caveat' also it doesn't always work with 6-DIMMs.

I also assume your RAM is in the correct slots of 1366 {just covering all the bases}:

a c 347 } Memory
December 30, 2010 5:27:27 PM

bertieboy7 said:
Also speed and timings are the only things i've changed so far in BIOS.

RAM voltage & AI Overclock Tuner are still AUTO

If you're going the 'manual' route the 'I' would add to the list: DRAM Bus Voltage -> 1.65v

I would strongly recommend that you do it as I outlined above and not second guess those settings.
December 30, 2010 5:29:34 PM

Yep, i can see my RAM is placed correctly, been done by the company from whom i bought it.

But XMP is like a auto overclock tool, what does it matter then when i change my settings manually?
December 30, 2010 5:30:38 PM

So can you give me then a little overview of how my settings should be when i use XMP ?
a c 347 } Memory
December 30, 2010 5:37:50 PM

If you go the XMP route, first clear your other settings by Load Defaults**, next AI Overclock Tuner -> X.M.P., Save & Exit. The XMP reads the RAM and 'auto sets' everything else. As I said XMP doesn't always work.... it's the best starting place.

**If your SSD/HHD is set from IDE -> AHCI then also enter that value.

XMP info -> http://en.wikipedia.org/wiki/Serial_Presence_Detect#Ext...

December 30, 2010 5:43:16 PM

Ok, put my SSD to AHCI.

Let me try all of these right now.

Thanks for your help.
December 30, 2010 5:58:27 PM

Ok i did the following:

Putting AI Overclock tuner into XMP mode and everything i've changed back to auto.

Restarted and CPU-Z told me he was using timings 8-8-8-20 on 1.5v (not correct)

So i then put AI Overlock Tuner to Auto and put manually timings, speed and bus voltage in.

I couldn't enter in 1.65, it switched automaticaly to 1.66 so i switched it back to 1.64.

I used CPU -Z again, this time correct timings and speed 9-9-9-20 , but voltage stayed at 1.5v however i did change it in BIOS.

Why does it not want to change ?
a c 347 } Memory
December 30, 2010 6:12:28 PM

First, it 100% depends on your RAM. If they're not OCZ3G1333LV6GK then I would double-check the SPD tab as way up the post recommended.

The difference between 1.64 and 1.66 is nearly zip, either will work using the 1.64v is good.

Please took at the Part-Numbers:
December 31, 2010 7:36:30 AM

This is what CPU-Z gives me:





I'm pretty sure that i'm right. Why does my bus voltage do not want to change ?
a c 347 } Memory
December 31, 2010 12:18:42 PM

Found a post about the sticks - http://www.ocztechnologyforum.com/forum/showthread.php?...(OCZ-Gold-1333-2GB)-settings-with-P5Q3


AI Overclock Tuner -> Auto
DRAM Frequency -> DDR3-1333MHz
DRAM Timing Control {enter}
9-9-9-20 (CAS-TRCD-TRP-TRAS) -> the 26 I think was a typo the official site HAS 20
tRFC [DRAM Ref Cycle Timing] = 88 **
DRAM Bus Voltage -> 1.64v
QPI DRAM Core Voltage -> 1.30~1.35v

Per OCZ Staff link above; many of theses settings don't pertain but were listed.
Set Static Read Control to {Disabled} - N/A
Set DRAM Dynamic Write Control to [Disabled} - N/A
Set DRAM Read Training to {Disabled} -N/A
Set MEM OC Charger to {Enabled} - N/A
Set AI Clock Twister to {Light} - N/A
** Set CPU and PCIE Spread Spectrums both to {Disabled}

** Are OCZ Staff recommendations, and 'try' them if the QPI DRAM Core Voltage fails.

December 31, 2010 2:06:38 PM

So you say that if i would change my QPI DRAM core voltage to 1.30 that my bus voltage of 1.64 will stick ?
a c 347 } Memory
December 31, 2010 2:51:17 PM

I don't know what you mean by "will stick?", but yes I would indeed try those values I posted above... Then post the results.
a c 347 } Memory
January 1, 2011 12:33:22 PM

As I say again,use the voltages and settings I've listed above...this isn't my first Rodeo and those values are NOT guesses...they're ALL looked up and per spec.

If you're running 1.65v at 1.5v then you can have a plethora of oddball issues.
January 1, 2011 12:43:46 PM

Ok, i will try these out. thank you
!