You can run other stress testing programs like OCCT, IntelBurnTest, LinX and HCI memtest to ensure that you have covered more areas that might cause instability. Even then, you're still not guaranteed 100% stability but your chances are only higher. Only Intel knows whether the CPU is 100% stable overclocked but they definitely wouldn't publish their custom written stress testing software to the public.

4.2GHz is pretty mild, you shouldn't encounter any issues. If there is any instability and it BSODs, write down the BSOD code and check for it. Most of the time it needs you to increase the voltage for more stability.

My usual procedure for testing an OCed system:
1.)Set Overclock Setting to the desired setting
2.)Use IBT 3 Loops,set to (Total memory GB-1GB,eg:4GB-1GB=3GB)
3.)Make sure it pass
4.)Than lower vcore
5.)Final setting run 20 loops IBT with same memory setting as 3 loops

If this pass,the system is quite stable already

Hi, i would like to ask did anyone tried ASUS P8Z77-M and Intel Xeon E3-1230v2? Plan to upgrade my rig based on this built.Thanks 

heck the 4 threaded Apps are not even fully optimized for the 4 cores, u mostly see the "common" Apps claim to support 4 thread are poorly optimized on the 3rd/4th core.

Core 2 quad is like 5yrs old already. I think we need another 5yrs to fully adopt/optimized the 6 cores.  I wonder who is the guy behind AMD to come up the idea to design bulldozer for "special" 8 core + expecting software developer to adopt it. *good luck with that.    I think Intel high IPC are more feasible for now. 

after seeing your comment about 4/6/8 core proc..... im pretty sure you are yet another keyboard warrior that does not know a thing

just to let you know smth....i hav a i7 3770k on my hand now....its running on all core and its 100%.

after seeing your comment about 4/6/8 core proc..... im pretty sure you are yet another keyboard warrior that does not know a thing

just to let you know smth....i hav a i7 3770k on my hand now....its running on all core and its 100%.

Temp and cooler you use ? 3770k same as 3570k temp ?

What kind of app u are running. I am talking about software the number of taking 4 thread in general. Just because there is a couple of App using 4 thread doesnt mean >50% of them in the market is fully written in 4 thread. 

take for example, Dragon age are only benefit 3 cores, PXSX2 are only recently get quad core support and it still heavily rely on dual core, Skyrim are also put heavy use on dual core when it first launch. There is a reason Intel Stays at quad core for Haswell.

im running on industry software...not some kind of game or blahablah

industry software cannot be consider common software use for common user.    There are atleast 3-4 times more people use consumer software than industry user. Intel is targeting those guys

the amount of proc we take.....could easily par with the amount of end user

http://www.asus.com/Motherboards/Intel_Soc...1155/P8Z77V_LK/
The PCIe x16_3 slot shares bandwidth with PCIe x1_2 slot. The default setting is x2 mode.

2 x PCIe 3.0/2.0 x16 (x16 or dual x8) *3
1 x PCIe 2.0 x16 (x4 mode, black) *4
2 x PCIe 2.0 x1
2 x PCI

http://forum.lowyat.net/index.php?showtopi...post&p=50703693

Yes, Intel uses cheapo thermal interface material aka TIM which has a horrible heat conductivity between die and integrated heatspreader aka IHS.

Die density or vast amount of components being packed in a smaller die size is another culprit. This has admitted by Intel themselves and it looks like there's no action taken by Intel uptil now

i saw on the internet this product: http://www.coollaboratory.com/en/products/liquid-ultra/

seems like it can conduct thermal efficiently.

anyone knows where to get it in our country?

3770K @ 5.0GHz HT 1.44v

IHS off + Arqtic MX-4:


IHS off + Coollaboratory Liquid Ultra:


That's 95C max on 5.0GHz at 35C ambient in a non airconded room
Managed to shave off another ~10C by taking the hottest core & idle temp into consideration.   

With all those applied Stock setting no OC hottest how much Celsius improvement?

Not tested on stock clock.
Go buy test it yourself & share here. 
but who wants stock clock for 3770K?