Trying to decide between these two Radeon 6870 Graphics cards: SAPPHIRE AMD Radeon HD 6870 1GB GDDR5 PCIE Graphics Card http://www.amazon.com/SAPPHIRE-Radeon-6870-GDDR5-Graphics/dp/B005C8RTTU/?ref=cm_cr_pr_product_top OR XFX AMD Radeon HD 6870 900M 1 GB DDR5 DUAL MINIDP HDMI DUAL DVI PCI-E Video Card http://www.amazon.com/XFX-Radeon-MI...F8&qid=1340580494&sr=1-2&keywords=Radeon+6870 My system is the Early 2008 Mac Pro (3,1), 8 Core 2.8, running 10.7.4 Does anyone have any experience with either of these cards in 10.7.4? Success or failures? The XFX is listed as a "mini" and looks to be shorter in length. I don't know if that's a good or bad thing. There is one Amazon reviewer who has the Sapphire running on his Mac Pro 3,1. By any chance has anyone had these cards running with a Mountain Lion build? I realize I won't have bootscreen, DVD player and Steam games. Thanks!