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Polaris Bios Editing ( RX5xx / RX4xx ) - Page 137

post #1361 of 3354
So, any idea on how to edit real memory voltage? And also, I was wondering : would it be possible to add power states for ram via hex editing? If I remember right I read it was possible with some older AMD gpus.
post #1362 of 3354
I used this timing for 2000 strap:

555000000000000022CC1C00AD615A41C0570E15B00B450A0068C7000B031420FA8900A003000000190F2F39B22D3517

and this is what I'm getting in AIDA64:

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post #1363 of 3354
Quote:
Originally Posted by robnitro View Post

From what I remember in the stilt modding of 7950/7970 timings, the memory copy is most important stress test.

Even if you have no errors in hwinfo reported, by memory copy you can see if the internal error correction slows down your memory speed when stressed.

So a faster timing that passes, might be worse than a slower timing that makes the IMC/memory have less internal "corrections".

Generalemon:

Why did you go from

555000000000000022CC1C00AD615A41C0570E152DCB74090068C7000B031420FA8900A0030000001E123A46DB354019

to

777000000000000022CC1C00AD615B41C0570E152DCB74090068C7000B031420FA8900A0030000001E123A46DB354019

Interesting that the 777 555 does no change in tests. Not sure what it does..

I would think a higher B over A would be slower timing. I'm using the "A41" timing for now with 938mv memory in bios (IMC- correct?) and 938 mem in wattman.
MemtestCL reports errors way before you get any EDC in HWInfo to show up.
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post #1364 of 3354
hi i think my rx470 might have 8gb vram as well because of this pic:



vram temps during witcher 3 on 1440p, the difference between the two makes me think i might have 8gb vram in 4gb model, am i right to think so?
post #1365 of 3354
Quote:
Originally Posted by Torvi View Post

hi i think my rx470 might have 8gb vram as well because of this pic:



vram temps during witcher 3 on 1440p, the difference between the two makes me think i might have 8gb vram in 4gb model, am i right to think so?

Those are not vram temps, those are VRM aka Voltage regulator module temps. And im pretty sure that the VRM temp 2 is bugged or a error since it seems to allways be 26ºC in all cards..
post #1366 of 3354
Quote:
Originally Posted by Loladinas View Post

MemtestCL reports errors way before you get any EDC in HWInfo to show up.

Yeah from what I heard about, sometimes the imc internally corrects an error by using ecc calculation which shows up as ok in a program, and also doesn't show up in hwinfo.

Because that error checking takes an extra read or something, it shows up as a slower bench. This was from stilt explaining to the miners how to find the best strap for 7950/70/280 cards. I think it could be the same today
post #1367 of 3354
Quote:
Originally Posted by SAMiN View Post

I used this timing for 2000 strap:

555000000000000022CC1C00AD615A41C0570E15B00B450A0068C7000B031420FA8900A003000000190F2F39B22D3517

and this is what I'm getting in AIDA64:


How could you increase read & write speed ? I'm stuck at 6200mb/s and 5800mb/s... Which timing to change ?
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post #1368 of 3354
Quote:
Originally Posted by ekoaja View Post

How could you increase read & write speed ? I'm stuck at 6200mb/s and 5800mb/s... Which timing to change ?
It's odd with read and write, with the 7950, some got high like that, others low. What matters is the copy speed. I think the read and write depends on pcie speed and cpu busses speed and latency. Copy is internal on gpu memory bus only.

I have sandy bridge i5 2500k @4.6ghz and cl9 1866 ddr3 ram with pcie 2.0 x16
I get
6322 read
6358 write
202988 copy. (2010mhz vram and generalemon's latest timings)
Edited by robnitro - 2/25/17 at 10:28pm
post #1369 of 3354
Thread Starter 
Memory read / write / copy is the speed of the gpu vram seen from the cpu (from what i see). To read and write in the gpu memory you must go through the pcie ( 2.0 8GB/s / 3.0 16GB/s)...but if you copy, data remain in the gpu.
post #1370 of 3354
Quote:
Originally Posted by robnitro View Post

It's odd with read and write, with the 7950, some got high like that, others low. What matters is the copy speed. I think the read and write depends on pcie speed and cpu busses speed and latency. Copy is internal on gpu memory bus only.

I have sandy bridge i5 2500k @4.6ghz and cl9 1866 ddr3 ram with pcie 2.0 x16
I get
6322 read
6358 write
202988 copy. (2010mhz vram and generalemon's latest timings)

You're seeing the speed of your cpu/PCIE bus, copy is local on GPU but read/write involves the cpu/PCIE bus. You're fine nothing to worry about.
Edited by Echoa - 2/25/17 at 11:33pm
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