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Polaris Bios Editing ( RX5xx / RX4xx ) - Page 194

post #1931 of 3438
I'm back on 17.1.2 WHQL which everything is working as 16.9.2 including 5K and OSD RTSS 7.0.0. Up to 1,422Mhz Core but need to re-work vrm pad for better thermals. It's running up good stock timings 2110Mhz memory 0 errors. Maybe I'll try the uber-timings.

Here's my timings for 2110mhz error free :

777000000000000022CC1C0031F67E57F05711183FCFB60D006C070124081420FA8900A0030000001E123A46DB354019


Edited by chris89 - 4/11/17 at 2:45am
post #1932 of 3438
I think the new cards are polaris. So I guess I'll post this here.

RX 580 Red Devil pictured with 8-pin + 6 pin power connectors.

http://www.eteknix.com/powercolor-rx-580-red-devil-golden-sample-pictured-68-pin-power-connectors/
post #1933 of 3438
Quote:
Originally Posted by kithylin View Post

I think the new cards are polaris. So I guess I'll post this here.

RX 580 Red Devil pictured with 8-pin + 6 pin power connectors.

http://www.eteknix.com/powercolor-rx-580-red-devil-golden-sample-pictured-68-pin-power-connectors/
Yeah, they are. Polaris 20.
I wonder if they changed the wiring so that core gets all of it's power from the power connectors and vram from the slot... That 6+8 setup is pretty pointless though. An 8pin can already deliver like 30 amps. You're going to fry something before you can use that much power. That second connector is going to do nothing, but make people think that the card is more power hungry than it is.

unless they wired the core to the 8pin and vram to the 6pin. But they wouldn't do that, would they now?
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post #1934 of 3438
Quote:
Originally Posted by adamvx View Post

Why? I have a card running 24/7 on memory intensive algorith with bilions of mem Error.. So I think single mem errors have absolutly no impact on GPU working...

Do not agree with you . Memory errors are a culprit of a performance decrease, as the all arithmetics and calculations needs to be re-done as there is a mismatch in the output result.

Yes, the memory errors might impact some applications more than others, where the performance might be almost the same, BUT :

Memory errors does show instability which might increase with the time.
You need to find out the maximum memory speed without a single memory error to be absolutely sure about the card consistency.

Skipping the EDC Errors is pointless. If it is making you feel better that your memory is overclocked and unstable, go on but i love any sort of stability and will not make excuses about this.

You are speaking with a database engineer, so my level of perfection might not fit with most of you as overclockers, but- stability first. smile.gif
post #1935 of 3438
Memory errors mean the correction of the chip is working hard, which slows down speed.

http://www.ocbase.com/index.php/download
As for gpu testing, occt latest, direct x11, 640x480 shaders 3, memory 2000mb, error checking on, and set a fps that doesn't overload or make your card drop mhz in throttling. Example 140 or whatever watts works well for your vrm max

It found an issue when i first got my card, at its factory oc of 1288/1.15v that only showed up in gaming months later when i started to get random bsod/reboots. I needed 1.175 instead for that clock.

And unlike unigine/3dmark it actually reports errors! Why don't they make more apps like this. It will report errors before you get a driver crash or reboot if you find your limits slowly by going up 5 mhz at a time. Nowadays most cards don't show artifacts even if there are errors piling up, But internally slow down, so you got to wonder is it better to find the best tested oc or a high number?

@chris89 can you try occt with the settings i list above and fps limit of 400 to start, going up in fps until you hit below your target power (ex 140 watts is safe) and tell me what clock/vcore makes you error free? Curious
Edited by robnitro - 4/11/17 at 4:41am
post #1936 of 3438
Well just so you guys know.. cooling the actual capacitors reducing power consumption. Since I pulled the card back apart I removed the pads from the primary line up caps and remove a couple other pads.

Immediately after doing this, my VRM went from 81C before to 86C. I could now smell "Burning" from the power supply, which I did not smell before. Not to mention the Input to Output power went up about 20%.

So if you want to cool the card, you want to cool all the capacitors, because as they heat up... Obviously i've said this 100 times, the resistance increases... meaning more power... they use more power the hotter they get.

This is annoying but it is what it is... Pulling it back apart but I think I'll use "Thermal Glue" to bridge all the caps together so it's permanent not so hideous looking. I'm trying to dial these in to operate properly on a 500w low efficiency power supply.

@robnitro I'm on a 999w limit from 1422 max to the low end of 1316mhz on 74c max temp 84c hot spot. The card will ride on the hotspot and just below if caps are cooled at 1316Mhz error free. So ideally 1316mhz is probably the max for 5k really for no throttling. However when it does hop to 1366 to 1388 to 1422mhz... the fps goes from 27-28fps to 40fps this is 5k... Though quickly is limited by hotspot and dials back. These cards need way better cooling and more than 40fps 5k is possible stable.

