GTX580 Default Vcore Variations

[Flanno]

Update :
Gainward 1.037v
MSI 1.038v
Palit 1.05v
POV 1.05v
Asus 1.05v
KFA2 1.05v and 1.013v
EVGA 1.0v and 1.012v

 

[Flanno]

So amended vcore range is 0.962v to 1.063v

Assuming that Afterburner is reporting correctly, thats a massive difference

Could this be explained by poor yields?

0.962v is the voltage used when the card is idling and the cores are at 51mhz. While afterburner is open, run GPU-Z and you will see the voltage spike as GPU-Z reads the cards. This is the default voltage used when doing something stressful.

1.0v to 1.05v seems to be what people are reporting. I don't think having low voltages like I do make any difference. Maybe run a bit cooler at stock. But when overclocking the 1.0v on one of my EVGA's limits me to 830mhz. I usually just synch both cards to 1.012v which is what the 2nd card runs at. But I need a slight nudge 1.013 to hit 900, and a nice jump to 1.038 for over 900. I'm sure if I ran 1.05 like some of the Asus cards I could probably get really high clocks but am happy to use 830mhz/1.012v for day to day.

 

[GJ02]

flanno whats the max core stable on the evga ?

 

[kmufc77]

running a 120hz screen,thats why i have 405 mhz idle clocks

 

[Flanno]

I've only tested extensively at 920mhz core on both cards and I needed 1.038v. I wasn't prepared to stick the fan at 70% plus to keep it below 80C during benchmarks and as I wanted to use the auto fan profile which is much quieter, I lowered the overclock to 900mhz and got away with 1.013v with auto fan.

So -
830mhz at 1.0v card1, 1.012v card 2
900mhz at 1.013v for both cards
920 at 1.038v for both cards but too hot unless using custom fan profile

For everyday windows use and gaming I use 830mhz at default voltages and don't see temps past 65 degrees or fan speeds past 60% using auto fan profile. It's only a small bump in performance but it does not have any notceable impact to heat or noise levels.

 

[vorticalspace]

I'm sure if I ran 1.05 like some of the Asus cards I could probably get really high clocks but am happy to use 830mhz/1.012v for day to day.

Buts thats the point.

The 1.05v on the Asus/other cards is the default setting.

For you, that would be a fairly major overclock

Interestingly, under load, GPU-Z reports a core voltage of 1.039v & not 1.050 as reported in Afterburner.

Also, voltage in afterburner remains at 1.05 regardless of whether idle clocks or not?

 

[Flanno]

My gpu-z and afterburner don't match up either. Have always known that. There is a difference of exactly 0.01v

GPU-Z card 1 - 0.99v.
Afterburner card 1 - 1.0v

GPU-Z card 2 - 1.002v
Afterburner card 2 - 1.012v

I assume asus just flashed higher voltages on these cards and tested the balls out of them. Explains why some people have said the Asus clocks higher.

 

[vorticalspace]

I assume asus just flashed higher voltages on these cards and tested the balls out of them. Explains why some people have said the Asus clocks higher.

Except that doesn't stack up when generally, higher default voltage normally signifies reduced potential for overclock but with the likelihood of reduced temps.

This appears to apply to CPU's but maybe not to GPU's.

 

[GJ02]

my default is 1.038
i cant get past 915 core with 1.138 max
people with lower and higher default volts of 1.038 are far exceeding my 915 core

 

[vorticalspace]

my default is 1.038
i cant get past 915 core with 1.138 max

Hi
How did you bench?
Please don't say furmark

 

[GJ02]

heaven and vantage
will freeze up and what ever the last scene was it freezes to a colour within that scene ( solid all 1 colour ) and have to reboot

 

[vorticalspace]

heaven and vantage
will freeze up and what ever the last scene was it freezes to a colour within that scene ( solid all 1 colour ) and have to reboot

How many runs before you deem stable.

Does it generally freeze up on the first run.

I know that when I used to run furmark, if the OC was going to fail, it did so quite quickly.

 

[GJ02]

first run it will freeze on anything above 915
915 its hit and miss too
sometimes within 30 seconds sometimes right at the end scene

 

[Sean_UK]

Suggest you back it down to 900 or 910, as it's clearly not stable at 915 either

Seen some poor chap on another forum with a 580 which cant manage anything above 890 stable...

 

[jester600]

My asus card default Vcore is 1.012 Not tried overclocking it yet though

 

[Bri62]

KFA2
1.037
are we doing 3d clock or 2d?

 

[vorticalspace]

My asus card default Vcore is 1.012 Not tried overclocking it yet though

So where does this leave us

In reality, the only meaningful difference between all current 580's is an edited BIOS.

Strikes me that either ASUS know something about these cards(ability to OC) that we don't, or they are taking a bit of a risk

 

[555BUK]

So Strikes me that either ASUS know something about these cards(ability to OC) that we don't, or they are taking a bit of a risk

Probably a bit of both. ASUS will sell more cards because their BIOS allows better overclocks. This makes them "seem" better than alternative vendors, when they are really just selling the same thing. Well done to ASUS for doing something different.

 

[vorticalspace]

Probably a bit of both. ASUS will sell more cards because their BIOS allows better overclocks. This makes them "seem" better than alternative vendors, when they are really just selling the same thing. Well done to ASUS for doing something different.

Yeah, but they must be confident that somebody wont fry their card

If so, with the right cooling, this implies plenty of OC headroom.

 

[gazjones105]

My gpu-z and afterburner don't match up either. Have always known that. There is a difference of exactly 0.01v

GPU-Z card 1 - 0.99v.
Afterburner card 1 - 1.0v

GPU-Z card 2 - 1.002v
Afterburner card 2 - 1.012v

I assume asus just flashed higher voltages on these cards and tested the balls out of them. Explains why some people have said the Asus clocks higher.

where on gpu-z does it show the vcore. is it under the sensors tab and then VDDC???