Half-Life 2 terrrain blinks constantly

I have an ATI Radeon HD 4870 X2 and I try playing Half-life 2 on this computer. When I play HL2, the terrain, especially water, blinks constantly. This happens in mods also.

I've tried updating my drivers, and I have the most current version, but this doesn't fix the problem. I've also tried turning all my graphics to the lowest settings, which doesn't work either. Any suggestions?
OpacityZeroAsked:
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knoxzooConnect With a Mentor Commented:
Having the X2 card is a bit tricky.  In some BIOS', you have to turn on Crossfire.  In others, you don't.  It depends on how the BIOS sees the card.  It's kinda like the Western Digital hard drives, where on some systems you leave the jumper off when it's a single drive, like WD recommends, and on others, you have to jumper it for Master or Cable Select.  Your card falls into one of those many shades of gray areas.  

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netskyb0Commented:
Try to disable, if possible from the game settings Twxture and Lighting and check Antialias settings.

If possible try also check settings of your videocard from windows and see if you can disable or enable some "hardware capabilities emulation".

Let me know...
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knoxzooCommented:
Try enabling Crossfire in your computer's BIOS/CMOS.

Otherwise, sounds like you managed to lay hands on a bad ATI card.  

Try going through ATI's (AMD's) support system and knowledge base.  But, I wouldn't be at all surprised if they told you to warranty the card.
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OpacityZeroAuthor Commented:
Alright, will do
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OpacityZeroAuthor Commented:
knoxzoo: Can I turn Cross Fire on while only 1 card is connected?

I actually got it to work once yesterday when I unchecked "use application settings" in the ati control panel. But once I closed the game, I went into the game again without changing any video settings and I had the same problem.
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OpacityZeroAuthor Commented:
I updated my bios and that seemed to fix the issue. I'm going to keep testing it
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knoxzooConnect With a Mentor Commented:
Cool!  That means they've added support for the double cards in the BIOS, killing off the guess work involved.  
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