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post #1741 of 3317
@Loladinas

thanks for the tips, i was wondering which tag stands for this

regarding VRM i was reffering to 1400-1420 mhz, on 1500+ with voltage around 1.35-1.4V VRM temp may start to have an impact on stability as such card will consume 225+ W and the efficiency of VRM may start to play a role. Just like i said on 1400 MHz VRM temp is irrelevent if is below 115 C degress according to my experience.

One question what voltage where you using when overclocking to 1550-1560 range, 1.4V? How quick VRM start to burn? smile.gif It is difficult for me to keep VRM under 115 C on 1480 MHz with 1.312V - too smal alu heatsink.
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post #1742 of 3317
Quote:
Originally Posted by Na1l View Post

@Loladinas
regarding VRM i was reffering to 1400-1420 mhz, on 1500+ with voltage around 1.35-1.4V VRM temp may start to have an impact on stability as such card will consume 225+ W and the efficiency of VRM may start to play a role. Just like i said on 1400 MHz VRM temp is irrelevent if is below 115 C degress according to my experience.

One question what voltage where you using when overclocking to 1550-1560 range, 1.4V? How quick VRM start to burn? smile.gif It is difficult for me to keep VRM under 115 C on 1480 MHz with 1.312V - too smal alu heatsink.
I got pretty lucky with my card, as far as voltage scaling goes smile.gif The highest I've tried was 1.3V, but at that point I'm bumping into the power limit, and removing it completely is... not a good idea, if you plan to keep your card for a while. It's pretty much 1.225V for 1500MHz, 1.25V for 1530MHz, and 1.3V for 1550MHz. I'd have to check to be sure about the temps, but I think it got up to about 70C. I was running a smaller VRM heatsink at the time, so again, no apples to apples comparison. Another variable was that the air that was going into the case was 8-10C, I actually had to run my CPU fan slower to let it heat up a bit and not mess with CLU under the lid.

When I was done modding my card life got kind of in the way, and I didn't have the time to do proper tests... Which I really should do. I'll do a firestrike run or two tonight, with ~20ish C intake, and post temps. That should be a better indication of actual workable voltage.

I did keep my card running at 1500MHz@1.225V for a couple of months, so at least that is going to be doable. I'm running complete stock settings on everything at the moment.

Since I'm not at home now, here are some older pictures from hwbot


I didn't do it chasing high overclocks, I did it because it was fun, I learned something new, and afterwards I ended up with a far quieter GPU

edit: So many spelling mistakes... It's like I'm having a stroke or something, and have to keep editing my post to not look mentally challenged.
Edited by Loladinas - 3/31/17 at 2:30am
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post #1743 of 3317
@Loladinas

impresive, 16k graphic points

unfortunately my card ends up 1480 at 1.3V, IMHO 1.3V is too much, i still have a temperature headroom as i have around 45 degrees on GPU with this voltage but VRM is burnning and reaching 115C. I have a plan to modify a heatsink on VRM but do not expect a lot. I already bought Accelero X1, i have a plan to cut it a bit and form it to the shape of VRM gap with Dremel. Maybe it will help a bit.

On which card do you have such good scores MSI or Sapphire? When did you bought them, i saw some information that AMD impove the production process of RX480 chip in later production.

One more thing, what ASIC do you have on your chip? My is a 80.4%, is there any corelation?

PS i keep on repeating that English isn't my native language tongue.gif
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post #1744 of 3317
Quote:
Originally Posted by Na1l View Post

@Loladinas

impresive, 16k graphic points

unfortunately my card ends up 1480 at 1.3V, IMHO 1.3V is too much, i still have a temperature headroom as i have around 45 degrees on GPU with this voltage but VRM is burnning and reaching 115C. I have a plan to modify a heatsink on VRM but do not expect a lot. I already bought Accelero X1, i have a plan to cut it a bit and form it to the shape of VRM gap with Dremel. Maybe it will help a bit.

On which card do you have such good scores MSI or Sapphire? When did you bought them, i saw some information that AMD impove the production process of RX480 chip in later production.

One more thing, what ASIC do you have on your chip? My is a 80.4%, is there any corelation?

PS i keep on repeating that English isn't my native language tongue.gif
Both cards were bought a couple of weeks apart, either in September or October. Sapphire card is 77.5%, and MSI is 75.8%. I haven't really messed around with the MSI card much so I can't say what overclocking potential it truly has. I think it did like 1370-1380MHz at stock (1.15V) volts, but it was a bit too noisy to my liking at that point, mostly to cool down VRM. It's still running on stock cooling, but I've changed out the stock TIM with CLU, because the heatspreader was nickle plated, and there shouldn't be any issues if I wanted to go back. Now it's just puttering along at 1300MHz@1.025V (I like round numbers, if you haven't noticed biggrin.gif).

I've had good results by cutting up 92*92*15mm aluminum heatsinks. They go for $4-5 online.
Current setup looks like this (Click to show)

I've posted it in one of the threads before, but no harm in linking it again, right? Heatsinks! (Click to show)



Edited by Loladinas - 3/31/17 at 4:18am
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post #1745 of 3317
@Loladinas

i see that your GPU is more flexible regarding voltages, I'm a little bit jealous smile.gif

My card is a first generation RX480 bought just after the release.

