Crossfire Freezing, Help!

[WicketWarrick]

Hi All.

 

I am hoping someone else has had this issue and can help.  I am stuck!  This is going to be long, but I am going to try to be thorough.

 

The Issue:

When adding a 2nd MSI Gaming X RX 480 8GB card to my system, I am experiencing crashes.  This happens sometimes when trying to start a game, and sometimes (so far) after 1 game of Rocket League, when trying to go to the second game.  The freezes are odd, I've never seen them before.  It is not a BSOD or a flat shutdown, but a slow blinking screen of boxy, pixelated colors until the computer restarts.  When this happens when trying to start a game, the screen just very slowly flashes black and then completely white.  It has pointed to a memory, bad card, bad PCI, or power issue to me.  As noted below I haven't been able to confirm any of this yet.

 

What I've Tried and Discovered:

I have pulled and reseated the cards, I have tested them individually and they both work fine, I've updated my BIOS, I've tested my memory, I've run 3D Mark with cards in crossfire with no issues, I've confirmed Crossfire is on in MSI's software and the logo comes up when I get a working game of Rocket League going.  I have a 750 platinum PSU and per some internet research, this should be plenty for my configuration.  I have made sure all BIOS settings and clocks to stock.  As of now, I only have 1 card in and I'm back to running fine.

 

What I'm working with:

EVGA SuperNOVA 750 P2 220-P2-0750-X1 80+ PLATINUM 750W

MSI Gaming Z170A GAMING M5 LGA 1151

Intel Core i5-6600K 6M Skylake Quad-Core 3.5 GHz LGA 1151 91W

(Attempted 2) MSI GAMING RX 480 GDDR5 8GB

Corsair Vengeance 16GB (2x8GB) DDR4 3200 (PC4-25600)

 

I have read all about the power draw issues, but the MSI Gaming X card has an 8 pin and it sounds like 750 watts should be plenty for this setup.  FYI, full system and calculated power supply needs from Cooler Master's website are attached in pic form.

 

HELP?!

[Gonio]

It's dual GPU. Stuff like that happens. Try completely uninstall drivers and do a fresh install. Could also be the games you try have bad support. Also do you run them OCed? If yes, try it stock settings.

[WicketWarrick]

Gonio, sorry, I forgot to mention I tried that already.  Removed all drivers and reinstalled.  That did get me from the game not working to it crashing after 1 game.  I know multiple people running Crossfire and playing Rocket League fine Everything in the system is stock clocked.

[Gonio]

Did that with DDU? Because it's sometimes not entirly removed...

[WicketWarrick]

I used AMD's cleaner, do you think DDU would work differently/better?

[Gonio]

Could be worth it. Not sure how good the AMD stuff works these days. In the past it wasn't the most clean uninstall imo, but didn't have to use it recently.