VTT voltage

spookywillow · 12 Aug 2008 at 15:31

i was just reading the wolfdale oc thread and how its VTT that kill these chips off and not vcore, as i now have a wolfdale i wanted to know more about VTT.

searched around a bit as i didn't see that option in my bios and found that its called FSB termination on my board, anandtech had this to say about it

This voltage setting is more commonly known as VTT. This voltage is critical for quad-core overclocking. 400FSB will require 1.41V right off the bat if stability is desired.

now when i had my quad i never even touched this yet it was stable at 400x9 so does it really help?

an overclocking guide at the same site says its vital so would i benefit from having a mes about with it?

Cob · 12 Aug 2008 at 15:37

Personally I don't believe that a quad-core needs anywhere near 1.4v VTT for 400mhz in a modern motherboard. Maybe the old P965 chipset needs the boost, but P35 and P45 won't need that much. That's from my experience anyway (and I've had three quads in five different boards).

spookywillow · 12 Aug 2008 at 15:44

thats what i thought but i just checked the date on that qoute and its from the Gigabyte GA-X48T-DQ6 review on anandtech from january this year, cant really find anything more recent.

HeX · 12 Aug 2008 at 15:48

I've run my Q6600 at 450FSB+ and i've never touched the VTT in my life.

Same with my E8500, ran that at 490 FSB and VTT was on stock 1.2V...

spookywillow · 12 Aug 2008 at 21:20

thanks for the input guys

hi hex

is that the most you can get out of that quad?

kitfit1 · 13 Aug 2008 at 00:05

I've said on various forums that high VTT and High PLL is the main killer for 45nm parts. I've also had 2 E8500's since they were released. The first one ran at 512x9 (4.6ghz) with VTT at 1.17v. My current one runs at 500x9.5 (4.75ghz) with VTT at 1.17v as well. So you see, there simply is no need to raise VTT to the sort of levels that a lot of people are running it at. I saw a "noob" posting for help on a forum yesterday to get his clock stable at 4ghz, he listed his PLL at 1.89v with his VTT at 1.24v and no GTL values set. It's people doing things like that, that are far more likely to kill a cpu than running it at 1.56Vcore.

HeX · 13 Aug 2008 at 08:37

spookywillow said:
thanks for the input guys

hi hex is that the most you can get out of that quad?

Nah, just running it on really low volts atm, not really doing owt with my PC so don't need the clockspeed yet

Will bump it up when I come to play Warhead and FC2

Althulas · 13 Aug 2008 at 13:06

Good input guys I tried lowering mine back down to default and was able to shave some voltage off the VC.

spookywillow · 13 Aug 2008 at 14:43

HeX said:
Nah, just running it on really low volts atm, not really doing owt with my PC so don't need the clockspeed yet

Will bump it up when I come to play Warhead and FC2

cool, thought you may have ran into problems or something lol.

again guys thanks for the info,

spookywillow · 13 Aug 2008 at 23:35

so kitfit, it seems you have ran some serious vcore through your chips. have any degraded or broke? looking to try and get some more out of this chip but never went over 1.45v after reading lots of people say not to go over that.

Big.Wayne · 14 Aug 2008 at 05:05

spookywillow said:
i was just reading the wolfdale oc thread and how its VTT that kill these chips off and not vcore, as i now have a wolfdale i wanted to know more about VTT.

searched around a bit as i didn't see that option in my bios and found that its called FSB termination on my board, anandtech had this to say about it

This voltage setting is more commonly known as VTT. This voltage is critical for quad-core overclocking. 400FSB will require 1.41V right off the bat if stability is desired.

Click to expand...

I've never heard of vTT (aka vFSB or FSB termination voltage) damaging any processors before? :confused:

I read quite a few posts from people stating that high PLL settings can degrade a chip though also GTL?

It's all so confusing lol!

kitfit1 · 14 Aug 2008 at 11:22

spookywillow said:
so kitfit, it seems you have ran some serious vcore through your chips. have any degraded or broke? looking to try and get some more out of this chip but never went over 1.45v after reading lots of people say not to go over that.

Niether of them have degraded, in fact the E8500 in my sig now runs at 4.8ghz Prime stable 8hrs, which it would'nt do a couple of months ago. The first E8500 i had is dead, but only because i shoved 2v through it under Dice going for 5.5ghz

spookywillow · 14 Aug 2008 at 14:58

so say for water what would be the max voltage you would give it for 24/7 usage?