does the A64 have anything like SNDS?

[sandman]

Or is it safe to throw as much voltage as you can at them?

I don't know how this got in here....meant for it to be in xtreme overclocking.

[phobos]

I would also like to know that....

[Tyberius]

only thing ive seen is frying the memory controller from too much voltage, by raising your vdimm too high.

[charlie]

actually, SNDS is pretty much a myth. But if you feed a A64 more than 3.3V Vddr, I'd say you're running about a 10%-20% chance of roasting it...
In the months that A64 has been released, this forum has seen more dead A64's than P4's over the last 2 years!


C

[phobos]

Wow....I read much about dead A64s caused by too high Vdimm. But how about Vcore?

Would 2V be safe?

[I²K]

Originally posted by phobos
Wow....I read much about dead A64s caused by too high Vdimm. But how about Vcore?

Would 2V be safe?

What a question. It wont't be "safe".
But if you wanna try it:D

[phobos]

ok, I asked a little bit ironic :)

But what voltage is safe?

Well 1,5V is safe *lol* but I would like to know a max. 24/7 voltage.
Many Athlon (non 64) users are using >2V aren't they?

What Vcore are AMD64 users running at 24/7?

[Tyberius]

i dont think you need over 2 volts on the a64 to get them up to the max speeds ive seen, around 2.8-3ghz, dont most people use like 1.95?v

[xsky]

aren't the nventiv barebones sold with 1,75V Vcore? So I guess thats pretty "safe"
maybe 1,8 as well. i wouldn't use more than that for 24/7

[Radical_53]

I'd be interested in that one too.

Right now I'm limiting myself to ~1.75V, but back in the days of Socket A, I always used 1.95-2.1V for the CPU, without ever having troubles with it.

Is there anyone who has his A64 from the beginning on running around 1.85V or something like that?

[Tyberius]

I run my Athlon64 at 1.88 vcore 24/7, nice and cool too

[phobos]

I run my Athlon64 at 1.88 vcore 24/7, nice and cool too

Since when do you run it at 1,88V? and what type of cooling do you use?

[Tyberius]

since i did my voltmod,, and for the moment I am watercooling my CPU and my chipset. In the process of adding my GPU into the loop. I didnt really see too much of a temperature rise when i raised the vcore up to 1.88. vdimm mod is done also, but i still gotta mod my 3.3v rail before I can get my HTT freq up higher.

[phobos]

but i still gotta mod my 3.3v rail before I can get my HTT freq up higher.

what speeds are you aiming for?

[saaya]

its not a myth! there are still P4s dieing from too much volts, especially combined with high temps... but the current northwoods seem to be able to take 1.85v+ without a prob.

not all though, ive heard from 2 guys who were loosing mhz after running ~1.85v for some time, one chip pretty much died a few days later.

running 1.85v with current P4s seems to be pretty safe though as long as you keep the temps at a reasonable level.

[Tyberius]

Originally posted by phobos
what speeds are you aiming for?
2.4-2.6 ghz

[phobos]

2.4-2.6 ghz

Why do you need to mod your 3.3V rail? Is it below 3.3V or does your motherboard not offer any chipset voltage settings?

[Tedinde]

Originally posted by charlie
actually, SNDS is pretty much a myth. But if you feed a A64 more than 3.3V Vddr, I'd say you're running about a 10%-20% chance of roasting it...
In the months that A64 has been released, this forum has seen more dead A64's than P4's over the last 2 years!


C

Finally!! One other person agrees with me on the SNDS, Finally. I've had a 1.6a running in my basement F@H for a year and a half now. My first 1.6a. I've been giving 1.87V for over a year now and upping it a little every once in a while watercooled.

It used to be in my Vapo @ 195fsb, and over 2V.

I havnt heard of any recent SNDS in over a year or anyone talking about it. I honestly think it was just an easy way of saying. "it wasnt me how screwed up my chip"

[saaya]

i think snds DID happen, i know people who lost chips from it! i think its a combination of heat and volts, not only volts. and every chip is diferent, while some can take higher volts some just died with more than 1.8v

no idear what it was like in the us, but here in germany dozens of P4s were dropping dead every day.

whther current P4s are still sensitive to high vcore and heat is a diferent question...

[sexsymbol]

Whats the max safe vdimm for 24/7 in a a64??

[saaya]

mickey mouse said 3.5v if your VERY carefull, but its risky i think.
3.3v seems to be ok and if you want to be absolutely save stay at or below 3.2v.

use high quality variable resistors and NEVER change vdimm from the bios once you did the vdimm mod! always use the variable resistor!

[phobos]

use high quality variable resistors and NEVER change vdimm from the bios once you did the vdimm mod! always use the variable resistor!

Why that?

[phobos]

Maybe it would be a good idea to add two capacitors to each vmod, like 33pF and 100nF or smthg like that to prevent any spikes caused by interferences.

[Tyberius]

Originally posted by phobos
Why do you need to mod your 3.3V rail? Is it below 3.3V or does your motherboard not offer any chipset voltage settings?
My gigabyte board has OVP on the vdimm voltage, my maximum vdimm voltage is -0.3v from my 3.3v rail, so to get my vdimm past 3v, i gotta up my 3.3v rail

[saaya]

Originally posted by phobos
Why that?

if you change the vdimm setting in bios after you did a vdimm mod the vdimm does not inrease linearly like without a vdimm mod, and more important, when you reboot to save the new vdimm setting the vdimm will fluctuate a lot and those vdimm spikes are probably what killed so many a64s.

the vdimm can rise up to 3.7v for a few miliseconds even though vdimm is only set to 3.3v, this seems o be too much for the onboard memory controllers to handle...

[phobos]

the vdimm can rise up to 3.7v for a few miliseconds even though vdimm is only set to 3.3v, this seems o be too much for the onboard memory controllers to handle...
Sounds plausible....


My gigabyte board has OVP on the vdimm voltage, my maximum vdimm voltage is -0.3v from my 3.3v rail, so to get my vdimm past 3v, i gotta up my 3.3v rail
Ok, I understand. That's annoying.

[calantak]

I have an fx53 @ 14*210 cas 2 - 2-2-5, the ram is only at 2.7 vdimm, and the vcore is 1.7

the cpu is still at -10 stressed then, could I safely put the vcore at 1.8?

I just wanna know if 1.8volts holds any danger with low vdimm