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  • Yes go for 4.2Ghz

    Votes: 12 41.4%
  • Atleast 4.1Ghz

    Votes: 1 3.4%
  • Stick to what I got

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Discussion Starter #1
Got my i7 sig rig stable at 1.312v Vcore at 4.01Ghz 21 x 191. Its summer in the UK so these temps are highest i will ever reach at the moment. Prime95 pushes to ~73*c, ambient ~25*c
Usually here ambient is 21*c max usually lower. So temps not too much of an issue, under gaming i only reach 62*c.

Think i should try for more speed? Im just testing 4.1Ghz 21 x 195 at 1.36v (i always start high
) Max temp in Prime95 is 78*c right now.

Would you push for more? Also i intend to keep this PC for atleast 3 years, then ill downclock it and hand it over to my sister
 

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If it serves the purpose at 4.0GHz then keep it. Why push for more if it does everything you ask it to do at 4. I know, some might say that this is OCN and that you should go for broke but on the OP, you stated that you want to keep it for at least 3 years and then hand it to your sis? What a good brother you are. lol
 

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Discussion Starter #3
You make a good point, yeah i just gave my Q6600 3.2Ghz, ATi 4850, 4Gb G.Skill Pi 1000Mhz Ram, P5Q Deluxe system to her!
Im just seeing if i can squeeze a little more out of the 1.31v Vcore, at 4050Mhz currently.
I noticed i had left CPU PLL at 1.88v, put that back to 1.80v, temps reduced a few *c
4.2Ghz failed at 1.36v so i dont think i can go that high, 4.1Ghz was going well though. Ill see what happens now, maybe high CPU PLL was holding me back a little.
 

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Prime95 isn't the way to go to find out your maximum temperature

Try Running 10 minutes of OCCT, or 2 runs of Intel Burn Test

pretty sure your temps will climb
 

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every 920 step D0 I have setup would do at least 4.2ghz (and I have setup over 30 of them) alot will do 4.4ghz and i've had a few that do 4.5ghz. thats 100% stable at 60-62c full load for 30 minutes, Water cooled of course.
It looks like your air cooled because the 78c is high for water

I'm personally agree with the above post "go big or go home"
but with that said if you dont have a few hundred to throw around on processors then maybe your better off being safe. I would look for a 60-65c stable mark and keep it there.
If your running air and dont have 150-200.00 for water cooling get your a coolit eco or a corsair h50 and cool it that way they are about 60-75.00
 

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Discussion Starter #11
i think my Case is partially to blame, as the 200mm front intake doesnt feel like its pushing any air when i put my hand in the case behind the HDD cage.
What im thinking is getting a 120mm fan and zip tying it above the HDD cage so it pushes air towards the CPU cooler.

VTT is at 1.28v
Ram is 1333Mhz 7-7-7-24-2T Stock
Constant volts:
VDimm 1.65v, QPI PLL 1.18v, IOH Core 1.20v

So far this is what ive tried:
Vcore 1.36, Vtt 1.28, 195x21 = 4.1Ghz Ram at 1560mhz 8-8-8-24-1T -> Failed Quick
Vcore 1.344, Vtt 1.28, 195x21 = 4.1Ghz Ram at 1560mhz 8-9-9-30-2T -> Pass 30mins
Vcore 1.344, Vtt 1.28, 197x21 = 4.13Ghz Ram at 1576mhz 8-9-9-30-2T -> Pass 30mins
Vcore 1.344, Vtt 1.28, 200x21 = 4.2Ghz Ram at 1600mhz 8-9-9-30-2T -> Failed Quick
Vcore 1.36, Vtt 1.32, 200x21 = 4.2Ghz Ram at 1600mhz 8-9-9-30-2T -> Failed Quick
Vcore 1.36, Vtt 1.32, 200x21 = 4.2Ghz Ram at 1600mhz 9-9-9-30-2T -> Failed in 5mins

At this point temps reaching 81*c

Seems like loosening Ram timings helps, i might try Ram at 6x Multi tomorrow to rule the Ram out as a problem.
 

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Your ram speeds are probably to high for your ram manually set your ram multiplier down to about 6 or 8 to start with 10 will probably be the max if you make it that high
 

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Discussion Starter #13
i think 4.2Ghz needs a lot more Vcore, i tried this just now:
Vcore 1.36, Vtt 1.34, 200x21 = 4.2Ghz Ram at 1200mhz 8-8-8-24-2T -> Failed in 7mins
 

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I would stay where you are

maybe push it up to 4.2 for benching and such, but for 24/7 operation the preformance is negligable so why deal with the extra voltage and heat
 
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