• Competitor rules

    Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.

How to overclock a 7850 past 1050MHz?

Got 2 screenies for you, one from stock and one from an OC to 1150/5800 at 1115. Tried the 1200 with 1115, but the driver kept crashing. Both of these are without a run through before benchmark. Temps etc seem ok, right?

Stock
qEg1A.png
OC
hzjhn.png
 
Guys, I've just checked my ASUS GPU Tweak monitor, and even though my voltage is set at 1200, at load the voltage is peaking at 1075. Any ideas? This might be why I can't seem to get the results most people are getting, stable :S.
 
So after uninstalling CCC, I fixed most of my problems. It seems CCC was stopping the voltage modifications from being applied, now I can actually overclock properly.

The fun beings now :D!
 
CAT 12.3 with CCC removed, however, notice a couple of things for me.
2D is disabled in the ASUS tool, then look at GPU-Z, no, it isn't.
Look at the voltage, stock in GPU-Z, but maxed out in the ASUS tool.

Whatever is happening, the ASUS tool isn't working correctly on my Win7 install.

capturewux.png
 
Jarrod said:
So after uninstalling CCC, I fixed most of my problems. It seems CCC was stopping the voltage modifications from being applied, now I can actually overclock properly.

The fun beings now :D!
Click to expand...
This confirms my findings. Best avoid CCC if you want to overclock thes cards.
 
two00lbwaster said:
CAT 12.3 with CCC removed, however, notice a couple of things for me.
2D is disabled in the ASUS tool, then look at GPU-Z, no, it isn't.
Look at the voltage, stock in GPU-Z, but maxed out in the ASUS tool.

Whatever is happening, the ASUS tool isn't working correctly on my Win7 install.

capturewux.png
Click to expand...

Easy way to check if the voltage increase is being applied, do a heaven run at say stock voltage, and do another at a higher voltage. After each run, check the temps, the second run should show higher temps than the first. Obviously this will show if higher voltages are being applied, but not the exact value.
 
I've just ordered one these:

http://www.overclockers.co.uk/showproduct.php?prodid=HS-002-GD&groupid=701&catid=57&subcat=787

I want to try and confirm if its heat that affecting my overclock limits. I'm hitting a tad over 70c at high voltages, 1.2v core, and while I can pass heaven at 1200, I need 1.22v to do it, and have the fan at 100%. I realise this shouldn't really affect the overclockability of me card, but if I can keep the temps down, (and noise!) then I'll be a bit happier. theres summat nagging at the back of me mind regarding this cooler being insufficient for high clocks with some of the less able 7850s to hit 1200. It might also indicate if theres any localised heating/ hotspots occuring on the gpu chip itself thats not being picked up by the temp sensor.
And the fact that I just wanna play with a new toy also probably has summat to about it.:):D
 
I've not received my card yet, but I did install Asus GPU Tweek today. One thing I noticed is that if you have done the PhysX mod, that your main AMD card will not appear, the default NVIDIA card will only show.

Is there a work around for this for those who had a dedicated PhysX card?
 
pieman109 said:
Easy way to check if the voltage increase is being applied, do a heaven run at say stock voltage, and do another at a higher voltage. After each run, check the temps, the second run should show higher temps than the first. Obviously this will show if higher voltages are being applied, but not the exact value.
Click to expand...

I have uninstalled Asus for now. System would reproducibly crash if I went to http://www.virginmedia.com/fasterspeed :eek:
 
Guys,

i had to sign-up and give you some input. This is certainly one of the most interesting threads i read recently.

Here is the problem:

Can those 7850 cards which are overclocked to 40% or more even handle the increased power draw - or would we risk blowing VMR, voltage regulators etc. since the components on the card cannot handle the increased power requirements?

This is in particular true if we talk about running furmark and similar stuff.

Please note that most of the 7850 are missing the second PCIE power connector and the second voltage regulator - it should be obvious that there is problems in the making overclocking such cards to, say, GTX 580 levels and beyond.

To my knowledge, there is only one card which has the 7870 layout with the second PCIE connector and the second voltage regulator - the XFX cards.

Practically, this could mean that people wont see a problem in normal situations, like gaming. Because those apps will usually keep the card below TDP specs. But what happens if you let furmark run and other "hardcore" benchmarks?

Powertune

The other question is how this AMD Powertune mechanism plays a role here. Powertune seems to be a mechanism which keeps the card within TDP specs, and once the card exceeds threshold like 150W, it would throttle down.

According to AMD, this comes into play in apps like furmark/OOCT etc. since normal gaming would not make the card exceed TDP.

The result now of this powertune would be two, good and bad:

*) Bad, since it COULD mean it will throttle your overclock, especially if you use crazy voltages like 1.2V as some do..which without a question would way exceed the 150W TDP spec. This would mean that you guys get crazy overclocks while in reality the card will throttle down due to Powertune.

* Good, since it would protect the card from going beyond the safe TDP. (With only one PCIE connector and the whole second power regulation circuit missing, you simply cannot draw so much power without risking that the card (caps, vmrs etc.) "blow up" at some point...)

But i dont know exactly how powertune is implemented, whether it would really protect the card from a sudden, extreme power surge (eg. if you start running furmark and the card would see a sudden high power draw etc.)

I am really very tempted to get this card now, but i think we need to consider that the power regulation might be under-dimensioned - and this kind of makes me worry a bit. (Which would also lead to the question whether the XFX cards would be safer instead...respective whether the powertune app would be doing exactly what we need, to protect our overclocked cards from "blowing up" in extreme situations like furmark or OCCT)
 
Last edited:
I currently have a 6950 2GB MSI Twin Frozr ii and was looking at the 7850 in crossfire as a replacement or a 7950 single card.

Selling the 6950 I could get around £120 and I've just sold a load of other bits would the price of two be worth it or just go for a single 7950?

Current system

I5 2500k @ 4.5Ghz
8GB G.Skill
P8P67 Pro
6950 2GB
HX650 PSU
Hanns.G 23" 120hz monitor
 
You must log in or register to reply here.
Back
Top Bottom