My results:

1266 MHz - 1.0438V - offset -56 mV
1340 MHz - 1.1000V - offset 0 mV
1420 MHz - 1.2125V - offset +108 mV
1460 MHz - 1.2625V - offset +162 mV
1480 MHz - 1.3000V - offset +200 mV

Measured in GPU-z with Render Test

Usually i use middle clock, 1420 MHz. On 1480@1.3V i'm exceeding power budget, some slight power throttling, 225+ W. It's for sure not the best sample but i can't complain a lot neighter.

Nice work with VRM radiator, let's say that i do not have so much space around my VRMs so i decide that will use some taller heatsink.
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post #1746 of 3317
@Na1l

Alright, so as promised I did a few runs of Firestrike to check temperatures. Mind you all these are maximum reported values, averages tend to be a wee bit lower. Air temp was 24C.
Everything was set to stop and stock ROM was flashed. First run was done without touching anything, subsequent four were done by setting the voltage through WattTool, the rest were done the same, but with power limit increased by 50%. First temperature listed is the core, second one - VRM. Setting voltage to 1.3V made it produce an audible buzz during first graphics test.

You can see quite clearly where I was hitting the power limit; third and fourth runs before the increase and the last run after the increase. I don't think I should run my card at 1.3V, as the VRM is rated for 192A continuous, and it's cutting a bit too close for comfort biggrin.gif


Code:
1266/2000 124A 127W 123W 1038mV 47C 37C 13354 11859 4618

1266/2000 126A 123W 109W 1000mV 46C 36C 13007 11793 4505
1266/2000 138A 148W 138W 1100mV 49C 38C 13113 11727 4512
1266/2000 151A 177W 145W 1200mV 54C 41C 13032 11866 4504
1266/2000 180A 228W 145W 1300mV 55C 43C 12944 11835 4469

1266/2000 124A 121W 110W 1000mV 45C 36C 13368 11926 4617
1266/2000 136A 146W 135W 1100mV 50C 39C 13391 11831 4616
1266/2000 156A 182W 166W 1200mV 55C 42C 13403 11842 4631
1266/2000 171A 216W 202W 1300mV 61C 47C 13520 11907 4626

1450/2000 171A 199W 181W 1200mV 58C 46C 14833 11887 5117
1450/2000 204A 257W 216W 1300mV 65C 52C 14851 11860 5123

edit: did a few more runs with custom memory timings, CPU and RAM still at stock. A bit surprised by the improved 1500MHz score, how close it is to my previous 1550MHz score with overclocked CPU and RAM. New drivers, I guess.
Code:
1266/2000 129A 131W 124W 1038mV 48C 38C 13799 11932 4687 high perf mode
1266/2000 136A 146W 136W 1100mV 49C 37C 13768 11749 4685
1266/2125 133A 143W 141W 1100mV 50C 38C 13961 11824 4721
1266/2150 138A 148W 137W 1100mV 50C 39C 13961 11915 4718
1266/2175 142A 152W 137W 1100mV 50C 39C 13947 11879 4730
1450/2125 186A 216W 187W 1200mV 58C 46C 15590 11066 5311
1450/2125 184A 215W 190W 1200mV 59C 47C 15487 11807 5312 high perf mode
1500/2125 196A 234W 205W 1225mV 60C 48C 15934 11845 5486

Edited by Loladinas - 4/1/17 at 1:00pm
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post #1747 of 3317
@Loladinas I'm impressed by the performance and work which you have done, thank you.

Regarding VRMs, I also do not feel confortable on 1.3V so i decided to limit the voltage to 1.25V max. I see that you were able to set reasonable temperatures on VRMs, i need to replace my small heatsink.
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post #1748 of 3317
Rather curious about what settings you guys have in crimson for 3dmark, primarily the Texture Filtering Quality and Tessellation mode.

For Texture Filtering Quality I have it on performance and for Tessellation mode, I've tried both AMD optimized as well as Override with tessellation multiplier off/at zero.

That being said, I managed this:


while my max is
http://www.3dmark.com/3dm/18391702?

Currently I haven't tried to go past 1420 yet on this xfx 480 gtr but 1400/2250 is game stable with very little voltage increase (+25mv in trixx, max voltage it or gpu-z sees is 1.225 bu very rarely. Mostly stays under 1.22v)

That being said, I just finished editing bios to where it'll pull up to 225w if needed at 1.3v (if my calculations are even correct biggrin.gif ) but always had it on prior custom bios to only ever pull about 190w at most.
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post #1749 of 3317
Welcome All!
I would like to know how to edit BIOSes with Hex editor ( I am using HxD)
to change default voltages..
Because I cannot change memory voltages with PBE (it is blocked?).
I need to set about 900mV voltage to mem, as it limit lowest core voltage..
or there is another way to decrease Core voltage?
Regards,
Adam
post #1750 of 3317
Clock dictates the "undervolt" and on polaris, an undervolt is an unstable-volt.

Default 65288, 65287 all call on specified voltage according to clock... clock way less across all states and volt way less as well...
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