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...

@ 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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