Mac Pro 3,1 with ATI Radeon 5770 + 30" Apple Cinema Display Problem

Ok guys/gals,
First of all I apologize for the thread as there have been previous posts in the past referrencing various different questions and setups, but I have a problem.. It's a little bit of a noob question so sorry in advance BUT..
What is the correct way to set up the 30 inch with the 5770? I have an old 3,1 (early 2008) that I've upgraded with various hard disks, SSD and 12 gig RAM. I removed the stock Nvidia Card and replaced it with this one but I am having problems that cause the Mac to slow down and the display to go all "fuzzy" or have streaking greenish lines (which you can only see against a black backdrop).
Currently, i have it going into the DVI port with the USB and FW extensions just lying around.. I've read something about needing to source more power from the motherboard to power the display, but I am not sure what to do... It's hit or miss really... every time i want to play say Starcraft 2, i need to restart my Mac Pro else it gets extremely sluggish (graphics)...
Is my Mac dying? or am i not powering the 30 inch correctly? If not, then I am confused between display ports and dual power (active) mini display ports.. can someone please point me in the right direction?
Apols for the long note, but am pretty good with computers but this is just annoying the sh*t out of me and has been for a while...
(PS - I CANT WAIT FOR THE NEW MAC PRO !!!)
Thanks,
NK

@ Hatter
Yup prior card was 8800gt and new card is nice and snug. 10.8 was not clean install, was upgrade. Ill try safeboot although not sure how/why that will fix any long term issues i have (which are random).. Trying 10.7 i had the same issues and was hoping that 10.8 wld fix.. Why go back to 10.6.8 when it should work in todays day and age? :(
@ Grant
Have done that now although not sure why something like this is not in the owners manual?!
Thanks for the help/suggestions so far guys, much apprec.. Feels like my pro is dying on me slowly but surely...
Any other bright ideas?

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This is not an uncommon problem. It's often called dancing pixels or noise/static, so you can search the topic for more info.
Some ATI video cards, with the latest ATI drivers installed, have the option to reduce DVI frequency or use alternate DVI operational mode. Check and see if your video card supports those options, and play around with them if so. Also, you can try using some third-party programs to create a new resolution profile with a refresh rate of 58 or 59Hz instead of the standard 60Hz.
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http://pastebin.com/hbmdKrfv
Xorg-logs
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An xorg.conf may not be necessary, but I still find it nice to have the control that the file provides.
In looking over yours, I see several things that could be causing your problems.
First off, I notice that you have Screen0 that is using Card0 and Monitor0. This part looks ok.
When I look at Screen1, I notice that you are using ATI Graphics Adapter1 and Monitor1. I don't see entries for either of those, although you have an ATI Graphics Atapter2, but there is no entry for your second monitor.
I also notice that you are trying to use both radeon and fglrx as drivers. As far as I know (and I don't have an ATI video card at the moment), you can use one driver or the other, but not both.
After you have these things fixed, then you can put in the Screen section in your server layout to describe the positioning of your second monitor.
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Hello,
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Hi.
Anybody who can give me a straight answer here.
I have a Mac Pro3.1 8 Core 2.8Ghz with Radeon 3870 card. (Standard 2600 HD)
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Someone? not working? I think they mean that some features won't be supported, like perhaps OpenCL.
Use GT120 cheap and works or shell out for ATI 4870 (or wait and see if anything comes out this year).
http://store.apple.com/us/product/MC002ZM/A
Most of what is written seems like it wasn't a tech writer, but then Apple doesn't get into telling customers what UEFI/EFI64 is the over-riding requirement.
Take Apple hardware specs with grain of salt.
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http://store.apple.com/us/product/MB999ZM/A
Even the GTX 285 works, if interested.
http://store.apple.com/us/product/TW387ZM/A
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*2009 Mac Pro owner running GTX-285 and ATI 4870 Cards*
(via Aux power Y adapters) And yes, he knows that apple lists 300W Max for the PCIe cards in the manual.
I've got the dual high-power graphics cards running without a hitch. It's rendering with the GTX 285 and CUDA now while I use the computer with the Radeon 4870 (no GUI lag, which is a nice change from using the GTX 285) http://www.xlr8yourmac.com/

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Large horizontal lines going across the screen - especially when it is displaying quickly moving images. These horizontal lines move upward, as if trying to refresh the image. Examples: playing a video, scrolling down a webpage, rearranging windows.
_My computer setup_
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Thank you for your answer; I followed your suggestions:
The card is working fine in terms of spinning and is not dusty.
I booted from the Mac OS Installer DVD, and couldn't replicate the problem. But I don't think that's a good indicator, because this problem is intermittent and doesn't manifest itself consistently. Also, there's no way of playing video or scrolling down a webpage from the Installer DVD.
Also, I tried switching the two display connectors around (plug 2 to plug 1 and vice versa), which caused something interesting to happen: I stopped seeing vertical lines but started getting WEIRD flickering and green artifacts. Again, this happened on both screens.
The Apple Hardware Test said everything is fine (weird).
I think I'll try your suggestion of re-installing the OS. I always dread doing it. But hey maybe it'll make my computer run fast again (it's been running slowly lately).
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I knew that before I did this there may be incompatibility problems with this card and Lion on the older Mac Pros,
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I also get a loading bar for about 20 seconds. This gets to about 20% then disappears.
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ATI RADEON 5770 on Mac Pro 2006

Hello,
I am using a MacPro 1.1 (from 2006) and out of the blue my video card which was Geforce 7300GT burned out. I can't find a replacement card which is the same and only combatible one I found is Ati Radeon 5770. Before I move on buying this card I am wondering whether it will work first of all on my mac pro, and if so which exact model should I purchase since I see some differences in each one as far as the memory bus (4800Mhz, 5200 Mhz and 1200 Mhz) and the processor clock speed ( 850 Mhz and 875 Mhz) I would really appreciate some help on this matter since it's already 2 weeks I am trying to solve it.
Thanks!

Well, thank you for that.
If you are lucky or willing, the link I have for 1st gen 8800GT model on ebay. Pricey as can be though.
Also:
http://myworld.ebay.com/macvidcards/
Hopefully 5770s are waiting for drivers or to be replaced with Radeon 6xxx series (but which would then require more retooling of drivers you can be sure).
Last year this time, the 5000's were just coming out. Nvidia was also inbetween the FERMI (GeForce 400s) and older GTX 200 series which caused shortages and when you could find anything, inflated pricing.
When I bought the 8800GT I also picked up ($129) OS X DVD 10.5.6 (had I guessed, I would have waited for Snow Leopard @ $29 maybe). And, you have to call but 10.5.x DVDs can be ordered by phone Apple Store but not online (another peeve, it is almost impossible to buy Leopard now, the last that supports PowerMacs too).
At least the Apple variety of ATI Radeon work in any and all Mac Pro models.
If there is a way to flash or work with PC cards, that would come from MacRumors Mac Pro.
http://forum.netkas.org/
http://forums.macrumors.com/forumdisplay.php?f=1

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Mac Pro community is here.
Did you try Apple Hardware Test by extended testing?
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Hello pitin,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
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http://support.apple.com/kb/ht1573
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