Graphics Cards

[panyamin]

Hello,

I've 2 Vega 64 cards (Specs says : Sapphire Nitro+ Vega 64 @1580mhz + Asus Strix Vega 64 OC @1590mhz).
When enabling crossfire/mgpu on games that works with, both cards are overclocked to 1670mhz..! Is this a normal behaviour ?

All games I've tested have stuttering, worst performance, hang, freeze, or crash...

Even when I limit power to -10%, cards still overclock a little mhz..

What i'm doing wrong ?

Thanks !

My RIG:
i5-8600k @ 4.7 Ghz
Asus Z370
16 Gb DDR4 @ 3200Mhz
Corsair HX850i @ 850W
Win 10 Pro (1809)
AMD Drivers 18.12.1.1

[goodplay]

Aside from mismatched clock speeds/bios settings/underpowered psu, maybe the windows supplied driver(not AMD direct driver) might be suspect.

[panyamin]

All bios are default ones, I've also tested everything under full load and all went good:

• Sapphire card maxed to 240W
• Asus card maxed to 260W
• Total system maxed to 720W

Where have you seen the widows supplied driver ?
Note that I've cleaned drivers with DDU.

Thanks!

[goodplay]

DCH/UWD in your gpu-z pic.

I haven't read up about it myself(yet).

What OC apps are you using, does it happen if you tested each card on its own.

Have you asked asus/sapphire support about it.

[panyamin]

DCH/UWD is the new drivers structure in Win 10. And AMD Drivers support this.

I'm not using any OC apps, the only OC I've made is for the CPU from the UEFI Bios.

Each card works on its own, no hang, no freeze, no crash...

It's only when using crossfire on games, clocks goes very high the exact same way...
It didn't happen when using Furmark, 3DMark and other tools.

Are the clocks synchronize on each other cards when using crossfire by design ?

[goodplay]

May be better to contact AMD, see what they have to say https://support.amd.com/en-us/contact/email-form