Got a cheap GTX670 second hand, and went to install into my current rig. two major issues arose:
card 1" longer than existing card, already touching a HDD
requires 2 x 6pin power plugs (instead of one).
The fan was touching the hard drive = horrible noise. I added folded card + blu-tac to (thin) fan shroud to gain 1mm clearance by slightly flexing the card - phew.
The power was a serious issue, seeing I have a non-modular PSU, and 6 drive installed, so no spare molex and only one spare SATA power. I managed some creative splitting and gained a single molex. Went through my parts collection and found the incredibly rare SATA POWER->MOLEX adaptor. I already had a two-molex->6pin adaptor. Managed to clear the cables from under the two MASSIVE cooling fans on the 670, and restarted.
Both Windows 7 and Mac OS X just picked up without a hitch (Win7 reinstalled NVIDIA drivers from before, and required a restart).
20% higher framerate/score in Unigine Heaven. Ultra-HD Unigine Valley 30+ fps WOW!
I also have a spare GTX 660 now, along with a Core-i5 3450, ready for my next Hackintosh build :-)
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