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Ati x1950 and 22 inch digital lcd's

post #1 of 4
Thread Starter 
So I purchased a 22 inch samsung lcd wide screen, hooked it up tp my
x1950/x1900 crossfire setup using the digital cable. Installed the drivers for the monitor. Everything looked good. Played a few games seemed to be working fine.

Then I went to overclock my cards using atitool, and got black screen when I tried to set the clocks, thought that was wierd so I rebooted tried to set clocks on slave card first, and again black screen. So I reinstalled the ati drivers. Black screen again. So I reinstalled atitool, set voltages and went to apply them and black screen, so Ive narrowed it down to voltages on the cards.

So I slowly started increasing voltages until I could duplicte the black screen and as I was increasing them I noticed around 1.35v core it would flicker black screen, but could see enough long enough to lower the voltage and stop it flickering.

So I installed the monitor with the analog cable installed drivers for analog. Set my usual voltages for atitool 1.5v and overclocked no problem. Played games for hours and no problem.

Does running digital singnal from crossfire cards require more power or require less voltage on the cards? This really stumped me.

Resolution is 1680x1050 native tried other resolutions with the digital cable and same problem.
 
Blackmamba
(13 items)
 
 
CPUMotherboardGraphicsRAM
AMD Athlon 64 X2 4800+ socket 939 CPU 2.4 GHz T... ASUS A8R32-MVP Deluxe 939 ATI CrossFire Radeon ... x1950/X1900xtx@762/1.7/2.2 Crossfire 2x1GB OCZ EL DDR400@496 
Hard DriveOptical DriveOSMonitor
2xRaptor74GB/ext 320gb usb Samsung dvd/r Windows XP pro 22'' BenQfp222 
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Blackmamba
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AMD Athlon 64 X2 4800+ socket 939 CPU 2.4 GHz T... ASUS A8R32-MVP Deluxe 939 ATI CrossFire Radeon ... x1950/X1900xtx@762/1.7/2.2 Crossfire 2x1GB OCZ EL DDR400@496 
Hard DriveOptical DriveOSMonitor
2xRaptor74GB/ext 320gb usb Samsung dvd/r Windows XP pro 22'' BenQfp222 
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post #2 of 4
Thats something odd you have come across. I would perhaps change he way in which your CF setup transmits its signal to the screen as i know there are different Methods in which the two cards render pixels.
post #3 of 4
Quote:
Originally Posted by Fierceleaf View Post
So I purchased a 22 inch samsung lcd wide screen, hooked it up tp my
x1950/x1900 crossfire setup using the digital cable. Installed the drivers for the monitor. Everything looked good. Played a few games seemed to be working fine.

Then I went to overclock my cards using atitool, and got black screen when I tried to set the clocks, thought that was wierd so I rebooted tried to set clocks on slave card first, and again black screen. So I reinstalled the ati drivers. Black screen again. So I reinstalled atitool, set voltages and went to apply them and black screen, so Ive narrowed it down to voltages on the cards.

So I slowly started increasing voltages until I could duplicte the black screen and as I was increasing them I noticed around 1.35v core it would flicker black screen, but could see enough long enough to lower the voltage and stop it flickering.

So I installed the monitor with the analog cable installed drivers for analog. Set my usual voltages for atitool 1.5v and overclocked no problem. Played games for hours and no problem.

Does running digital singnal from crossfire cards require more power or require less voltage on the cards? This really stumped me.

Resolution is 1680x1050 native tried other resolutions with the digital cable and same problem.
After all the testing you have done.
I would say "YES" to the higher voltage.
I have not heard of this problem before, have you talked to the mfg of your screen to get what they recommend on this subject?
My Thang
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WD SE16 500gb SATA3 Pioneer DVR108 Win XP Pro SP2 Samsung 22" WS LCD 
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My Thang
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Athlon X2-4400 w/CNPS9500 Led DFI LP UT CFX3200 DR/G HD3850 512 CCC 8.5 x2 2x1gb OCZ Platinum 
Hard DriveOptical DriveOSMonitor
WD SE16 500gb SATA3 Pioneer DVR108 Win XP Pro SP2 Samsung 22" WS LCD 
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Logitech Wireless Laser OCZ GameXStream 700 Watt Thermaltake Tsunami Logitech MX600 Laser 
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post #4 of 4
Thread Starter 
Thats the weird thing the more voltage I give the card, as in going past 1.375volts, produces the black screen flickers the higher the voltage the worse the flicker. If I go to 1.5 volts at which the cards usually operate the black screen is solid. Lowering the volts stops the problem.

Ive even tried to disable crossfire an just enable a single card and still happening but only with the digital cable.

Enterprise, how would I change the way crossfire transmits its signal, I've never heard about this.

I would say the cards are at fault if this happened with analog too.

My only guess is that the monitor I purchased is 1680x1050 native resolution.
And crossfire only supports 1600x1200 max resolution with digital, so even when I try different resolution on the monitor (1200x1024, and so fourth) its encountering some problem and loses signal.

Anyway I'm returning the monitor tommorow, it has some exteremly bad backlight bleeding, see if another monitor works. If not Ill be sending emails to Ati and samsung.
 
Blackmamba
(13 items)
 
 
CPUMotherboardGraphicsRAM
AMD Athlon 64 X2 4800+ socket 939 CPU 2.4 GHz T... ASUS A8R32-MVP Deluxe 939 ATI CrossFire Radeon ... x1950/X1900xtx@762/1.7/2.2 Crossfire 2x1GB OCZ EL DDR400@496 
Hard DriveOptical DriveOSMonitor
2xRaptor74GB/ext 320gb usb Samsung dvd/r Windows XP pro 22'' BenQfp222 
KeyboardPowerCaseMouse
Z-board 620w Corsair DD Torture Rack Microsoft 
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Desktop 
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Blackmamba
(13 items)
 
 
CPUMotherboardGraphicsRAM
AMD Athlon 64 X2 4800+ socket 939 CPU 2.4 GHz T... ASUS A8R32-MVP Deluxe 939 ATI CrossFire Radeon ... x1950/X1900xtx@762/1.7/2.2 Crossfire 2x1GB OCZ EL DDR400@496 
Hard DriveOptical DriveOSMonitor
2xRaptor74GB/ext 320gb usb Samsung dvd/r Windows XP pro 22'' BenQfp222 
KeyboardPowerCaseMouse
Z-board 620w Corsair DD Torture Rack Microsoft 
Mouse Pad
Desktop 
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