parhelia voltage mod finished

[Pace]

Read back. It's nothing to do with the clock speeds. It's the fact the core cannot take higher voltages.

Also, any environmental effects are unlikely to affect the voltage in the core, it's pretty well filtered, and won't be long term. I'll let others pass final comment on this. Or have they already done that?

[Fender]

Originally posted by Pace
Read back. It's nothing to do with the clock speeds. It's the fact the core cannot take higher voltages.

Also, any environmental effects are unlikely to affect the voltage in the core, it's pretty well filtered, and won't be long term. I'll let others pass final comment on this. Or have they already done that?

I think you need some courses in electrical engineering
filtering has nothing to do and can't do anything against unreliable voltages ie : + 5.15V instead of +5V.
filtering protects just against quick variations that's all, and pci/agp cards don't "build" their own voltage, they use what they get from the pci/agp bus, can lower it but by coefficients : if a circuitry lowers a +5V to a +3V if it gets 5.5V from a bad mobo/powersupply it will give 3.3V not 3V

[Greebe]

Fender your generalizations are both anemic and rude. The last thing I expected for you todo after our conversation on #murc proves to me beyond a shadow of a doubt how much you really do not know about OCing anything. (and I saved the log)

Buy the card, OC it and watch how long it lasts.

Oh one last thing.. please read

[[GDI]Raptor]

Fender, Matrox didn't make this card with gamers and OC'ers in mind.... This is a board for persons who use their computers to something comletely different than gaming, or that perhaps whant to do some gaming

I remarked with a guy on another forum the AGP aperture size trick, which is quite weird and never seen on other graphic cards (about +40% in opengl with the last driver and only with aperture size set to 256MB) so it gets really interesting in the performances too.

I have never heard about this? What have I missed?

[Greebe]

if a circuitry lowers a +5V to a +3V if it gets 5.5V from a bad mobo/powersupply it will give 3.3V not 3V

That only applies to linear power supplies and not switch mode which Parhelia uses. Shoot almost nothing anymore within a PC uses linear supplies. Time for you to head back to school me thinks.

[Fender]

Originally posted by [GDI]Raptor
Fender, Matrox didn't make this card with gamers and OC'ers in mind.... This is a board for persons who use their computers to something comletely different than gaming, or that perhaps whant to do some gaming



I have never heard about this? What have I missed?

I know that, and I agree with you, but it doesn't forbid us to try

for the aperture size thing, according to beyond3d.com (see the december test) they got it from matrox (check the viewperf bench on this review, quite impressive)

[Fender]

Originally posted by Greebe
That only applies to linear power supplies and not switch mode which Parhelia uses. Shoot almost nothing anymore within a PC uses linear supplies. Time for you to head back to school me thinks.

it was to summarize, but you know perfectly that if the entry voltage isn't perfect, the vcore can't be too (it's just that it's not as simple as 5.5->3.3 of course)

[Greebe]

none of the voltages required by the core run on 3.3.. and yes it is very tightly set.

[[GDI]Raptor]

Originally posted by Fender
for the aperture size thing, according to beyond3d.com (see the december test) they got it from matrox (check the viewperf bench on this review, quite impressive)

Do you have some links?

[Fender]

Originally posted by Greebe
none of the voltages required by the core run on 3.3.. and yes it is very tightly set.

it was an exemple given, I never pretended it to be @ 3.3v

[Fender]

Originally posted by [GDI]Raptor
Do you have some links?

http://www.beyond3d.com/reviews/matrox/parhelia/index.php?p=12#spec

(check the update on bottom of the page)

[Greebe]

But you insist that the internal supply voltages are sloppy and that sir is incorrect.

[funky-d-munky]

There are no set rules for how much a manufacturer gives for over-clock limits 5,10,15%. Some companies tech will be so far out ahead they will place limiters on products so their lower end cards don't clock up to their higher end cards speeds (currently the situation with Ati) Other companies have to clock near the cards threshold because they are trying to stay competitive. This is currently the situation on the Parhelia and Geforce FX.
The gefarce FX in my mind is an example of a card that is volt modded and way overclocked (by evidence of that extreemly elaborate cooling device) by the manufacturer.
The volt modded P seems a lot like a retail GFFX to me.

[Marshmallowman]

I think you can overclock as much as you can want(without crashing) and not do much damage. The problem seems to be the P chips is close to its maxium voltage tolerances, the voltage at which the chips gates can be seriously damaged by either excessively energetic electrons, or maybe even gate saturation which is very bad as it can be catastrophic failure(you get a runaway condition)

What is the voltage supplied to the chips (default), I am thinking it should be in 1.5 to 2 volt range?.

[rylan]

Its 1.8v normal core voltage, which seems to be pretty standard for that transistor size and die process.

There is a certain amount of beneficial electron migration that you can do by increasing voltage, but it is only really effective by lowering the clock speed and keeping the temp down... so its a lot easier on CPUs than graphics cards. It worked especially well on the K6-2 and K6-x+ cpus, but also got me another 100MHz out of my Athlon versus what I was able to get at first.