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[Official] AMD R9 280X / 280 & 270X / 270 Owners Club - Page 534

post #5331 of 9745
Quote:
Originally Posted by Arkanon View Post

I suppose you have voltage control in AB? What i did was simply unlock the voltage control in AB (1300mv), after that i installed HIS iTurbo and maxed out the voltage slider there as well. I suspect that both the programs each add about 100mv extra to the card, allthough i can't confirm that actually got me to the 1.4 ish volts on the card. Would be nice if someone else tried to reproduce the same steps i did and see if it works for their cards as well.


I installed AB (newest beta) and enabled:

 

  1. Hardware Control & Monitoring
  2. Low-Level Hardware Access Interface
  3. Unlock Voltage Control - Reference/Standard MSI/Extended MSI
  4. Unlock Voltage Monitoring
  5. Extend Official Overclocking Limits
  6. Disable ULPS
  7. Unofficial Overclocking Mode - With/Without PowerPlay Support

 

No combination allowed to increase the voltage any further than 1318; which I got from HIS iTurbo previously.  No Matter what I did AB does not allow me to adjust voltage, the slider is still grayed out.

 

1318mV is now available in Trixx, where it was previously capped at 1300.

 

Maybe if I flash to MSI BIOS?


Edited by Roboyto - 4/14/14 at 10:11pm
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post #5332 of 9745
Quote:
Originally Posted by GuestVeea View Post

Are you using Beta drivers with Mantle, or directx?

in those i was using

CCC 14.3 DirectX

bp3.png
cvkrz9.png

but later on i switched to Mantle and was getting better FPS

between 100 and 160 FPS with mantle on metro and locker....

im trying OBS to record but quality blows in the end....
Edited by eAT5 - 4/14/14 at 10:40pm
post #5333 of 9745
Quote:
Originally Posted by Roboyto View Post


I installed AB (newest beta) and enabled:
  1. Hardware Control & Monitoring
  2. Low-Level Hardware Access Interface
  3. Unlock Voltage Control - Reference/Standard MSI/Extended MSI
  4. Unlock Voltage Monitoring
  5. Extend Official Overclocking Limits
  6. Disable ULPS
  7. Unofficial Overclocking Mode - With/Without PowerPlay Support

No combination allowed to increase the voltage any further than 1318; which I got from HIS iTurbo previously.  No Matter what I did AB does not allow me to adjust voltage, the slider is still grayed out.

1318mV is now available in Trixx, where it was previously capped at 1300.

Maybe if I flash to MSI BIOS?

Have you tried by unchecking low-level hardware access interface ?
I need to run AB with it unchecked otherwise i have no voltage control either.
I strongly doubt my card is a one off or 'faulty' for that matter so i do strongly believe it's all in the settings.
post #5334 of 9745
Quote:
Originally Posted by GuestVeea View Post

Are you using Beta drivers with Mantle, or directx?

Sorry I do not mean to be coming off as mean.

If someone takes a screenshot of BF4 with FPS reporting on the bottom left (bf4 fps draw is on top right) and you ask a question if that person is using Directx, mantle. You should know hes using DirectX because far as I know, no screenshot 3d application supports mantle and if it does, it doesn't take it correctly (Please correct me if I'm wrong)

When I looked at his post, already knew it was DX only because you can see fraps reporting FPS on bottom left. Type in "screenshot.render" in console inside BF4 to take a screenshot of mantle smile.gif
Edited by Unknownm - 4/15/14 at 12:48am
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post #5335 of 9745
im gonna try 14.4 Mantle tonight....

post #5336 of 9745
So I've managed to get my card up to 1150/1600 at 1170v. Tops out around 70c now. Custom fan profile. Want to see if I can push the memory to 1700.

Only odd thing is. If the memory is anywhere above 1500 it does worse in Heaven benchmarks.

Yet a memory OC improved my FPS in Crysis 3 by about 2 (min and average). Did a multiple run through using fraps. This could still just be margin of error however.
post #5337 of 9745
Quote:
Originally Posted by Tobe404 View Post

So I've managed to get my card up to 1150/1600 at 1170v. Tops out around 70c now. Custom fan profile. Want to see if I can push the memory to 1700.

Only odd thing is. If the memory is anywhere above 1500 it does worse in Heaven benchmarks.

