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7950 Vapor X Voltage Locked? - Page 41

post #401 of 1056
I wont be taking the heatsink off, but I can tell you that my PCB is exactly the same as the one here:
http://www.overclockersclub.com/reviews/sapphire_7950_vaporx/2.htm
which apparently means a 7970 PCB. The V09, V0A bios would also suggest this, as it's only available for this version.

The older version is pictured here, some differences are visible on the back of the PCB, without removing the heatsink:
http://www.kitguru.net/components/graphic-cards/zardon/sapphire-hd7950-vapor-x-edition-review/3/

As to my reported OC results:
After some more testing with anti-aliasing enabled I had to settle with lower memory clocks. In the end I'm running a stable 1000/1700 with BIOS1 and 1100/1700 with BIOS2.
Furmark VRM temperatures peak at 99C and 108C respectively after prolonged testing. Stays around or below 80C in normal use.

Edit:

I've just discovered the modded version of Sapphire Trixx 4.0.4b.
Core voltage unfortunately stays locked, but memory voltage adjustment works fine.

New memory overclock with MVDDC @ 1.625 - 1950MHz. Wow, just wow :-).
Edited by glina - 12/11/12 at 3:50pm
post #402 of 1056
That's some crazy memory overclock, Glina.
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post #403 of 1056
Quote:
Originally Posted by glina View Post

I wont be taking the heatsink off, but I can tell you that my PCB is exactly the same as the one here:
http://www.overclockersclub.com/reviews/sapphire_7950_vaporx/2.htm
which apparently means a 7970 PCB.

That is not a reference HD7970 PCB. It is a custom PCB for the HD7950. Looks very powerful.
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post #404 of 1056
It appear to be the same pcb than the 7970 Vapor X one actually :
http://www.overclockersclub.com/reviews/sapphire_hd7970_vaporx_ghz/2.htm

I did get the same one, but mine did come with the V03/V04 bioses, had to update them to V0A/V09 cause of the very hot VRM1 temp.

It is voltage locked, even with TriXX 4.4.0b, I'm no feeling to try force constant voltage with AB.

Edited : Okay I just tried again with the stock bioses (V03/V04) and I can confirm it is not voltage locked in TriXX.
Edited by Light Phaser - 12/15/12 at 7:39am
post #405 of 1056
I tried forcing a constant voltage with AB, but didn't work for me. The screen (in 2D) would start jumping (a bit like lost of sync in analog era) and the clocks could not be pushed any further.

What is your max overclock with V0A bios?
post #406 of 1056
Max stable overclock I get with V0A bios is 1100/1700.

Sadly even if I can change the voltage with V03/V04 bioses, it seems to go back to stock voltage if I apply a positive powerplay, leaving a 0% powerplay make the frequencies throttling like crazy.

I'm pretty sure someone here encountered the same behavior, but I'm too lazy to find that post.
post #407 of 1056
Quote:
Originally Posted by Light Phaser View Post

It appear to be the same pcb than the 7970 Vapor X one actually :
http://www.overclockersclub.com/reviews/sapphire_hd7970_vaporx_ghz/2.htm

Both of these are not reference HD7970 design. Not that they are a poor design. Look very powerful but if you want to water cool them a reference design HD7970 water block will not work on either of them.
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B.K.T.
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post #408 of 1056
Quote:
Originally Posted by glina View Post

I wont be taking the heatsink off, but I can tell you that my PCB is exactly the same as the one here:
http://www.overclockersclub.com/reviews/sapphire_7950_vaporx/2.htm
which apparently means a 7970 PCB. The V09, V0A bios would also suggest this, as it's only available for this version.
The older version is pictured here, some differences are visible on the back of the PCB, without removing the heatsink:
http://www.kitguru.net/components/graphic-cards/zardon/sapphire-hd7950-vapor-x-edition-review/3/
As to my reported OC results:
After some more testing with anti-aliasing enabled I had to settle with lower memory clocks. In the end I'm running a stable 1000/1700 with BIOS1 and 1100/1700 with BIOS2.
Furmark VRM temperatures peak at 99C and 108C respectively after prolonged testing. Stays around or below 80C in normal use.
Edit:
I've just discovered the modded version of Sapphire Trixx 4.0.4b.
Core voltage unfortunately stays locked, but memory voltage adjustment works fine.
New memory overclock with MVDDC @ 1.625 - 1950MHz. Wow, just wow :-).

Wow, nice memory OC. I'm unable to OC any further by overvolting my memory.

@ 1550mv -> 1700
@ 1600 -> 1800
@ 1625 -> 1800 but unstable. :[
post #409 of 1056
Hi guys

first post on this thread here

I got hold of a sapphire 7950 with boost (non flex / non vaporX) the one with the green marine girl
has no bios boost button on the board but it has a boost function from bios (850 up to 925 memory stays the same 1250)

data is:
sku 11196-16-20G
pn 299-1E207-300SA

bios as stated by gpuz is 015.023.000.001.000000 113-1E207200P2-S4C

never saw this bios reference or sku number posted here before

seems I have voltage control unlocked becuase if I change it remains there

I tried trixx on 1100 gpu clock, 1325 memory, board power li 20% and lowered the vddc to 1200
with a not to agressive fan profile (60% at 70ºc, 80% at 80ºc) it´s stable at 72-73ºc

- does this looks good ?
- any clue on this board/bios version ?
- are these supposed to be elpida or hynix rams ? (my guess is elpida because of the lettering but not sure)
post #410 of 1056
Good to hear your card is unlocked.

Your temperatures look high, but so does your Vcore. It's probably too high for 1100MHz as many cards can reach that on stock volts.

Power is in square relation to voltage, so at 1.2V , the chip consumes roughly 28% more power comparing to the typical stock voltage of 1.06V ((1.2*1.2)/(1.06*1.06) = 1.28)

I would suggest you go down with the voltage until you find the stable limit, and then add a tiny bit for safety. This will be a good starting point for more OC of the core.

Overclock your memory separately to find it's limit. If you can exceed 1500MHz, you probably got Hynix chips. If you want to overclock higher, you may also up the memory voltage (look for Trixx 4.4.0 mod version to enable MVDCC adjustment). It's generally safe to go up to 1.6-1.65V. Don't worry if you can't break 1500MHz as there is very little gain with higher clocks.

Also watch your VRM temperatures in GPU-Z as they are usually higher than core temps.
110C is considered the safe limit for VRMs, but most people recommend not to exceed 90C in normal use which is a reasonable compromise.

Test your tempeatures in Furmark, and stability in Heaven (all settings on max) + 3D Mark 11 (my card hates the second graphics test).
Edited by glina - 12/20/12 at 5:44am
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