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*** Official OMG I've finally got my 5850 thread **

Its just a software bug, look at this trace. See where it says 1.65v, its not. Check out the current consumption.

cmd9.jpg


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gareth170 said:
if u cannot overvolt the card why does the voltage change by itself?

also why does asus and msi cards allow it?
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Allow what? Over voltage?

Oh I see what you mean, sorry its Engineer speak. Overvolt means to go out of spec and cause damage. All the cards allow voltage change up to a hardware limit. It just wont let it go too far, looks like the limit is less than 1.4v. It may say 1.6v, but its not happening on the board.

http://blogs.amd.com/play/2009/09/2...ies-graphics-cards-designed-by-the-community/
With the ATI Radeon HD 5800 series we’ve implemented a hardware-level overvolt protection scheme where a signal from the regulators can be fed into the GPU directly and the GPU can take action if the regulators indicate they are operating out of their specification. In the unlikely event that such a scenario happens, rather than the board turning off, the GPU is designed to clock down to get the regulators back into a normal operating zone and then clock back up when they have done so.
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It'll go to its limit whatever that is, it may be a bit higher than you can reach with the afterburner. I'd bet its 1.37v like the last lot. If it were 1.65v it would shoot of the scale bigtime.
 
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I think its actually pretty cool, takes some of the risk out of it. When hex addresses are used on voltage controllers, its so easy to make a mistake and feed the wrong voltage. And 1.35v+ is lot for these cards anyway. To get higher frequencies the temps need to come down before you need that voltage level.
 
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the max on MSI Afterburner is 1.35v, so maybe thats the max of card.

i can do 1000mhz with 1.25v but when it says 1.65v does it mean its still at 1.25v or jump to the max 1.35v?
 
I dunno, hard to say. If you could read the VDDC current, which you could if GPU-Z or Riva was working, then you could tell what's going on. My guess is if its requesting 1.6v it going to the cards max 1.35v+. But then again it may just use the last working register values so 1.25v.
 
fornowagain said:
I dunno, hard to say. If you could read the VDDC current, which you could if GPU-Z or Riva was working, then you could tell what's going on. My guess is if its requesting 1.6v it going to the cards max 1.35v+. But then again it may just use the last working register values so 1.25v.
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OK, I think it works as expected below the Max

I could get to about 935mhz @ 1.162volts on the core
needed 1.240 to the 1ghz mark

at the lower voltages I was looping Crysis bench so I know the voltages were incremental as when the GFX card failed to respond a tweak of the voltage allowed higher stable clockspeed

I could not accurately measure voltages except to say when I could afterburner gave the same numbers
 
Mine too hits 1ghz with 1.25v :D Max core temp is 41C :cool:

Crysis 1080p/high/4xAA/dx9 - 51avg/28min/60max

58501ghzcrysishigh4xaa.jpg


I've found though that GPU clock tool is causing the vcore to randomly go to max (whatever that is) and causing the VDDC temps to go way too high. If I can keep it at 1.25v then it's no problem and I think 1ghz could be a 24/7 overclock. Roll on modded bios' and full afterburner support.
 
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No, it's definitely pushing the voltage up to max(probably only to 1.35v as fornowagain says). VDDC temps go really high under load when this happens.

I've just discovered that if you close GPU clock tool, after setting the clock, the voltage remains at 1.25v and the clock stays set
 
In afterburner and GPU clock tool. As Fornowagain says, it shouldn't be actually going over 1.35ish.

If I close GPU clock tool after setting the clock then it doesn't happen.
 
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