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i7 860 overclock

post #1 of 50
Thread Starter 
Hi overclock.net

Its been over a year since i bought my i7 860 and im feeling kinda bored with the speeds XD

Its time for me to overclock my cpu, i know the basic stuff like vcore, vtt, bclock etc. and testing with prime95 and core temp

i reckon my cpu is a volt-hungry one which is unfortunate for me since i only have a cm 212+ does anyone else have the same i7 860 as me: Batch #L939B485

anyone have any suggestions?

ps. i have searched the forums already but most of the overclocks are to 4.0ghz like this one http://www.overclock.net/intel-cpus/...ing-guide.html

i want to establish the max safe voltages and temps:
max vcore: 1.4v(abs max 1.55v)
vtt: 1.155v(abs max 1.21v) <- some people disagree and say 1.4v abs max.
max cpu temp: tjuction(100C) but should really be as low as possible optimum 70C but 80C+ is fine.

for my i7 860 overclock im aiming about 3.8-4.0ghz MAX due to my temp restriction.

thanks.
Edited by l3gend. - 1/21/11 at 10:02pm
post #2 of 50
with my 870 i was easily able to over clock it to 4ghz without much of a problem.

my settings are:


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post #3 of 50
Thread Starter 
Hi bobfig,

thanks for the quick reply, isnt ur IMC voltages a bit high, is it safe to run over the intel spec. of 1.21v 24/7?

ive heard that the intel spec is a lot of crap but running it high will it damage ur components?

also your cooling is alot better than mine thats why u achieved 4.0ghz easily.

thanks.
post #4 of 50
im at 4.2ghz 24/7 stable oc with

1.45 Vcore
1.4 VTT
Auto PLL
Auto PCH

edit: i used to run this on a cooler basicly like yours (zigmatec HDt-1283) and it got to 4ghz before the temps where unsafe (80*c)
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post #5 of 50
Quote:
Originally Posted by l3gend. View Post
Hi bobfig,

thanks for the quick reply, isnt ur IMC voltages a bit high, is it safe to run over the intel spec. of 1.21v 24/7?

ive heard that the intel spec is a lot of crap but running it high will it damage ur components?

also your cooling is alot better than mine thats why u achieved 4.0ghz easily.

thanks.
ya i understand my cooling is better. that may say that you might not be able to hit 4.8ghz or so. also to note i have HT on. as for the IMC voltages it what was set by the auto over clock, i just tweaked the settings after that. but i will do a little digging on the subject so i can find that out.
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post #6 of 50
Thread Starter 
hi shorty smalls,

im interested in what your temps read at idle and at max prime95.

i tried overclocking to 3.8ghz but i cant get it stable even at 1.3v

if i increase it to 1.35v max temps would be in the 90C range.

would you suggest any other settings at lower freq.

thanks.
post #7 of 50
Id start at 1.3VCore/1.27VTT and then see how high you can get the BCLK with the multi at its max. You can always lower the multi but then you will need a higher voltage to sustain the higher BCLK as well. You are also going to have to watch your RAM and set the multi(SPD) to keep it within reason until you know the limitations of your RAM. RAM timings are also important as well. Usually you must loosen its timings if you raise its frequency.
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post #8 of 50
Thread Starter 
Quote:
Originally Posted by bobfig View Post
ya i understand my cooling is better. that may say that you might not be able to hit 4.8ghz or so. also to note i have HT on. as for the IMC voltages it what was set by the auto over clock, i just tweaked the settings after that. but i will do a little digging on the subject so i can find that out.
thanks for "digging on the subject" much appreciated bobfig

so you set your IMC to auto? PLL and PCH also to auto?

according to my bios any setting over 1.21v VTT is "high" because the text changes to a reddish/purplish colour...
Edited by l3gend. - 1/21/11 at 10:30pm
post #9 of 50
Thread Starter 
Quote:
Originally Posted by Voltage_Drop View Post
Id start at 1.3VCore/1.27VTT and then see how high you can get the BCLK with the multi at its max. You can always lower the multi but then you will need a higher voltage to sustain the higher BCLK as well. You are also going to have to watch your RAM and set the multi(SPD) to keep it within reason until you know the limitations of your RAM. RAM timings are also important as well. Usually you must loosen its timings if you raise its frequency.
im well aware of my RAM limitations ie. freq and timings, they are 2000mhz and CL9-9-9-27.

i will indeed keep the freq under that and leave the timings at stock until a later date

i see your vtt is manual set, if an error occurs on prime95 would i need to bump up the vcore/vtt or lower the BLCK?

thanks, much appreciated
post #10 of 50
Quote:
Originally Posted by l3gend. View Post
im well aware of my RAM limitations ie. freq and timings, they are 2000mhz and CL9-9-9-27.

i will indeed keep the freq under that and leave the timings at stock until a later date

i see your vtt is manual set, if an error occurs on prime95 would i need to bump up the vcore/vtt or lower the BLCK?

thanks, much appreciated
It depends on your temps. If you are below TJmax then I would bump up the Vcore and VTT, if your temps are getting to high then you should lower Voltage and set the BCLK where it is stable.
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