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How To: Overclock Your AMD / ATi GPU - Page 3

post #21 of 644
Very nice guide!!! It helped me get a fully stable clock for my 5750 thank youu ;D
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post #22 of 644
I modded my 4850 visiontek bios and rewrite but although the card function ok in games I can't adjust anything in ccc. it not default at gpu 700mhz and 1100mhz memory. I have a accelero twin turbo so there are no heat problem. I would really like to flashed it back to the original specs but no go, winflash said it has a bad bios.
post #23 of 644
Thread Starter 
Quote:
Originally Posted by daldal View Post
I modded my 4850 visiontek bios and rewrite but although the card function ok in games I can't adjust anything in ccc. it not default at gpu 700mhz and 1100mhz memory. I have a accelero twin turbo so there are no heat problem. I would really like to flashed it back to the original specs but no go, winflash said it has a bad bios.
CCC doesn't seem to like BIOS that has been edited anymore.
Your stock BIOS can be downloaded here -
http://www.techpowerup.com/vgabios/1...12.080523.html
Worth giving it a go (make sure you have a 512mb card).

Also, don't forget to fill out your system specs in the UserCP
post #24 of 644
Fan-Curve guide:

First, in thinking about fan-curves you may intuitively assume that a simple linear relation-ship between heat and fan-speed (like in the following picture) perfectly protects your processor from any ill-effects:



This is not completely right. There are several side-factors which affect quantity of heat-production and quantity of heat-transportation over time. I'm only going to explain two of them in laymens words:

1) heat-production: while overclocking the processor you linearly raise voltage and/or clocks, but the relationship between heat and voltage and heat and clocks is exponential, which means aproportional, untill a (theoretic) point where very very tiny amounts of clock or voltage will result in a huge amount of additional heat produced. This effect has it's own name: "law of diminishing returns" and is rooted in the way how electrons move through a conductor - you can not change this relationship. You have the possibility to exactly measure your own personal curve by noting the Amperes your processor is consuming at various frequencies and voltages while at 100% utilization. Your fan-curve will be very similar to that one.

2) heat-transportation: this is a relative slow process, it's not an immediate effect, and the smaller the heat-difference between the heat-transporting material and the heat-source, the longer it takes. It means the bigger the difference in temperature (like 100° C) the faster heat will be taken away. With a fan-cooling the difference between the temperature of the heat-source (the metal-body on the processor) and the heat-"consumer" (the air) is relative small, this produces a considerable delay in heat-transfer. Additionally air does also move relative slow and can't be moved away instantaneously from the heat-source.

So there is a exponential raise in temperature and an exponential delay of heat-transfer, if both come together strong in the wrong moment you can cook your processor in the timespan the action-reaction-chain need to speedup the fan after the temperature-sensor started to see too much heat.

That's why you should make a fan-profile which takes preceding/anticipating steps to work against the delaying factors. Namely an exponential curve a step ahead of the heat-curve.

In the fan-profile editor you can add additional points to the line we had in the picture above by clicking on the line:



Then you grab the point with the mouse and move it around. The point will stay active (you see the highlighted box around it, the other points stay grey). To delete points, active it by clicking the point and pressing the delete key.

Now you add as much points as you need to make a rough exponential curve:



Now there are two additional things to have in mind to adjust this curve:

1) size of the fan or speed of the fan, in general the capacity of the fan to transport heat away
2) quality of the fan and it's bearings

The first point is related to the horizontal range of the curve. You see in the picture that at 84° the fan runs at 59%, if the fan is big it can be enough to compensate a 10° raise in a the next second, if the fan is small it may need too long and the processor jumps to 94° without any counteraction. So depending on the fan you got you may want to move the entire curve to le left, making the fan be a bit ahead of what may happen.

The second point is related to the vertical range of the curve. You maybe see that at 0° the fan is stopped. and then very slowly starts to raise it'S speed. The problem is than fans have a real difficult time to work at very low speeds like 10 cps or a 100. Not only is it electrically difficult, it's also very stressfull to the bearings. Mechanical resistance is a relative big factor with low speeds, but starting to disappear with higher speeds. So in this case you want the fan to rotate at a constant initial speed while being silent, efficient and reduces the stress on the bearings. You want to move the entire curve up, establishing a lower limit for the fan-speed:



I have a 5870 with cooler v1, and I conducted several experiments about how fast can the fan transport heat away and how low do I want to have the temperatures. I tested with various loads and kept in mind that the heat may be produced faster than transported away for a little timespan. Once I was happy with the regular behaviour of my curve (staying below °80) I started slowly overclocking the processor and in each step of raising voltage and frequency adjusting the curve as well, it goes like this:

a) have 100% load
b) raise core-frequency, search artifact
c) raise core-voltage, if there are artifacts
d) raise fan-speed at the specific temperature the core is actually at until at 80°
e) repeat

This is my final curve after overclocking to 1000MHz/1.3V/~82A:



The processor stays firmly below 80° for anything regular (non-FurMarks) and most of the time below 45% fan-speed. Even with FurMarks I have difficulties to really hear the fan. But keep in mind that is just because of how in my card all of the mentioned factors play together (quality of the processor and the fan as well as temperature difference to ambient). I am lucky that I don't hear my fan.

