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Polaris Bios Editing ( RX5xx / RX4xx ) - Page 176

post #1751 of 3337
@hayame

few questions, did you bench your memory by OCLMembench? What is your score on 1266 core clock and 2300 mhz on memory? Did you modify the timings, with what memory chips your card is equiped, Hynix?

Each score which i was submitting was valided or hasn't been valided due to non-WHQL. Driver settings were default, maybe texture filtering was set to performance as 3dmark allow you to change this setting. For me only validated results count. But out of curiosity i decide to try tesselation off smile.gif

http://www.3dmark.com/3dm/18998978

16781 graphic points - tesselation off

BTW AMD optimised tesselation seems to be the best choice according to my experience.

I'm asking you about the memory timings as they have massive impact on performance, have a look on below results:

1266/2000 with stock timings - Firestrike graphic points: 12953
1266/2000 with uber v2.1 timings - Firestrike graphic points 13643

nearly 700 points increase, it's equivalent of +95-100 mhz on core, a lot

I can't understand why AMD didn't decide to equip RX iwth better memory with higher bandwidth.

Regarding the wattage at 225W, i can tell you that at 1.3v i'm experiencing really small throttling due to lack of power, only in Firestrike.

PS

overclock a bit the DDR4 memory, 2400 isn't optimal. Skylake and Kaby like 3000+ mhz area.
Edited by Na1l - 4/1/17 at 5:38pm
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post #1752 of 3337
ok, just put together a budget rig for a friend, big blue. it has 4 blue led 120mm fans to keep the air flowing. 2x120 pulling in the front and 1 at the top and 1 at the back. i pulled out the 3gb no name ram and put in 8gb kingston fury 1866 ram and bought msi rx470x4gb armor oc card. nice little unit and it runs fine. kind of like the way it plays games. i use my open air build below for myself.
   
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post #1753 of 3337
@Na1l

With OCLMembench, I want to say it's around 225GB/s at 2250, no timings changed at all and the memory isn't hynix, it's samsung.

I haven't tried messing with timings too much other than copying over the timings from 1750 to 2000, but even then I didn't net anything better on OCLMembench vs stock 2000 timings and 2250 speeds. Not to mention I don't feel too safe trying out someones timings that isn't from a gtr, but one of these days I'll look into it more since I have the privilege of dual bios with switch.

As for AMD's decisions on going from 512-bit/hynix (on 390/390x and whatnot) to 256-bit/samsung, The only thing I could honestly complain about is maybe the memory controller based on the few reading I've done on it, but even then that's just being nitpicky. Other than that I think it was fine decision, especially with how some of them can hit 9ghz effective for such a midrange card.

I'll try to see if the settings I've done in these bios will help with getting past 1420, or even help me reach the thermal wall. I've been tempted to just set my TDP/TDA/power limit to 500/380/500 which is close to fury x limits since it has the same vrms.

And I go this stick of memory for free off of a friend and I'm waiting on a sale for some ram sticks with samsung b-die that'll do atleast 14-14-14-35 timings at 3200, but worry not that I don't know about my memory speeds. I have tried to overclock them to atleast 2800 but memtest86 would get some errors so instead I just tightened the timings at 2400 from 16-16-16-39 to 14-15-15-36, not the best but it was something fun to mess with that was free
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post #1754 of 3337
So if i understand well XFX has used really loose timings on GTR as my memory (Ref) score in OCLMembench:

stock timings

1266/2000 - 198 GB/s
1266/2100 - 210 GB/s

Uber V2.1

1266/2000 - 224 GB/s
1266/2100 - 232 GB/s

How have you been able to score at 16 458 Graphics Score at 1420 on core and less bandwidth? Is there any secret, tweak, software optimization?
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post #1755 of 3337
I have no idea my friend. Maybe it might be my high core clock because it's dx11 but I highly doubt it's that.

I'm about to test this at 1.275v to see if I can reach 1450, or anything higher than 1420.

Well Finally hit the thermal wall of 80c (fan curve set to hit 100% at 70c), Decided that 1425 is definitely possible at 1.275v, but not really worth the temps.. So I moved on to messing around with memory timings.

Primarily used the 1625/2000Mhz Mix Timings, I tried to use Uber-Mix Extreme 2.1 and the Light one but both would crash when 3dmark was looking up system info.

1266/2000:

This was with the memory volt at 1050mv (mainly because I was trying to reduce memory errors at 2100mhz memory speeds, which didn't seem to do much)


And at stock memory voltages


1266/2100:

Here is the OCLMemBench with 1625/2000Mhz Mix Timings at 1266/2100

I would like to note that this is about 10GB/s slower than with stock timings at 2200mhz on the memory clocks.

1266 -> 1338 (stock for GTR black edition) -> 1400 (game stable with +25mv increase on the vcore)


As one can see, the memory errors increase heavily from temperature.. or maybe it was the vcore, I really can't tell worriedsmiley.gif . Really sorry about the inconsistency between using gpu-z and hwinfo64

I went back and decided to use the stock timings and stock memory voltages and have it running at 2200Mhz as I'm able to get just about 230GB/s in OCLMemBench and little to no errors running firestrike.
Edited by hayame - 4/1/17 at 11:19pm
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post #1756 of 3337
Quote:
Originally Posted by chris89 View Post

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...
No. I didn't ask if, I asked how.
I will underclock my core because mem is prioryty for me.
Nvm...
I can set voltages for gpu in Polaris Bios Editor but cannot for mem.. and I know I have to hex code it.
I found how to change timings tutorial, and how to change offsets for saphire 480 8g.. but it is not sufficinet as I have some 4gb version and I'd preffer change voltages than set offset
post #1757 of 3337
Even know the memory doesn't report more voltage, it is "Hotter" so the voltage set is what it runs at. Sometimes up to 1066mv will help though were talking about 6.6% hotter modules. If at max tilt clock or even say 2000Mhz memory at 1066mv, still 6.6% hotter than 1000mv. That would be from 80C at 8GB load to 85.28C, quite a lot hotter.

I find stock voltage is ideal to minimze errors, even some have said 966mv reduces errors. I have not tested undervolt memory. If set 966mv, that's from 80C 8GB load to 77.28C... Cool memory means possibly less errors.

The stock 65288 Value will "UnderVolt" so to say if set clock below "Stock" 1266mv. It will go between 1.093v to 1.150v, and change continuously to stay within thermal tolerance.

You could attempt to set 1313Mhz Core @ 1188mv which would be an "UnderVolt" however stability could not be guaranteed. thumb.gif
post #1758 of 3337
Check these out guy's! ill let ya know how they work...


Edited by chris89 - 4/2/17 at 1:42pm
post #1759 of 3337
Hi,

i need help for best timming in my Sapphire rx 470 8gb Samsung memory.








Edited by kdead1 - 4/2/17 at 12:39pm
post #1760 of 3337
http://cdn.overclock.net/9/9f/900x900px-LL-9fbd4c96_i6qi51r7850x.jpeg

How to get -100 or -125 offset (-20X6,25) or (-16x6,25) in this way?
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