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Possible CPU Damage

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November 18, 2011 8:29:18 PM

Last night I attempted my first overclock with my new i7 980. The CPU was running at 3.33Ghz which I increased to 3.5 while the RAM, rated at 2000Mhz, was running at 1333. I increased this to about 1850 then booted Windows. After about 5 minutes I again enter the BIOS to find that the DIMM voltage, which was set on auto had risen to 1.7 when of course it should remain at 1.65 or less with this CPU. I quickly restored the default settings.

Both the CPU and RAM seem to be operating optimally as I have noticed no change in performance and suffered no crashes. I have also tested with Windows Memory Diagnostic which found no errors. I was wondering if my CPU may have suffered permanent damage and if there would be a method of testing for this damage.

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a b à CPUs
a b K Overclocking
November 18, 2011 8:35:03 PM

Nah, you could run that RAM at 1.7v 24/7 without incident (wouldn't recommend it though) I'd take it off auto, and if you're gonna run it that low you could undervolt it quite a bit.
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November 18, 2011 8:37:38 PM

Run Prime95 for 24 hours, then memtest for 24 hours. If both pass with 0 errors, your CPU and RAM are fine.
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November 18, 2011 8:42:26 PM

Thanks, I'll download Prime95. I didn't think it would be too much of a problem I just wanted to be sure.
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a c 172 à CPUs
a c 197 K Overclocking
November 19, 2011 12:24:40 PM

cuecuemore said:
Nah, you could run that RAM at 1.7v 24/7 without incident (wouldn't recommend it though) I'd take it off auto, and if you're gonna run it that low you could undervolt it quite a bit.

The problem is not running the RAM at 1.7 volts. The problem is running the memory controller inside the CPU at 1.7 volts.

There's a reason you see a lot of fairly fast DDR3 running at 1.5 volts today.
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a b à CPUs
a b K Overclocking
November 19, 2011 5:07:20 PM

jsc said:
The problem is not running the RAM at 1.7 volts. The problem is running the memory controller inside the CPU at 1.7 volts.

There's a reason you see a lot of fairly fast DDR3 running at 1.5 volts today.

The reason you see a lot of DDR3 runnining at 1.5v is because of Sandy Bridge. This is an i7 980, and it's IMC's max spec is 1.875v:
http://download.intel.com/design/processor/datashts/320...
Page 22, Table 2-6, fourth line down. It doesn't list a normal value, but that was of course 1.65v.
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a c 152 à CPUs
a b K Overclocking
November 19, 2011 5:19:48 PM

You probably didn't damage the CPU. If you did damage it like you fried it or something it wouldn't turn on at all.
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November 19, 2011 10:43:07 PM

Best answer selected by dylan2448.
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