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Sandy Bridge VID's don't match specs

post #1 of 5
Thread Starter 
I've been playing with my i5 2500k for the past week. I have noticed in various monitoring programs that report VID (the CPU's requested Vcore) that the figures that are reported don't match those in the Sandy Bridge technical document. Looking at screen grabs posted by other users, they appear to have the same issue.

The technical doc shows VIDs as nice round numbers, e.g. 1.340v, 1.345v, 1.350v, etc. The VIDs reported by monitoring programs seem to be 0.011v offset from those in the technical docs, e.g. 1.3411v, 1.3461v, 1.3511v.

Anyone know why this is? Is there a bug in the way all the software is reporting the CPU's requested VID? Seems odd that Intel would deviate from the spec sheet by a consistent 0.0011v.
    
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post #2 of 5
can you link technical docs? if your point vid table, what about vdrop? which software you are using? i cant see any problem.
post #3 of 5
Thread Starter 
Intel Sandy Bridge datasheet: http://download.intel.com/design/processor/datashts/324641.pdf

Look at table 7-1 on page 71. This shows the various voltages that the CPU can request through the VID register. The CPU requests a certain voltage based on load/clock/temperature. It does so by outputting an 8-bit value to the VID register in the MSRs. This 8-bit value can be interpretted according to the table in the linked doc.

Using HWiNFO32 or Real Temp the reported VIDs are all offset by 0.011v from the closest comparable voltage in the VID table in the Intel doc.

Note that this is not the same as the actual Vcore. The VID is what the CPU is requesting. The Vcore is what it is actually getting, and in my case, since I have manual override, the Vcore is not in anyway linked to the VID the CPU is requesting.
    
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i5 2500k Asus P8P67 Pro Sapphire HD 5670 12Gb Corsair XMS3 1600 
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i5 2500k Asus P8P67 Pro Sapphire HD 5670 12Gb Corsair XMS3 1600 
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post #4 of 5
Could be that the voltage sensor is calibrated wrong. Could be that the board is delivering voltage that is 11mv high. Could be a software issue.

I wouldn't worry about it. 11mv off is still well within spec.
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post #5 of 5
Thread Starter 
I wouldn't say I'm worried about it. Just intrigued by the consistent 11mv deviation. I'd also add that looking at screen grabs people have posted of their overclocks, I am not the only one to have this 11mv deviation, though I haven't looked closely enough to see whether it is specific to Asus P67 boards.

I suppose the only concern would be that if the VID is being incorrectly reported, then the Vcore might be, too.
    
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i5 2500k Asus P8P67 Pro Sapphire HD 5670 12Gb Corsair XMS3 1600 
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C300 64Gb, 1TB Samsung Seasonic X-560 Silverstone Fortress FT02B-W 
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CPUMotherboardGraphicsRAM
i5 2500k Asus P8P67 Pro Sapphire HD 5670 12Gb Corsair XMS3 1600 
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C300 64Gb, 1TB Samsung Seasonic X-560 Silverstone Fortress FT02B-W 
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