AMD Phenom 2 @ 1.6v ++..Predictions?

cadaveca · Feb 4, 2010

So, as this was a subject brought up many moons ago, and I'm currently transitioning over to DX11, I thought I'd sacrifice a cpu or two to see what happens.

Anyone got some thoughts?

Please keep in mind, this cpu has over 200 hrs of Prime95 @ 1.6v+ already, and has not shown any degredation...

Will it die?

Degrade?

Live a long life?

Fishymachine · Feb 4, 2010

If the ambiental is 20 less than degrees it could live a while under a very good air cooler and even 1,65 on good water
As for clocks... a C2 965 did 4,4 @1,6 air cooled

cadaveca · Feb 4, 2010

Load voltage varies between 1.6 and 1.64.

Clocked @ 262HTT, 3.7ghz. ONLY 3.7GHZ is stable at these volts...3.6ghz will crash. :slap:

CPU VDDA is 2.7v(from 2.5v stock)

Running 1.475v NB, DDR3 @ 2.0v(HCF0 @ 1767, 7-7-7-18)

Cooled by TRUE 120, 60CFM fan, load temps 50c cpu, 45c per core(CPU TEMPS READ 5-8c over core temps).

EDIT: cpu is a 720BE running @ 4 CORE

johnnyfiive · Feb 5, 2010

It needs that much for 3.7GHz? Dayumn!

department76 · Feb 5, 2010

i've heard 1.5v was the "safe" max for PIIs, my C3 does 3.9 with 1.5

i wonder if i got brave and tried 1.6v if i could break that magic 4.0 barrier...

in terms of will it die or not and how long will it live, i think temperature is more important than voltage. although i could see how crazy high voltages could degrade/deteriorate some substrate over time, i don't think a few hundred millivolts over stock would do that...

cadaveca · Feb 5, 2010

OK, now, we gotta ignore the "safe max" as reported. I couldn't care less what is reported as max, as every cpu is different. Also, silicon is a semi-conductor, who electrical properties vary according to temps(hence guys using LN2 and LHe2 in the WR circles).

Typically, I stop giving volts when clocks stop scaling. As you mention, department76, temperature is very important, and typically, is a barrier to scaling before volts are...at least in my experience over the years.

But like I said, I'm working on new builds, and now that I have all of my new cpus(last arrived jsut before I posted this thread), and I won't get much selling this one, I'll drive it into the ground...

I'm not looking for confirmation of anything here...just pure guesses. This chip WILL die at some point...I'll have it no other way.

If my load under prime is only 50c for the cpu sensor, I think that temps are fine.

what is strange though, is that 3.6ghz will crash at these volts...

Steevo · Feb 5, 2010

The only way to know about it is to try as every piece of the die is different, sometimes a bit of too much is way too much, and sometimes you can pump way more than normally possible without damage.

cadaveca · Feb 5, 2010

I firmly beleive that if you keep ALL VOLTAGES within certain ratios, rather than, say, just upping cpu volts, the chance of death is much less.

Stock, cpu volts were 1.325, and CPUNB 1.2v. I have maintained this 0.125v difference, for example(1.6v-1.475 = 0.125v), and I have kept the difference between CPUNB and Memvolts less than the 80% of stock settings, 1.2v and 1.5v(78% with my OC settings).

This way, no part of the cpu is eating excessive volts when switching to lower votlages. Although I do not need 1.475NB volts for 2620mhz(only 1.325v needed), this voltage was increased merely to maintain those ratios.

thoughts? Nine votes, mine included, noone says death? :laugh:

exodusprime1337 · Feb 5, 2010

i would drop the 3rd core and see what it takes for 3.7... 1.6 is not going to kill it tomorrow(temps permitting) but it will shorten the life and can cause a premature chip death...

cadaveca · Feb 5, 2010

same volts required. Funny thing is that it seems that the bad core in this 720BE is not the disabled one...consistent failures on Core1, tried a few boards now and foudn the same core is worse than the disabled one(maybe due to ACC?).

haven't got a board that allows cores 0 and 2 only.

cadaveca · Feb 5, 2010

Let's bump this up and get some more votes.

I'm hoping there will be no degredation/death until 890FX boards with SATA3/USB3 come out...apparantly in april?

Reefer86 · Feb 6, 2010

ive just hit 4.0 on 965c3 on stock volts 1.4

gona try for more now brb. only just got his chip btw.

Update:

4.0 was stable at stock, 4.1 was not

upped voltage to 1.5 and at 4.2 now.

department76 · Feb 6, 2010

fullinfusion said:
I.6+v I call bullshit...99% of PII's wont boot at that voltage what cpu are you claiming is running at 1.6?

i run 1.51v 24/7, although i haven't tried higher myself i don't see how 1.6 would magically not boot.

cadaveca · Feb 6, 2010

fullinfusion said:
I.6+v I call bullshit...99% of PII's wont boot at that voltage what cpu are you claiming is running at 1.6?

