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post #5201 of 11573
Figured out 100mv differance in voltage between cards, the ground was not making a secure connection in my pcb terminal clamp, all seems good now.

I reproduced 1200 core OC on the second card @ 1.33V and 1.36V Hbm. It looks like this card likes less voltage for the same OC. Tested in 3Dmark with no artifacts or black lost frames.

It can do 630Mhz hbm, I am in process testing 1200 core and 630 hbm combined for each card and then will experiment with crossfire.
post #5202 of 11573
Quote:
Originally Posted by Otterfluff View Post

Figured out 100mv differance in voltage between cards, the ground was not making a secure connection in my pcb terminal clamp, all seems good now.

I reproduced 1200 core OC on the second card @ 1.33V and 1.36V Hbm. It looks like this card likes less voltage for the same OC. Tested in 3Dmark with no artifacts or black lost frames.

It can do 630Mhz hbm, I am in process testing 1200 core and 630 hbm combined for each card and then will experiment with crossfire.

Sweet! Have you tried 1.4V on core? Also does HBM voltage actually help with anything?
post #5203 of 11573
Quote:
Originally Posted by buildzoid View Post

Sweet! Have you tried 1.4V on core? Also does HBM voltage actually help with anything?

I havent tested 1.4V yet as if I put voltage too high for the core clock I get crashes. After I finish trying to get both cards on 1200 630 stable crossfire I will try higher core clocks/voltage.

I am now trying out 1.4V HBM and it seems to like it. Especially good at making the particle effects at the last test of Fire Strike Ultra not deform.

The second card is at 1.33V 1200Mhz core and 630Mhz 1.4V hbm right now and I think I have it stable. But this second card is alot more fussy than the first that likes 1.6-1.7V core. The first card takes more voltage but seems to have more room to move around to get it stable.
post #5204 of 11573
Quote:
Originally Posted by Otterfluff View Post

I havent tested 1.4V yet as if I put voltage too high for the core clock I get crashes. After I finish trying to get both cards on 1200 630 stable crossfire I will try higher core clocks/voltage.

I am now trying out 1.4V HBM and it seems to like it. Especially good at making the particle effects at the last test of Fire Strike Ultra not deform.

The second card is at 1.33V 1200Mhz core and 630Mhz 1.4V hbm right now and I think I have it stable. But this second card is alot more fussy than the first that likes 1.6-1.7V core. The first card takes more voltage but seems to have more room to move around to get it stable.

Hmm sounds like a cap mod might help get better Vcore scaling. Though 6 phases really should be pretty clean.
post #5205 of 11573
Quote:
Originally Posted by kayan View Post


Yeah, I have a personal ban against most Asus stuff anyway. I won't buy them unless necessary. For AMD GPUs it's XFX, Visiontek, or Sapphire.

Anyway, are the XFX and Sapphire Fury stock pcb or are they custom?
My xfx is definitely reference, but Cu's are hard locked...
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Daddy's Gamer
(15 items)
 
Son's Gamer
(13 items)
 
PROJECT WIFEY
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CPUMotherboardGraphicsRAM
FX-9590 @ 5GHz Asus 990FX Sabertooth Rev 2.0 MSI Gaming 390X G. Skill Trident X 4x4GB  
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post #5206 of 11573
Quote:
Originally Posted by Otterfluff View Post

I havent tested 1.4V yet as if I put voltage too high for the core clock I get crashes. After I finish trying to get both cards on 1200 630 stable crossfire I will try higher core clocks/voltage.

I am now trying out 1.4V HBM and it seems to like it. Especially good at making the particle effects at the last test of Fire Strike Ultra not deform.

The second card is at 1.33V 1200Mhz core and 630Mhz 1.4V hbm right now and I think I have it stable. But this second card is alot more fussy than the first that likes 1.6-1.7V core. The first card takes more voltage but seems to have more room to move around to get it stable.

Your results are looking really good. This is showing to be a nice card. Will be very interesting to see what kind of scores at these settings. Looking forward to your updates.

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post #5207 of 11573
Ok so after alot of testing this is what I have got.

My first card can do 1200Mhz 1.36-1.37V core 630Mhz 1.4V HBM fully stable as a single card with no artifacts.

My second card can do 1150Mhz 1.28V core 630Mhz 1.4V HBM fully stable as a single card with no artifacts.

I cant keep the first card at 1200 under crossfire. I have successfully been running crossfire with both cards at 1150Mhz @ 1.32V other card 1.28V core and 630Mhz 1.4V HBM for both.

This has been tested under 3Dmark and Witcher 3.

I found I could not crossfire with stock HBM voltage the OC was unstable and had severe artifacts. After raising the voltage those artifacts disappeared.

I did try voltages up to 1.42V on the first card but I was un-successful at raising the clock above 1200Mhz. Even 1220Mhz was just plain unstable for me no matter what I tried to do. But I can get 1200Mhz on it easily within a margin of 300mv.

I will try screwing around with raising the core clocks on both under crossfire, but I honestly doubt I can do better than say 1200 on the first card and 1170 on the second.

There is a wall for HBM overclocks at 630Mhz, it dose not seem to be effected by anything it's just there. I did notice with more voltage the artifacts after 630Mhz diminishes but does not disappear completely, but you would need more than 1.4V if thats even safe? The artifacts are white dots that slowly cover the screen, this is done inside windows as soon as you set the HBM above 630Mhz, it ends up with windows locking up shortly after.

Right now I consider 1150 and the 630 HBM overclock to be solid in crossfire for playing games without any worries.
Edited by Otterfluff - 11/9/15 at 7:45pm
post #5208 of 11573
Quote:
Originally Posted by Otterfluff View Post

Right now I consider 1150 and the 630 HBM overclock to be solid in crossfire for playing games without any worries.

I can play at ~1140MHz and ~570MHz without a volt mod (however, I have not tested this in Crossfire).
post #5209 of 11573
Quote:
Originally Posted by Neon Lights View Post

I can play at ~1140MHz and ~570MHz without a volt mod (however, I have not tested this in Crossfire).

That card could probably do 1200mhz+ on voltage.
post #5210 of 11573
Quote:
Originally Posted by buildzoid View Post

That card could probably do 1200mhz+ on voltage.

Well, I hope it will.

I am not planning to do a hard voltage mod, I am really looking forward to a soft one (via BIOS). What did I buy those waterblocks for if I have to keep the cards at stock voltage?
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