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post #1551 of 4140
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Quote:
Originally Posted by nX3NTY View Post

I have tried flashing 1500MHz timings on my card, it locks up immediately after launching games. It could handle 1750MHz timing but I can't reach the same max clock as before

at the 2000mhz you probably wont do 1500mhz timing (im a 1750mhz 4gb Nitro+) but 1750mhz or 1625mhz maybe.

Did you test the bandwidth with OCLMembench? Dont think of it in raw numbers think of effective bandwidth. My RX 470 according to GPUZ has 230gb/s but is performing higher than that (more like 240-250gb/s or like its at 1900mhz+)due to the tighter timings. With the tighter timings you might not reach the same memory clock but still get higher performance.

the tighter timings alone brought me from 135 to 175, then the extra 50mhz to 180gb/s in OCLMembench. I imagine with the 2k mhz memory you can do far better
Edited by Echoa - 9/24/16 at 9:56pm
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post #1552 of 4140
Quote:
Originally Posted by Echoa View Post

at the 2000mhz you probably wont do 1500mhz timing (im a 1750mhz 4gb Nitro+) but 1750mhz or 1625mhz maybe.

Did you test the bandwidth with OCLMembench? Dont think of it in raw numbers think of effective bandwidth. My RX 470 according to GPUZ has 230gb/s but is performing higher than that (more like 240-250gb/s or like its at 1900mhz+)due to the tighter timings. With the tighter timings you might not reach the same memory clock but still get higher performance.

the tighter timings alone brought me from 135 to 175, then the extra 50mhz to 180gb/s in OCLMembench. I imagine with the 2k mhz memory you can do far better
Can you pointed me to this OCLMembench? I found several, I wanted to use the same as you did
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post #1553 of 4140
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Quote:
Originally Posted by nX3NTY View Post

Can you pointed me to this OCLMembench? I found several, I wanted to use the same as you did

first post of this thread

http://www.overclock.net/t/1604567/polaris-bios-mod-rx480
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post #1554 of 4140
I also forgot to point out, my fear with that power spike on my 470 is I only have a 550w PSU, so much higher, A: my card will fry or B: I'll draw over the limit and toast my PSU or just shut my pc down. So I'm a little hesitant on any more OC for a bit lol
    
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post #1555 of 4140
Quote:
Originally Posted by Echoa View Post

first post of this thread

http://www.overclock.net/t/1604567/polaris-bios-mod-rx480
Right, here is the result. I don't know why the few last chunk is 5.1GB/s probably because some program use the VRAM and force the program to use system memory? I'm using the PCIE x8 3.0 slots since the top x16 slots have nearby PCIe x1 soundcard that heats up the back of the card.

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post #1556 of 4140
Thread Starter 
Quote:
Originally Posted by nX3NTY View Post

Right, here is the result. I don't know why the few last chunk is 5.1GB/s probably because some program use the VRAM and force the program to use system memory? I'm using the PCIE x8 3.0 slots since the top x16 slots have nearby PCIe x1 soundcard that heats up the back of the card.


its windows causing it, its normal don't worry about the last little bit

Not as big a difference for the 2000mhz memory it seems, though is a slight difference. Looks like the 2000mhz will probably benefit more from clock speed but if you can reach the same clocks at 1750mhz timing it would be a bit faster.

Thanks for the results, cool to see that even though I'm still a good 20gb/s off I got a lot closer than before tongue.gif

Edit: trying 1850mhz which puts me @190gb/s if it's stable without errors

Edit: perhaps there isn't that much difference between the 1625mhz and higher timings? That would explain the smaller boost.

Score from 1350/1850mhz (1500 timings)






thats as far as i can push the memory, gonna run this a few days and hope its error free, if its not then back to 1800mhz and call it a day
Edited by Echoa - 9/24/16 at 11:29pm
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post #1557 of 4140
Thread Starter 
Quote:
Originally Posted by Tisser12 View Post

I also forgot to point out, my fear with that power spike on my 470 is I only have a 550w PSU, so much higher, A: my card will fry or B: I'll draw over the limit and toast my PSU or just shut my pc down. So I'm a little hesitant on any more OC for a bit lol

No you're more than fine with a 550w PSU you won't fry it lol
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post #1558 of 4140
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@nX3NTY

Im curious if you might be able to run 1900mhz memory @ 1500mhz timings? If you feel like trying it out id be interested to see if you can and how it effects memory bandwidth for you. I wonder if its just a difference in how Hynix vs Samsung memory is or its just that the 1500mhz timings are substantially tighter than 1625mhz +
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post #1559 of 4140
Quote:
Originally Posted by Echoa View Post

@nX3NTY

Im curious if you might be able to run 1900mhz memory @ 1500mhz timings? If you feel like trying it out id be interested to see if you can and how it effects memory bandwidth for you. I wonder if its just a difference in how Hynix vs Samsung memory is or its just that the 1500mhz timings are substantially tighter than 1625mhz +
Here's my 1500 timing on 2000MHz clock. It worked with 1500MHz timing now I don't know why. Game not lock up like before. Weird



For comparison sake, here's 3DMark Fire Strike with core clocked at 1300MHz 1050mV and same 2000MHz memory clock

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post #1560 of 4140
Thread Starter 
Quote:
Originally Posted by nX3NTY View Post

Here's my 1500 timing on 2000MHz clock. It worked with 1500MHz timing now I don't know why. Game not lock up like before. Weird



For comparison sake, here's 3DMark Fire Strike with core clocked at 1300MHz 1050mV and same 2000MHz memory clock


Wow that's a good 20gb/s increase just dropping the timing to 1500mhz strap and nearly 2 fps gain for firestrike. If you can then push the clock up and try and get 240gb/s you'll have the same bandwidth as a 290x in Oclmembench.
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