post #1 of 1
Thread Starter 
I finally got my second 7950 to crossfire and when I first tried the duo out, I got horrible color banding and flickering. I tried Windows 7, Windows 8, drivers from Win Update, latest 14.4 leaked press driver and same mess. Since both cards checked out individually, I started tinkering with the driver settings.

The solution was simple, though it took me a good while to find it:



yCbCr 4:2:2 is what my monitor looks best with (a 32" HDTV"). But that also makes a mess of crossfire. If I changed it back to the default of 4:4:4, all is well. Unfortunately for me and my TV, there is a slight quality degradation when feeding it the 4:4:4 color pixel format, but at least crossfire is beautiful and fluid.

I'm going to go out on a limb and say the driver only changes the pixel format on the primary card, while the second one keeps feeding 4:4:4, resulting in the ugliness I encountered.
RYZEN
(14 items)
 
OFFICE PC
(12 items)
 
20TB_HOMENAS
(9 items)
 
CPUMotherboardGraphicsRAM
AMD Ryzen 7 1700X ASRock Fatal1ty X370 Professional Gaming Crossfire XFX Core Radeon R9 390X 8GB D5  Corsair Vengeance LPX 64GB DDR4 CMK64GX4M4A2400C16 
Hard DriveOptical DriveCoolingOS
A bunch of swappable SSDs LG BD-ROM Thermaltake CL-P039-AL12BL-A Contac Silent Windows 7 for Work, Windows 10 for Games 
MonitorKeyboardPowerCase
Korean 32" 4K 324K Generic mechanical rainbow LED lit eVGA 850 G2 AZZA Helios 910 CSAZ-910 
MouseAudio
Logitech G500 T1 24BIT Tube USB DAC 
CPUMotherboardGraphicsRAM
AMD Athlon II X2 255 ASRock 970DE3/U3S3 Radeon X300 Kingston KHX1600C9D3/4GX 
Hard DriveHard DriveHard DriveHard Drive
8x Samsung HD204UI 7x Seagate ST2000DM001 Transcend TS16GSSD25-S 2x WD WD40EZRX 
Case
AZZA Helios 
  hide details  
Reply
RYZEN
(14 items)
 
OFFICE PC
(12 items)
 
20TB_HOMENAS
(9 items)
 
CPUMotherboardGraphicsRAM
AMD Ryzen 7 1700X ASRock Fatal1ty X370 Professional Gaming Crossfire XFX Core Radeon R9 390X 8GB D5  Corsair Vengeance LPX 64GB DDR4 CMK64GX4M4A2400C16 
Hard DriveOptical DriveCoolingOS
A bunch of swappable SSDs LG BD-ROM Thermaltake CL-P039-AL12BL-A Contac Silent Windows 7 for Work, Windows 10 for Games 
MonitorKeyboardPowerCase
Korean 32" 4K 324K Generic mechanical rainbow LED lit eVGA 850 G2 AZZA Helios 910 CSAZ-910 
MouseAudio
Logitech G500 T1 24BIT Tube USB DAC 
CPUMotherboardGraphicsRAM
AMD Athlon II X2 255 ASRock 970DE3/U3S3 Radeon X300 Kingston KHX1600C9D3/4GX 
Hard DriveHard DriveHard DriveHard Drive
8x Samsung HD204UI 7x Seagate ST2000DM001 Transcend TS16GSSD25-S 2x WD WD40EZRX 
Case
AZZA Helios 
  hide details  
Reply