You will get more GFlops with HT off because the 4 extra threads have to run on the same amount of cores.
Something wrong with your bios, HT on will have 8 threads & HT off 4 threads.

Don't worry about temperature
As long as below 105 C on IBT you are fine
Real life won't hit such high temperature one

@ owikh84 ya maybe something not right with my BIOS, disabling HT does not give me the same result as you showed me, still showing 4 core/8 thread. May try flash BIOS to the latest one and see if that helps.. also stable at 4.5ghz on 1.185 vcore now.. gonna try lower bit more and see what the lowest I can get.

@ OC4/3 haha bro, should try not to see the temps too much, just paranoid as hell. Prime95 blend test maxes temps at 79/80 degrees, but LinX really killer. Of course that was at 4.5ghz 1.200 vcore, now its a bit cooler once I dial down the vcore to 1.185

if remove IHS and use arctic mx 4, what is the temperature drop

9-10C drop.
Coolaboratory Liquid Ultra/Pro will give another 10C drop.

so you mean now my 3770k overclock to 4.8ghz @ 1.38 V temperature 85C , using the coolaboratory + ihs removal = 65C ?

yes indeed it's an 20C improvement with delid + Coolaboratory

bro do you know any expert that show tutorial on how to do ihs removal with correct way. wanna try it out, but too afraid to do as it is easy to spoil the chip @.@

I find THIS is the best chip delidding guide.
Good luck.

thanks bro.

Finally got around to letting Prime95 run longer than a few minutes; 1 hr 25 mins preset Blend test OK. Temperatures look better because I turned on the air-conditioning.

Manual mode (non offset mode) in BIOS setting Vcore to 1.185v but in Windows CPU-Z showing me 1.192v instead, and even weirder when load-testing it goes to 1.200v shown in CPU-Z, any idea why like this?

Image 1 shows right before I stop Prime95;
Image 2 after, and all temps back to Idle temps.



Attached thumbnail(s)

When offset mode is disabled, load-line calibration (LLC) will be active and causing vdrop/vdroop depending on the level you choose.
The vCore accuracy is depends on mobo BIOS.
You might even see a discrepancy with a digital multimeter (DMM) which is supposed to be the most accurate reading in real world.

FYI, the LLC works like this:


So, in your case the vCore is vdrop'ping from 1.192v to 1.2v under load with higher LLC level selected.

ok got it.. thanks! Also in CoreTemp, the VID value shows 1.1759v ..another value which is far from 1.185v lol

better to use offset mode or manual? trouble is I haven't been able to make much sense of how offset mode works.

thanks in advance.

Don't get confused with VID vs vCore as they are different. Every chip was born with its own default VID which is unique from one chip to another. vCore is something that you can set manually in BIOS whilst VID you can't.

VID as shown in CoreTemp, will change with vCore increase. Basically VID is the amount of needed voltage shot into the CPU at startup. It will increase along with the overclock you are applying. Offset mode usually will use this VID to give the final vCore = VID + offset

The vCore shown in CPU-Z is the actual voltage being supplied to the CPU. Manual mode vCore = vCore set in BIOS + LLC

There is an offset mode guide in the first post of this thread and these voltages terms have been discussed for quite a few times already.

I have been using manual mode so far I'm happy with it.

This post has been edited by owikh84: May 20 2013, 10:18 AM

Thanks for the explanation, crystal clear now. I suppose I'll stay on manual mode too. Contemplating if its worth pushing forward to 4.6 or stay at 4.5 as a daily 24/7 usage OC.

What I did notice was this 3770k required less vcore to hit 4.5 than my earlier 3570k.

Generally 3770K has lower VID than 3570K.

Join intel family 2 days ago ( previously AMD owner)

This is my first attempt of overclock Intel CPU.

Proc : Intel Core i5-3570k @ 4.7Ghz
Vcore : 1.35v ( will try lower it and test again)
Motherboard : MSI z77 mpower
RAM : Gskill RipjawsX DDR3 2133 2x4GB
Cooler : Antec Kuhler H2O 920

Prime95 test with 128 min ttf and 90% Max RAM.

haven't delid yet...will try higher speed after buying Custom WC and delided.


This post has been edited by hanny562: May 22 2013, 11:04 PM

the max temps in your first attached image rather scary

hahah yea almost 100 degree..im thinking might be my cooler not that good...changing to Custom WC soon...looking around for a value custom WC XD...or maybe this proc is still virgin( not delided) ><

Voting for delid!

As explained earlier,