The actual "Core Heatsink" should contact the VRM as well... That would fix this VRM temperature issue. It's difficult to control in the reference default configuration.

See how my voltage on the low end of the 12 volt rail went to 11.469 from 12.438? The PSU is highly efficient when under light load. However with every single capacitor actively cooled it can bring up that low from 11.496 to 11.680 to 11.875v... Saving hundreds really about 100 or more watts at the psu end with caps cooled same clocks, higher performance by 10-15fps. Could see even less loss if done inside the PSU as well to all caps with thermal glue. I need to get some thermal epoxy.

By the way see 1.275v? I once saw 1.438v vCore on 65288... So yeah it gets kinda squirrely when temps get high... 88C max temp/ 88C hotspot causes super high 65288 voltage.

The easiest way to reduce the total card power consumption is to just use 1 large thermal sheet and cover the entire card excluding the core.. cut a square out for the core for thermal paste... that way everything is cooled.. that's the expensive route.


Edited by chris89 - 4/11/17 at 4:55am
post #1937 of 3438
Sorry to no answer your question very clearly @robnitro

I have the card back apart and check gap. On the reference rx 480 the 10 primary larger VRM are exactly 1.00mm high off the PCB. The gap for mounting contact to the VRM is exactly 1.00mm as well. What this tells me is a tiny nano dot of thermal paste per vrm may yield better thermals. A very very tiny amount of paste. However the center line up 10, I call "Secondary" VRM are roughly 0.50 to 0.75mm high. So through the center may benefit from a 0.25mm thickness thermal pad roughly 3mm wide by 52mm long for possible as good of thermal performance as possible. Will be testing this and post results.

As you saw, 86 Celsius on my VRM1 so remember that number. thumb.gif

Please don't do this anyone. Leave your card alone, is what I recommend.

Update - I won't go into full detail as far as what has occurred as a result of cooling caps. Output did go up, average of 9fps to average 21fps. Also psu is not smelling. Tells me I need more than 3166rpm to keep it cool to increase performance further. Very noticeable difference though need more rpm to cool vrm below hotspot.

VRM compression is lacking since VRM height is 1.00mm and mounting is 1.00mm... Need something to increase compression. If the mounting was 0.75-0.88mm then sufficient compression would be there.


Edited by chris89 - 4/11/17 at 7:43am
post #1938 of 3438
Quote:
Originally Posted by nolive721 View Post

I am using Heaven to test both core and memory OCing capabilities dont worry.

as I said on this thread I have reached 1450Mhz core and 2250Mhz memory at decent, read not high, voltage. I am just looking at the last oomph the card can give me for the money I paid (which I am not complaining with of any sort BTW $$/fps is fine with me with my RX480)

According to my experience Heaven do not put such a big load on the card. Try Firestrike extreme or some games like BF1. I have expreienced instability in games on card which was stable in Heaven.

@chris89

i think that pictures are too small

btw. i was googling and i didn't find any proof of decreased capacitor efficiency due to temperature. Do you have some incontestable proof of that?

https://en.wikipedia.org/wiki/Capacitor_types
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post #1939 of 3438
Only proof is my own testing and experimentation. Along with results. With proper pad installation on VRM and all caps cooled. The results are very impressive. See not only does cooling the caps help but must also cool the VRM to reduce total power consumption for more performance... Low loss from input to output makes the card have more real pure clean power to spit out more performance. Input is power from your 6-pin and PCIe slot according to PSU quality and efficiency same would apply to the PSU caps. My PSU Caps are only cooled by a fan not spinning very fast. No direct cooling.

The thermal pasted VRM results were the 2nd results above. Now these results are from proper thermal pad installation and compression on core VRM. Not to mention everything else.

Take a look this is 5k testing. Input to Output on the VRM is 133.50 input to 116.50 output : Loss of just 14.59%... 133.50 divided by 116.50 = 1.1459...

On the previous test with no cooling on the capacitors VRM Input is 151 and output is 122.750 watts : Loss of 23.01%... Make sense? biggrin.gif




post #1940 of 3438
@chris89

just like i thought, bigger pics pls. The last picture looks like thermal imaging camera but it isn't?

BTW why electronical industry do not try to cool down capacitors if it is so efficient. Stupid intel which invest trillion of dolars to reduce the power consumption. The solution was right behind the corner - sink everything in clay.
Edited by Na1l - 4/11/17 at 9:37am
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