Is 1.4v safe for a R9 290?

[Doogles]

My temps are fine core is under 85c and my VRM's don't go over 70c so I should be safe right?

 

[Doogles]

might be of use to you

http://forums.overclockers.co.uk/showthread.php?t=18556274

Thanks I will have a good read after dinner.

 

[Doogles]

Depends whether the target temp has been changed or not though. It's a reference design so yeah normally will throttle at 95c by default.

I find it hard to believe you can keep a reference card at 85c when overclocked with raised volts, unless the cooling has been changed or running a very high fan speed which must be a bit noisy.

Just 100% on the fan I can't hear it over my closed back ATH-M50's I don't care about the noise really. Performance is performance!

 

[Doogles]

What sort of clock speeds are you guys seeing with these voltages? How much of an improvement are you seeing from say 1.2v - 1.3v / 1.3v - 1.4v? Surely it'll hit a cliff at some point just like CPU's where by you'll need huge amounts of voltage for just a couple of mhz

1175/5400 @1.4v not sure if it is 100% stable but iirc it is OCCT stable for 5 minutes so needs a BF3/4 Crysis 3 workout.

 

[Doogles]

Max I've got so far is 1250/1625 +200mv using gpu tweak, sure there's plenty more but that will have to wait till I've got another 290x and both are underwater.

I never seem to get lucky with overclockers (not the store), I have my i5 3570k that does no more @4.3ghz with 1.35v, two HD 7850's that did 1120/5200 (Which I have now sold) and this R9 290 needs so much voltage .

 

[Doogles]

It's fascinating how the results vary from card to card... 6 Billion transistors on the silicon wafer, that's mind blowing too!

I am able to run circa 1125/1575 on stock voltage, +81mv = 1175mhz on the core, +100mv = 1190mhz... Running Unigine Valley for just a few loops as I was interested.

I have noticed some odd behaviour in some circumstances. When overclocking the memory, it will be very stable in game, but come to desktop you notice some screen tearing until you back off the memory overclock.
Push the core too far and it'll artifact but also the system will just reboot, like i've hit the reset button. I've never had that behaviour on previous cards.

I noticed that this card was a lot different to my other cards to overclock too, my only other cards I have had though is my HD 7850's so I don't have much experience.

 

[Doogles]

What things did you notice Doogles?

I wish someone would do an article testing hardware to destruction. I.e; taking say a couple of R9 290's and running them for days on end with huge over volts until they fail.

The restart thing you were taking about, normally with my last cards when I overclock too far normally it would BSOD or if it was only ever so slightly overclocked to far I would have the drivers recover. If the memory clock was to high on my old cards I would always see a black striped screen but with the R9 290 I always just get a black screen and have to push my reset button, no matter what I do.

There are some other things but I can't really remember and I am also very tired lol, hope I make enough sense

EDIT: The other thing I have noticed is that this R9 290 doesn't seem to like changing voltage much, whenever I alt+tab it seems to be slower into the game.