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post #691 of 4340
Quote:
Originally Posted by greytoad View Post

... Also, when I change all p-states to stock maximum volts and clock, my screen blanks occasionally. Getting the right balance seems important on this card. If it's your 2d/state 0 though. Not much to do but RMA.

My observation with p-state switching is the following. GPU frequency varies in much smaller steps than p-states but VID takes only values from p-states. So your voltage is a step function while frequency is smooth. My last two p-states are 1235MHz@1.006V and 1265MHz@1.025V. If I adjust the power target to get minor throttling, the VID is not reduced until the GPU-frequency drops below approximately 1250 MHz. So the voltage from a given p-state (1.006V) must be sufficient for frequencys up to the average with the next higher p-state (1235MHz + 1265MHz)/2 = 1250MHz. If I overclock only the last p-state to 1300MHz@1.056V the GPU becomes unstable because 1.006V is not enough voltage for (1235MHz+1300MHz)/2 = 1267MHz. The same could happen with all p-states at max OC. Lets take again 1300MHz@1.056V. Then the idle voltage would be used for frequencys up to (300MHz + 1300MHz)/2 = 800MHz. Under (my) stock settings 800MHz would run with 0.825V instead of 0.8V. For the lower p-states this only applies, if memory stays at 300MHz, because otherwise the "memory voltage" is used.



I could be wrong and the monitored frequencys are some averages (so 1250MHz could be 50% at 1235MHz plus 50% at 1265MHz). But then i should get some readings of lower VIDs while throttling in the 1250MHz to 1265MHz range, which is not the case.
Edited by BromoL - 8/18/16 at 11:58pm
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post #692 of 4340
Pounced on an AIB 480 in preparation for my PC downsize next year. Yes, a Nano is smaller, but 4 GB and not HDMI 2.0... um... 480 please?
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post #693 of 4340
Quote:
Originally Posted by slavovid View Post

your platinum also has 1750 mhz ram correct ?

Yes, and it clocks to 1850-1950. YMMV, but the cards with that memory speed seem to have quite a bit more memory clock headroom.
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post #694 of 4340
They cheap out on the 4GB version by using slower Hynix just like they did on most if not all previous 2xx and 3xx cards.
Where as NV pays that little extra for Samsung memory chips which clock higher no matter what card it is. But AMD and it's AIBs are putting those only on 8GB models of 4xx that start at 8GHz. On top of that AMD limits the OC to 9GHz only, NV doesn't.
Seeing how bad the 470/480s are overall and their even worse availability than 1060s I'm still inclined to try a lottery and grab a 1060 instead.
Sure the 480s are more expensive to manufacture than 1060s no doubt but their performance is lower no joke and power consumption way higher which is bad considering how poor most of the cooling solutions on 4xx are. A good OC on 4xx is a big lottery, some barely do 1330-1350, some go above 1400 with high voltage but then AIO cooler needed etc. hell not cost effective.

I think it's still gonna take at least until Navi for AMD to produce a decent GPU compared to NV.
post #695 of 4340
Quote:
Originally Posted by JackCY View Post

They cheap out on the 4GB version by using slower Hynix just like they did on most if not all previous 2xx and 3xx cards.
Where as NV pays that little extra for Samsung memory chips which clock higher no matter what card it is. But AMD and it's AIBs are putting those only on 8GB models of 4xx that start at 8GHz. On top of that AMD limits the OC to 9GHz only, NV doesn't.
Seeing how bad the 470/480s are overall and their even worse availability than 1060s I'm still inclined to try a lottery and grab a 1060 instead.
Sure the 480s are more expensive to manufacture than 1060s no doubt but their performance is lower no joke and power consumption way higher which is bad considering how poor most of the cooling solutions on 4xx are. A good OC on 4xx is a big lottery, some barely do 1330-1350, some go above 1400 with high voltage but then AIO cooler needed etc. hell not cost effective.

I think it's still gonna take at least until Navi for AMD to produce a decent GPU compared to NV.

Most people with memory clocks at 9ghz are more than likely running into transmission crc errors from what I have seen, they just are not checking for them. 8500 seems to be more in line with reality. The Hynix memory on my card, for example, is good for around 1900. Beyond that I run into random strings of transmission retries, which cause hitching and stuttering. Also, AFAIK 8ghz memory is not offered in the density necessary for 4gb/256b.

As for 1400 needing some kind of great cooler or water... that is not really true either. The RX 470 Platinum Ive got, with the stock cooler(RX 480 reference), can do 1400 and it does not have an exceptionally good ASIC (82). The AIB coolers also do really well, despite 2.5 heatpipe gate, which is literally a load of hot air from people who don't understand cooling, heatsink construction, or thermodynamics.

The GTX 1060 is a good card at the $250 price point where the RX 480 is kinda meh at similar prices. RX 470/RX 480 is actually pretty good at ~$200, and the RX 470 is a steal at ~$180.

