**Official** Core i7 860/870 overclocking thread

[RJR]

guys, just a question: what is the SAFE voltages for:
vCC, vTT, vPLL and IMC? thanks

That's a loaded question. If you want absolute safety, I'd suggest running at stock settings.

Intel does provide a recommended and absolute max voltage settings they spell out in their data sheets. The absolute max voltages they supply with a disclaimer that states it might harm your processor to run at those settings. So, it's up to each person to determine how much risk they are comfortable with.

Here is a link to the data sheets:
http://www.intel.com/design/corei7/documentation.htm

[KURTZ]

That's a loaded question. If you want absolute safety, I'd suggest running at stock settings.

Intel does provide a recommended and absolute max voltage settings they spell out in their data sheets. The absolute max voltages they supply with a disclaimer that states it might harm your processor to run at those settings. So, it's up to each person to determine how much risk they are comfortable with.

Here is a link to the data sheets:
http://www.intel.com/design/corei7/documentation.htm

i know the data sheet mate but i saw that there is 1.21 for the vTT but in the net many clockers said that we can give 1.50 safely ...

[Infa]

Yes, OFC it works, but Intel dont take any responsb for it if it breaks, MANY HAVE to use upto 1.60 sometimes, often round 1.40-1.50 to keep mem on or over DDR2000...

Still think its kinda wrong? if XMP settings will put 1.55, and Intel not supporting it.... then will we all be theoretical put to ddr1600 for the most? why put a limit, that very much has to be broken most of the time?

well well.

[Snowman89]

How high voltage is safe for 24/7 on watercooling on those chips?

[KURTZ]

How high voltage is safe for 24/7 on watercooling on those chips?

+1

[tonus]

Kurtz, in my case I used this as guidance (This is for eVGA P55 FTW mobo but I'm sure can be applied in any P55 board)

Source

PCIE Frequency Setting to 104MHz. (In some cases this can help maximize BClock)
* QPI Frequency Selection to 4.270 GT/s
* EVGA VDroop Control - Without VDroop
* Bootup CPU VCore - 1.30000V (good for starting point, will likely need to increase for 24/7 stability)
* Eventual CPU VCore - 1.30000V (good for starting point, will likely need to increase for 24/7 stability.)
* DIMM Voltage - 1.65V
* Bootup CPU VTT - 1.400V
* Eventual CPU VTT - 1.400V

Please post a picture with temps in load with linX or IBT, because i want to get corsair H5O.

[xXxDieselxXx]

Please post a picture with temps in load with linX or IBT, because i want to get corsair H5O.

You got it... I'm very happy with the H50



With unlocked 5850

[dan7777]

nice clocks for that 5850

[zsamz_]

diesel temps not a bit high?
i get better temps with coolmaster 212 @ same speed n voltage
i'm waitin on megahalems adapter to test on my 860

[xXxDieselxXx]

diesel temps not a bit high?
i get better temps with coolmaster 212 @ same speed n voltage
i'm waitin on megahalems adapter to test on my 860

Hmm interesting. So far I'm very happy with temps. On normal use never go over 70. During stress test those were the highest temps.

On idle 24/7 they hover upper 20's to middle 30's.

I'm interested to see your results Every CPU is a different animal

[zsamz_]

Hmm interesting. So far I'm very happy with temps. On normal use never go over 70. During stress test those were the highest temps.

On idle 24/7 they hover upper 20's to middle 30's.

I'm interested to see your results Every CPU is a different animal

i'm idlin 25-35c also
goin over 4.1 temps get too high

[xXxDieselxXx]

i'm idlin 25-35c also
goin over 4.1 temps get too high

Agree.. I think 3.8 is average high for everybody. Right after that, things get hot without extreme cooling IMO.

[RJR]

The Mega Shadow is doing OK with the temps so far.

[ezaleina]

RJR what is ur processor batch?

[RJR]

RJR what is ur processor batch?

See post #21, same thread

[K404]

Intel I7 860
MSI GD80
2x2GB Crucial Ballistix NOT best-suited to low-voltage use- im using an older kit
watercooling- XSPC delta block, 120.2 rad with Xigmtatek fans at 10v

Turbo disabled.

At 4GHz, im losing a full 0.1v under load. Given how cool... COLD the PWM heatsinks are, I dnt feel theres any need for such high droop.

All this should speak for itself:









Dont bother asking for Linpack, P95, OCCT You're also very unlikely to get me to show a max Spi 1M...... I have a Quad with HT!

[stasio]

Anybody i7-860 with L926B086 batch ?

[K404]

Updated my BIOS to 158, which fixed vDroop

I now idle at 1.30v and load at 1.33v Im sure I can tweak that down to 1.30v load. Temps are also a touch lower

[unclewebb]

Temps are also a touch lower.

Your temps would be even lower if you used an updated version of Core Temp 0.99.5 that is able to read TJMax from the CPU.

http://www.alcpu.com/CoreTemp/

The latest version of RealTemp also reads these new CPUs correctly.

http://www.fileden.com/files/2008/3/...alTempBeta.zip

[ezaleina]

Anybody i7-860 with L926B086 batch ?

my friend got the same batch with u bro.,and i notice that most shops at low yat plaza also have the same batch..

[stasio]

my friend got the same batch with u bro.,and i notice that most shops at low yat plaza also have the same batch..

Performance?

[K404]

Your temps would be even lower if you used an updated version of Core Temp 0.99.5 that is able to read TJMax from the CPU.

http://www.alcpu.com/CoreTemp/

The latest version of RealTemp also reads these new CPUs correctly.

http://www.fileden.com/files/2008/3/...alTempBeta.zip

IMHO that just shows that the temps reported by all these programs is too open to mis-interpretation at hardware interrogation-> software level.

Just because the software tells me the temps are lower... doesnt mean they *are*. Maybe the latest version will be more accurate... maybe it wont be, but relative to itself, any version used will show a change based on vCore improvements, higher MHz etc.

I trust the contents of your avatar far more than any program

[ezaleina]

Performance?

me also have same batch like u.,but never test the performance yet.,because i've no good hsf & ram bro..

[unclewebb]

IMHO that just shows that the temps reported by all these programs is too open to mis-interpretation at hardware interrogation-> software level.

That was a big problem in the early days which is why Intel started writing TJMax directly into all of their Core i7 / i5 CPUs which any software can read and use. Old versions of Core Temp and RealTemp had to guess at TJMax but Intel finally did us a favor and now both programs are able to read this information from each core of your CPU. When a line of processors is updated, software needs to be updated too.

I trust the contents of your avatar far more than any program

I like my temp gun but at full load running Prime or LinX, it's useless for reporting peak core temperatures. I think what Core Temp or RealTemp reports for Core 0 at full load on these new CPUs is very accurate and directly comparable to other Core i7 / i5 users.

[K404]

4.1GHz @ 1.35v idle, 1.39v load




extended-idle temps drop to 30-32