LoL. You need a screenshot? Calling me a liar? You'd gonna look pretty foolish as soon as I go back downstairs to that machine... :rolleyes:

As to which cpu, you best read the thread again. PBKAC, much?

cadaveca · Feb 6, 2010

Everest votlage readings:

Note, this is a paid version of everest, and Lavalys are quite quick to fixes issues when you pay them. Reporting is accurate.

nt300 · Feb 6, 2010

I think heat is more of an issue than voltage. You can probably take it all the way up to 1.7v with no issues as long as you keep that sucker cold.

cadaveca · Feb 6, 2010

nt300 said:
I think heat is more of an issue than voltage. You can probably take it all the way up to 1.7v with no issues as long as you keep that sucker cold.

I'd only go over 1.65 if lower than -50, personally, and even then, I'd EXPECT degredation at the least.

nt300 · Feb 6, 2010

Yes I read that somewhere before about 1.5v being the max for PII's. If you fry your CPU wouldn't that damage your motherboard :confused:

cadaveca · Feb 6, 2010

Actually, I have a nice PDF released by AMD(via the AMDGAME website) saying 1.55v is fine on C2 955's...this has been verified by admins here as well.

1:34am here, priming away @ 1.6v+...We'll see if it's still running in the morn.

aCid888* · Feb 6, 2010

Maybe its not booting @ 3.6GHz because the voltage is stupidly high for a low clock like that??? :rolleyes:

If you were trying to kill a chip for a reason, i.e to get the best clock, it would be useful...this on the other hand?....

It also amazes me you expect a sudden death; almost like the PII will burst in to flames like a possessed wench........what I expect is a slow death from far too many volts.

Moral of this post??

If you plan on pushing extreme volts, go extreme on the clocks too or it just isn't impressive.

Edit: Before anyone cries "troll", this is a constructive criticism post and the whole thread is a discussion with many peoples views.....the whole point of a forum.

cadaveca · Feb 6, 2010

Oh, I hear ya, but this is not exactly the best cpu, hence the torture. I'm not doing it to be impressive...lol. I completely agree that it's kinda foolish...but like I said, I don't have much use for the cpu...if it dies or degrades, I'll toss in another cpu and put this one crunching @ stock...assuming that is even possible.

I mean really, it's just a cpu...hardly anything important to me, obviously. :laugh:

I'm more interested in how quickly it will degrade, as if it's pretty fast, relatively speaking, then 1.55v is definately not a good idea for those on air, IMHO.

I also find it quite interesting that just a 25% increase in volts might damage the cpu...shows that AMD's process is a fair bit weaker than Intel's.

I want to see which core would show degredation, too. One of the good ones? The normally disabled one?

Because C3 scales much better than C2, at least in most cases, I think they've done something that makes it more efficient...well, obviously by the lower wattage ratings...but this also means that the cpu's transistors switch with less current...

I plan on picking up either a 555BE, or whatever replaces the 720BE, and doing the same thing.

I will mention, that 3.6ghz takes 1.55v on this cpu.

fullinfusion · Feb 6, 2010

QUOTE by cadaveca.....My posts are my opinion, and may not be based in fact. Please take that into consideration.

practice what you preach :slap:

I removed all my posts sense my opinion dont count by a guy that seems not to take others comments into consideration.

-out-

cadaveca · Feb 6, 2010

I can appreciate that, truly. It's not that I am taking this too seriously...it's just your response was clearly in the wrong, to say that my running @ 1.6v was BS. I would not post anything other than the truth.

I mean, if there's real evidence out there that many Phenom2 won't even boot @ 1.6v, I'd like to see it! Give me more info about this!

And if there's quick damage to the cpu, we can point other users to this thread to show them what they risk.

FYI, that's in my sig as Binge stated I knew alot, but not enough, and that situation was "detrimental to his sources", as much of what I know is correct, but other things can be quite wrong. It was a peace offering between us.

SystemViper · Feb 6, 2010

yea, the cooler you keep the chip the higher you can up the voltage. so it would be interesting to see what cooling is used for the chips that hit 1.6v and over.

I have a 550 BE and 955 that will be experiencing high volts, but i use my SS phase to keep the chips at -30c and below....

aCid888* · Feb 6, 2010

If you really want to impress me, and many, many others...you'd give away this "worthless" (to you any way) chip to a dedicated cruncher (WCG) on the TPU team.

Now that, my man, would earn you some serious brownie points. :toast:

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AMD Phenom 2 @ 1.6v ++..Predictions?

What will happen @ 1.6v+??

Die?

Degrade only, but still work?

No effect?

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