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ocing x1900xtx with ati tool

post #1 of 16
Thread Starter 
what should i set my voltages at through ati tool for this card? my vgpu 1.45, mvddc 2.108, mvddq 2.108, and vddci at 1.500. is that correct? never oced graphics card before. i do not want to fry this thing.
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post #2 of 16
Check out this thread and this guide.
You're going to need some better than decent cooling if you're going to play around with voltages. Aside from the core temperature you should also keep an eye on your regulators, because you may actually loose performance (not to mention OC capabilities) if they get too hot (+100*C).
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post #3 of 16
Well, Melcar pretty well took care of that. All I can suggest is not being afraid of a lot of PCIe freq. Your card's performance will thank you for it.
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post #4 of 16
Thread Starter 
how hot can this card get without damaging it? i have zalman vf900 cooler on it, but at 653 and 801 my temps max out at 79 gpu 78 regulator.
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post #5 of 16
Thread Starter 
my pcia is at 105. should i go higher?
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post #6 of 16
Thread Starter 
i just want to get the most out of my card without frying the thing. thx for any help you guys can provide.
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post #7 of 16
Were I you, I'd try all the way up to 120MHz (I have and it works best at 119)

Try to keep the core under 80C for stability though it's safe up into the 90's (the stock coolers keep it around there) if it's worth the heat in MHz. What I mean by that is, if you can go into the low 90's only do it if you pull significant performance that you need otherwise it's not worth it. Also, the regs are good to 100 but also try to keep them under 80C. I lose stability after about 95C.
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post #8 of 16
Thread Starter 
thank you
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post #9 of 16
Increasing the PCIe freq. is hit or miss I guess; I saw no differences when I did it (tested several intervals between 106-120). Some have reported success with it, though.
The sweet spot you will want to reach on the core is 700MHz, since around that frequency is when the most performance increase is achieved. After the 700MHz mark you may start getting diminished returns, as smaller and smaller MHz increase require more and more volts. It will depend on your core, of course. For example, say you can do 705MHz @1.475V but it takes 1.550V to go to 715MHz; not worth it since the only thing that will increase will be temperatures.
Memory is a bit trickier to OC. I found out (thanks to the guide I posted earlier) that VDDCI is the one that allows you the most increases in memory frequency. What's even better, is that VDDCI doesn't seem to add much heat to the regulators and the card in general, as opposed to MVDDC and MVDDQ. At 1.580V I'm able to take my memory to 1035, while keeping the other two at modest levels (2.113V); contrarily, if I keep VDDCI at stock I need about 2.236 on the MVs to achieve the same speeds. The trick is finding the combination that allows you the highest OC at the lowest temperature.
Also, keep in mind that increasing these voltages will increase the overall power draw of your card. At stock my card draws about 27-29A, and now that I have increased the voltages it draws around 32-33A; it also "eats" through 0.2V of my 12V rail . A power hungry beast, but I love it .
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post #10 of 16
Quote:
Originally Posted by Melcar View Post
Increasing the PCIe freq. is hit or miss I guess; I saw no differences when I did it (tested several intervals between 106-120). Some have reported success with it, though.
The sweet spot you will want to reach on the core is 700MHz, since around that frequency is when the most performance increase is achieved. After the 700MHz mark you may start getting diminished returns, as smaller and smaller MHz increase require more and more volts. It will depend on your core, of course. For example, say you can do 705MHz @1.475V but it takes 1.550V to go to 715MHz; not worth it since the only thing that will increase will be temperatures.
Memory is a bit trickier to OC. I found out (thanks to the guide I posted earlier) that VDDCI is the one that allows you the most increases in memory frequency. What's even better, is that VDDCI doesn't seem to add much heat to the regulators and the card in general, as opposed to MVDDC and MVDDQ. At 1.580V I'm able to take my memory to 1035, while keeping the other two at modest levels (2.113V); contrarily, if I keep VDDCI at stock I need about 2.236 on the MVs to achieve the same speeds. The trick is finding the combination that allows you the highest OC at the low
est temperature.
Also, keep in mind that increasing these voltages will increase the overall power draw of your card. At stock my card draws about 27-29A, and now that I have increased the voltages it draws around 32-33A; it also "eats" through 0.2V of my 12V rail . A power hungry beast, but I love it .
That power draw number is wrong or read in a way that needs clarification. Even OCed your ENTIRE computer probably doesn't pull 350 watts very often. If you're reading the amps from ATItool that's not 29A off the 12v rail, it's 29Amps off of the first phase of your GFX card which is at your vcore.

SO... 33A x 1.475vgpu = ~49W just for the core. Probably only 30-50W max for the rest of the card, so, about 90-100W, which fits well into the PCIe+PCIe wattage limit of 150W.

EDIT: I run at about 35.5A @ 1.425v when I am at 715Mhz core speed. That's about 50.5W for the core. You can see the 1950 core revision has a significant power reduction, but not huge.
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