Reference PCB vs non reference
Reference: Blower style fan, 9.5" long, supports voltage OC, hot air blows out of the vents
non ref: central axial fan, 10.5" same length as HD5870 with power sticking at the end, not at the top, no volt. OC and hot air blows in both directions.
Some models may have this type of design, but supports volt. OC.http://www.ncix.com/products/index.php? ... acture=XFX
I've got myself a HIS HD5850 with a blower fan, and support volt.OC as seen in that image in my previous post.
In after burner after unlocking it, the sliders turns on allowing me to adjust the settings. Non ref parts even when it's unlock that slider
is still grey out.