Warning to Overclockers - High VTT may kill CPU

[Siskods9]

http://www.anandtech.com/weblog/showpost.aspx?i=428

[grey_1]

Weren't the E8400s also dying early due to VTT? I'll certainly keep this in mind when I finally upgrade to 45nm penryn. I'm antsy about upping voltages anyway.

Thanks for posting it.

[zer0]

so the limit is 1.4v?

[Tr1cK]

People that crank the voltage and fry their chip are getting what they deserve.

"HURR DURR!! I'm going to run it so the warranty won't cover it!"

It's not rated for those voltages so what makes anyone think it is safe is beyond me.

[Feyy]

Is this not just stating the obvious just like what Tr1ck is implying

[Buckeye]

Anyone know what the Max clock might be if you limit it to 1.4V ?

[walterman]

Found this: http://vip.asus.com/forum/view.aspx?SLanguage=en-us&id=20080323085133828&board_id=1&model=Rampage%20Formula&page=1&count=12

& this:
http://www.anandtech.com/mb/showdoc.aspx?i=3283&p=17

VTT is the termination voltage for data lines used to interface the MCH with the CPU die(s) via the Front Side Bus. Higher values can provide additional FSB overclocking margin, especially with 45nm dual-core processors and quad-cores CPUs in general. We have never found any additional gains to be had above 1.36 when using air- or water-cooling. Setting Auto should default to 1.10V for 45nm CPUs and 1.20V for 65nm CPUs.

& more info here:
http://www.anandtech.com/mb/showdoc.aspx?i=3283&p=18

[Dazz]

VTT is termination voltage which is diffrent compaired to the core voltage, although from what is being said anything above 1.4v on the core or VTT voltage tends to kill 45nm processors, 1.5v for 65nm although i am running mine at 1.54v for over a year and in some cases 96hrs at a time and is still going but my VTT voltage has been set 1.4v, as 1.5v did not yield any improvements.

[zer0]

thanks for the clarification

[slaWter]

VTT is on Auto here, never touched it. Otherwise 1.40V vcore with Load Line Calibration.

[LORD-eX-Bu]

if you didn't already know this you shouldn't be trying to overclock anything.

[CaptNKILL]

I must not have a VTT setting. I've never heard of it.

I have my Vcore set at 1.51 though and its been there for 9 months. My system is perfectly stable.

[Zapablast05]

I must not have a VTT setting. I've never heard of it.

I have my Vcore set at 1.51 though and its been there for 9 months. My system is perfectly stable.

I think that's the VTT setting. I don't see one in my BIOS, but I have a core voltage, NB voltage, SB voltage, RAM voltage, and VCore voltage.


EDIT: I don't have a Vcore voltage, instead it's VTT FSB Voltage. I had it at 1.450 but I just lowered it to 1.375.

[DRen72]

I must not have a VTT setting. I've never heard of it.Try looking for FSB Termination Voltage. Thats what is reads in my boards BIOS anyway.

[CaptNKILL]

Is it just an ASUS thing? I know I've never seen anything like that.

[mullet]

Yeah VTT = FSBv

[MUYA]

Yeah VTT = FSBv
Yeah was gonna say that.

My FSBT is 1.6v as reported by Everest

Any one have any idea on CPU PLL.

[jAkUp]

1.65v here :D Still going strong.

[jcrox]

Has there really been an issue with this.... as in many people have had a problem with failing CPU's and we know it is a VTT issue? Or is this another case of 12 people over clocking the heck out of their CPU's having them die and somehow coming to the conclusion that this must be a VTT issue?

[CaptNKILL]

So is this "VTT" setting another name for the FSB voltage or the CPU core voltage? Or is it something else?

[mullet]

So is this "VTT" setting another name for the FSB voltage or the CPU core voltage? Or is it something else?
:rofl refer to post #16

[mullet]

1.65v here :D Still going strong.

Give it some time.:p

[CaptNKILL]

:rofl refer to post #16
Well people said so many different things, I don't know who's right. :p

[mullet]

Well people said so many different things, I don't know who's right. :p

I know dude, I am just being a mullet.

[Dazz]

VTT (FSB Termination voltage) is FSB voltage, increasing it can allow you to bump the FSB higher indoing so you may also need to increase the north bridge voltage for your motherboard. Core voltage (Vcore) is needed to increase the clock speeds of the processor. VTT tends to not be used much on Extreme Edition processors as you can just increase the multiplier.