GTX 1060 3gb is not a great choice over a 4gb card, even at 1080p. There are numerous games that can push close to 4gb in 1080p, and you would have to scale back some settings to medium where a 4gb card would be comfortable with high. If you are a person that dials all settings down to minimum to get the best possible FPS, its not a big deal. If that does not describe you though, you will run into some situations where you have to compromise more on settings.
Edited by KarathKasun - 8/19/16 at 6:33am
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post #696 of 4340
Sapp 470 has worse than 480 reference cooler. No copper insert.
ASIC is irrelevant for clocks really.
Comparing 1060 vs 480 even custom versions with same cooler the 1060 runs cooler and faster :/
There was a 480 Sapp for $239, was, they just took it down, I guess Sapphire doesn't want to offer the reference one anymore. So the cheapest are about $249, none in stock.
1060 custom dual fan is $259 and more available but currently sold out.

Sapp 470 4GB Platinum is $193 and not available either. Too expensive IMHO when a 480 4GB should cost $199 if they bothered to sell them at all and weren't just paper launched. $180 is a price I would consider but $193, no way. Not even taking into account that they should actually be $149 by AMD MSRP and 8GB should be $179.
IMHO AMD and it's AIBs should have gone with 2 versions instead of 4: 480 8GB and 470 4GB.

I don't know what the hell is AMD and NV doing with their 480 and 1060 chips because these cards are almost never at retailers. AMD even worse than NV, a lot worse.
Meanwhile cheaper 1070s are popping up at retailers at more reasonable prices and available...

I have seen many reviews and any OC close to 1400 is just a lucky silicon lottery frown.gif
Some P10 chips won't even break 1330, yet some rare ones can do 1400+.

Anyway, gotta hunt down and try get my $ back for the endless 3 months RMA...
Edited by JackCY - 8/19/16 at 7:12am
post #697 of 4340
Quote:
Originally Posted by JackCY View Post

Sapp 470 has worse than 480 reference cooler. No copper insert.
ASIC is irrelevant for clocks really.
Comparing 1060 vs 480 even custom versions with same cooler the 1060 runs cooler and faster :/
There was a 480 Sapp for $239, was, they just took it down, I guess Sapphire doesn't want to offer the reference one anymore. So the cheapest are about $249, none in stock.
1060 custom dual fan is $259 and more available but currently sold out.

Sapp 470 4GB Platinum is $193 and not available either. Too expensive IMHO when a 480 4GB should cost $199 if they bothered to sell them at all and weren't just paper launched. $180 is a price I would consider but $193, no way. Not even taking into account that they should actually be $149 by AMD MSRP and 8GB should be $179.
IMHO AMD and it's AIBs should have gone with 2 versions instead of 4: 480 8GB and 470 4GB.

I don't know what the hell is AMD and NV doing with their 480 and 1060 chips because these cards are almost never at retailers. AMD even worse than NV, a lot worse.
Meanwhile cheaper 1070s are popping up at retailers at more reasonable prices and available...

I have seen many reviews and any OC close to 1400 is just a lucky silicon lottery frown.gif
Some P10 chips won't even break 1330, yet some rare ones can do 1400+.

Anyway, gotta hunt down and try get my $ back for the endless 3 months RMA...

No, the reviewers are idiots when it comes to overclocking Polaris. They dont adjust anything but power limit and clocks. They don't even make a curve for freq/voltage, which can make a huge difference as the points between p-states are interpolated. For 1400 I have to use the VRM tool to disable the power limit and set a 25mv offset. That gives me 1.2v and ~180w for the GPU itself. Stock power limit for the 470 is only 80-90w and 127w with maxed out wattman power limit.

If I skip all of that, I cant get over 1300 without heavy throttling.

The copper insert does not seem to make much difference either, maybe a few degrees here and there.

AMD MSRP for 4GB RX 470 was $179 just FYI, 470 8gb is "non-standard".

The Sapphire RX 470 Platinum reviews were using the bugged drivers that limited memory overclocks to 50mhz.
Edited by KarathKasun - 8/19/16 at 7:59am
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post #698 of 4340
Which VRM tool?

I've seen many tools from the extreme OCers in Polaris BIOS thread but some were taken down too. I got some saved just in case...
Do you use Wattman or AB or something else to OC? I've heard many complain about Wattman crashing... and AB not supporting Polaris yet.

Do you have some results posted around with your 470 Platinum running stock non throttled clocks and then OC? Maybe I've seen them but there is so much I can't remember it all.
post #699 of 4340
The VRM tool, from this thread...
http://www.overclock.net/t/1605757/vrmtool-a-simple-tool-to-read-and-write-to-i2c-vrm-controllers/0_20
Lets you reduce the reported power from the VRM, 100% power limit = 160% power limit AFAIK.


Here are my best results so far, 2139 in Valley (1350/1925).

http://www.overclock.net/t/1605802/official-radeon-rx480-470-460-owners-club/540_20#post_25435418

This post has results at "stock" with maxed out power limit (1200/1750), ~1900 in Valley.

http://www.overclock.net/t/1605802/official-radeon-rx480-470-460-owners-club/460_20#post_25430857


I use wattman to set clocks and base voltages, VRM Tool to set any offset needed to get above wattman limits and to disable power limit.
Edited by KarathKasun - 8/19/16 at 9:13am
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post #700 of 4340
Are the settings applied by the tool permanent or does it need to be manually applied each system restart? Or can it apply automatically each restart? I have it saved but these are kind of the little details that I find important for everyday use and to consider it as a proper OC tool that is not just for benchmarks.
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