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i7 980x maximum dram voltage

post #1 of 14
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I recently rma'd my 980x and when I was setting my rma up with intel support they asked what ram I was using. I didn't tell them I was using 2000mhz ram for fear they would assume I overclocked it since the xmp profile bumps the clock up to 143, so I told them I was using 1333mhz ram. They then asked me the model number of the ram so I quickly went to newegg and picked a random 1333 kit. The support agent looked up my ram and told me that it was rated at 1.65 volts and the maximum voltage should be 1.5 which confused me a little since my r3e displays a warning message that stating that intel warns that using voltages over 1.65 may damage the CPU.

Is the 1.65 limit for the 45nm chips or did intel change the limit later on after the board was made? I know that the 980x is a little more sensitive to voltages since it is a 32nm chip but a 1.5 limit really lowers your memory options. I'm also wondering if the agent got it mixed up with the qpi/dram voltage, although I find that unlikely since 1.5 would be pretty high for a 980x.

Luckily they rma'd without a problem but I'm still curious.
    
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post #2 of 14
Ram for a intel x58chipset is 1.65 volts. Not sure why he said 1.5 for though. I have my qpi voltage all the way up to 1.65v and so have others with no issues for testing. As if you use 2,000mhz on up it will require a larger amount of voltage. As i think x.m.p sets mine at 1.7volts int he bios but it runs fine at 1.55volts 24/7. Not sure why you think 143 bclk will mess your cpu up for though. Qpi voltage and bclk isn't the same thing.

How exactly did you mess the 980x up? As i am curious now.
Edited by KILLER_K - 2/8/11 at 7:38pm
post #3 of 14
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Quote:
Originally Posted by KILLER_K View Post
Ram for a intel x58chipset is 1.65 volts. Not sure why he said 1.5 for though. I have my qpi voltage all the way up to 1.65v and so have others with no issues for testing. As if you use 2,000mhz on up it will require a larger amount of voltage. As i think x.m.p sets mine at 1.7volts int he bios but it runs fine at 1.55volts 24/7. Not sure why you think 143 bclk will mess your cpu up for though. Qpi voltage and bclk isn't the same thing.

How exactly did you mess the 980x up? As i am curious now.
I'm not worried about messing up my CPU, I was just worried that intel wouldn't rma my chip since 143 is technically overclocked. I don't know how my chip got fried. I was running it at 3.8 for 24/7 use with the dram voltage at 1.65 and qpi at 1.48. I did have it at 4.4ghz but that was a while ago. Everything was working fine but then I turned it on the next day and it wouldn't boot. I'm still stumped about it.
    
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post #4 of 14
Are you sure you fried your CPU? I've been running my CPU since launch at, BCLK 145, CPU Voltage 1.4375, QPI/DRAM Voltage 1.35V, DRAM 1.65V, CPU PLL 1.89475.

I dont think how your CPU would of fried with your settings but I have a feeling it was a mobo malfunction.
     
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post #5 of 14
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Quote:
Originally Posted by DorkSterr View Post
Are you sure you fried your CPU? I've been running my CPU since launch at, BCLK 145, CPU Voltage 1.4375, QPI/DRAM Voltage 1.35V, DRAM 1.65V, CPU PLL 1.89475.

I dont think how your CPU would of fried with your settings but I have a feeling it was a mobo malfunction.
That's what I thought too. First I thought it was memory but that was fine, then I proceeded to test the psu, gpu and every other component. I was left with either a bad board or chip so I rma'd my board. Not wanting to wait for it to return I decided to buy an evga classified 3. I get free two day shipping from Amazon and i've been wanting to try one of these boards for a long time. When the board arrived, I slapped my 980x in and was certain it would work but it didn't. I had the exact same problem on a brand new board. 2 weeks later I got my rampage 3 back and it was my board, not a replacement. Asus said the board was fine, they tested it with a 920 and had no problems. I'm totally stumped on what happened to my 980x. It was working perfect the day before, I shut down my system and it the next day I couldn't boot into anything. Not windows, or the windows installation disc, acronis backup disk or Linux. I managed to boot into the ultimate boot cd which I used to test everything. I did a stress test on the cpu and it passed which is why I was certain it was the board. Since the stress test was dos based I don't think it works on all cores.

On a side note, after having both the classified 3 and r3e, I much prefer the rampage. The classified is a great board but I am far more impressed with the r3e's bios.
    
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post #6 of 14
Did you update the bios on the r3e around the time the cpu died? 1 member here had his 980x die with his r3e when updating the bios & had to RMA the chip.
    
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post #7 of 14
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Quote:
Originally Posted by FtW 420 View Post
Did you update the bios on the r3e around the time the cpu died? 1 member here had his 980x die with his r3e when updating the bios & had to RMA the chip.
No, I didn't change anything the final weeks of it's wonderful life. I've been using the latest bios for a long time now. I can't remember how long ago I installed it but it was a few days after it was released.
    
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post #8 of 14
Ram volt is rated safe at 1.65v.

If you run your ram at default, you will find that the motherboard is running it at 1.6v usually.

If he told you the ram is 1.65 and intel only allows 1.5v, he is bluffing you.

You should have no problems running your memory 1.65v.

What might have screwed your cpu, is using the XMP.
It is usually set up the volts for uncore of x2 the memory, which is 4000 if you set the memory to 2000.
Uncore of 4000 is very unhealthy for the 980x for 24/7.
The 980x can run the uncore at x1.5 of the memory, which means 3000, which is very safe for 24/7 and you can do that with lower volts for the vtt.

I suggest you next time read about OCing your memory before you do anything, but this doesn't mean you need to limit yourself to 1.5v memories.

If you do insist tho, there are several memories which are 2000mhz and rated at 1.5v.
And still, for the love of god, don't use XMP.
Learn how to OC your memory yourself.
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post #9 of 14
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Quote:
Originally Posted by Defoler View Post
Ram volt is rated safe at 1.65v.

If you run your ram at default, you will find that the motherboard is running it at 1.6v usually.

If he told you the ram is 1.65 and intel only allows 1.5v, he is bluffing you.

You should have no problems running your memory 1.65v.

What might have screwed your cpu, is using the XMP.
It is usually set up the volts for uncore of x2 the memory, which is 4000 if you set the memory to 2000.
Uncore of 4000 is very unhealthy for the 980x for 24/7.
The 980x can run the uncore at x1.5 of the memory, which means 3000, which is very safe for 24/7 and you can do that with lower volts for the vtt.

I suggest you next time read about OCing your memory before you do anything, but this doesn't mean you need to limit yourself to 1.5v memories.

If you do insist tho, there are several memories which are 2000mhz and rated at 1.5v.
And still, for the love of god, don't use XMP.
Learn how to OC your memory yourself.
Now that makes perfect sense. Thanks for the explanation!
    
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post #10 of 14
Quote:
Originally Posted by mrtom82 View Post
Now that makes perfect sense. Thanks for the explanation!
You are welcome

Also just note, that most 980x's, require 1.5v of vtt in order to maintain 4000 uncore. That is way over the safe spec of under 1.4v.
Its fine when you do a few bemchmarks, depends on cooling. But not for 24/7 or gaming.

After you get your CPU from RMA, sit down on a coffee, open the interwebz, and start reading
The 980x has a lot of tricks and is very different over the other 9xx series cpus.
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