Yet a memory OC improved my FPS in Crysis 3 by about 2 (min and average). Did a multiple run through using fraps. This could still just be margin of error however.
Quote:
Since the latency can be decreased by increasing the clock frequency (lower time per cycle), it appears that the memory frequency itself has a major impact on the performance. However as long as the VBIOS is calibrated as it should, the performance is identical at 1250MHz (DDR-5000) and at 1500MHz (DDR-6000) for example.

When the VBIOS works properly the timings are adjusted by the memory controller based on presets defined by the VBIOS.
For example on 7970 card the VBIOS should contain timing presets for following clock regions:

400MHz (0-400MHz)
800MHz (401-800MHz)
900MHz (801-900MHz)
1000MHz (901-1000MHz)
1125MHz (1001-1125MHz)
1250MHz (1126-1250MHz)
1375MHz (1251-1375MHz)
1500MHz (1376-1500MHz)
1625MHz (1501-1625MHz)
1750MHz (1626-VCO Max)

So when the default memory clocks of a 7970 card is 1500MHz, the memory controller will drive timings defined by the 1500MHz clock profile (if present). As soon as the user sets the memory clock to 1501MHz (e.g.) the memory controller will start driving timings defined by the 1625MHz profile. The same thing happens if the clocks are lowered to 1375MHz for example.

Since the higher frequency profiles will usually have looser timings a slight increase in clock frequency might actually increase the memory latency instead of lowering it. For example at 1500MHz the GDDR5 timings for Hynix modules are 16-17-17 (tCL-tRCD-tRP, in MEMCLKs). This means that the actual cycle time is 10.66ns for tCL, 11.33ns for tRCD and tRP (1000 / 1500 * delay in MEMCLKs). For the 1625MHz clock profile the timings are 17-18-18. This means that if you overclock the memory from 1500MHz to 1550MHz the actual memory latency will increase while the bandwidth increases: 10.967ns for tCL and 11.612ns for tRCD and tRP. This is one of the reasons why overclocking the memory is not always desireable.

https://litecointalk.org/index.php?topic=12369.0
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post #5338 of 9745
Quote:
Originally Posted by Arkanon View Post


Have you tried by unchecking low-level hardware access interface ?
I need to run AB with it unchecked otherwise i have no voltage control either.
I strongly doubt my card is a one off or 'faulty' for that matter so i do strongly believe it's all in the settings.


No luck :thinking:

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post #5339 of 9745
Quote:
Originally Posted by Unknownm View Post

Since the latency can be decreased by increasing the clock frequency (lower time per cycle), it appears that the memory frequency itself has a major impact on the performance. However as long as the VBIOS is calibrated as it should, the performance is identical at 1250MHz (DDR-5000) and at 1500MHz (DDR-6000) for example.

When the VBIOS works properly the timings are adjusted by the memory controller based on presets defined by the VBIOS.
For example on 7970 card the VBIOS should contain timing presets for following clock regions:

400MHz (0-400MHz)
800MHz (401-800MHz)
900MHz (801-900MHz)
1000MHz (901-1000MHz)
1125MHz (1001-1125MHz)
1250MHz (1126-1250MHz)
1375MHz (1251-1375MHz)
1500MHz (1376-1500MHz)
1625MHz (1501-1625MHz)
1750MHz (1626-VCO Max)

So when the default memory clocks of a 7970 card is 1500MHz, the memory controller will drive timings defined by the 1500MHz clock profile (if present). As soon as the user sets the memory clock to 1501MHz (e.g.) the memory controller will start driving timings defined by the 1625MHz profile. The same thing happens if the clocks are lowered to 1375MHz for example.

Since the higher frequency profiles will usually have looser timings a slight increase in clock frequency might actually increase the memory latency instead of lowering it. For example at 1500MHz the GDDR5 timings for Hynix modules are 16-17-17 (tCL-tRCD-tRP, in MEMCLKs). This means that the actual cycle time is 10.66ns for tCL, 11.33ns for tRCD and tRP (1000 / 1500 * delay in MEMCLKs). For the 1625MHz clock profile the timings are 17-18-18. This means that if you overclock the memory from 1500MHz to 1550MHz the actual memory latency will increase while the bandwidth increases: 10.967ns for tCL and 11.612ns for tRCD and tRP. This is one of the reasons why overclocking the memory is not always desireable.

https://litecointalk.org/index.php?topic=12369.0

Nice! Thank you! +rep

I knew something fishy was happening every 250MHz....but didn't know why. Now I know!
post #5340 of 9745
So basically there is no point OCing memory on a current GPU then? Or am I still missing somehting?
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