Here is the final behaviour of my fan-profile in a real-world situation (STALKER CoP), approaching 65A:



If I'd play longer the temperature would converge slightly below 80° at approx. 44/45% fan-speed. My ambient temperature is 90°F+/32°C+ as I'm living near the equator.



Keep in mind your uttmost care is for not having a hot processor, and not for having a silent fan! If your overclock results in a loud fan which annoys you while being at 80° you should accept a lower overclock.

Please also keep in mind that you need to find out which is the maximum acceptable temperature of your processor (without trottling), care about the lifetime and subtract 20% and substitute that temperature with the 80° in this guide.
It's always better to be overly cautious when it comes to overclocking.

---------------
Okay, maybe you proof-read it or edit it. It can contain errors, that's because I don't know better, or maybe because I try to make an aspect overly simplistic. Keep in mind I also want to prevent that people burn up their chips, trying to give cautious suggestions.

Marry Christmas BTW

Edit: added real world measures.
Edit: added ambient temperatures
Edited by Ethatron - 12/25/09 at 2:36pm
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post #25 of 644
Nice post. I'd +Rep you but I can't.
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post #26 of 644
I can't run GPUtool for some reason. as soon as I try to run it, a message saying: "an unrecoverable error has occurred...send txt to developer."

Any other programs to test?

thanks.
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post #27 of 644
Great guide!
damn my hd4850.. can´t get past 715mhz (original 665) :S
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post #28 of 644
The Fan curve is a nice addition to the guide. It applies very well for the 5 series cards but for the 4 series you need a more aggressive approach. For example, my 4890s idle between 44-51 @ 65% Fan speed. This is in an antec 902 with very good cable management. The high idle heat arises due to the poor layout on the UD3R mobo. One of the cards can barely breathe so it gives off heat to the second. Consequently, higher fan speeds are required. At 65 degrees I am already using 85 % fan speed. Anything higher than 70 degrees and the fans go to 100 %.


My 5870 Vapor-X card, idles at 28 degrees with a 40 % fan speed settings. That is improvement over the 4890s!! . My XFX 5870 XXX cards idle between 32-35 degrees celsius. Yet again, improvement over the 4 series cards.
 
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post #29 of 644
thanks for the easy to follow guide
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post #30 of 644
Thread Starter 
Etharon, Thanks very much for the effort you put into that fan guide, I'll frop you a PM about it when I get chance
Quote:
Originally Posted by Waterox View Post
I can't run GPUtool for some reason. as soon as I try to run it, a message saying: "an unrecoverable error has occurred...send txt to developer."

Any other programs to test?

thanks.
ATi Tray tools (link in OP) has a decent artifact scanner built in. As does ATi Tool (Different from tray-tools and doesn't stress the cards quite so hard)
Quote:
Originally Posted by calebchosen View Post
Great guide!
damn my hd4850.. can´t get past 715mhz (original 665) :S
Mine is a bit of a golden chip. I am on stock voltage too. Game stable at 730. It's just an early reference design Sapphire.
Quote:
Originally Posted by Wishmaker View Post
The Fan curve is a nice addition to the guide. It applies very well for the 5 series cards but for the 4 series you need a more aggressive approach. For example, my 4890s idle between 44-51 @ 65% Fan speed. This is in an antec 902 with very good cable management. The high idle heat arises due to the poor layout on the UD3R mobo. One of the cards can barely breathe so it gives off heat to the second. Consequently, higher fan speeds are required. At 65 degrees I am already using 85 % fan speed. Anything higher than 70 degrees and the fans go to 100 %.


My 5870 Vapor-X card, idles at 28 degrees with a 40 % fan speed settings. That is improvement over the 4890s!! . My XFX 5870 XXX cards idle between 32-35 degrees celsius. Yet again, improvement over the 4 series cards.
I'd reccomend some trial and error to get where you are comfortable with the balance between noise and temps. Every card is different after all
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