Hello all, I have a 2008 Xserve that I am using as a HTPC. (I know what you're thinking right now, but please don't say that the Xserve wasn't designed for this, isn't supposed to do this, etc. It just works best for me in my scenario.) I replaced the Xserve's puny x1300 with a Sapphire Radeon HD 6870 1GB and updated the Xserve to Mavericks (I don't like Yosemite quite yet) following jamall's first guide in this thread (Note: I did not cut a hole for my pci-e extension in the top case, I just put it out the back) and now I get a "flickering." I guess that's the best way to describe it. The issue happens extremely often and will not stop. I linked a video in Google Drive of the issue here. I would have attached it, but filesize restrictions prevented me from doing so..... The plot thickens more; however. The flickering does not occur when using my old 17" Viewsonic monitor over DVI. The video card is connected with an HDMI cable to an A/V receiver (I've tried about 10 different cables here) with a TiVo and BluRay player plugged in through HDMI as well. The output from the receiver goes over HDMI to the theater's projector which is wired about 50-60ft through the wall, so no getting that one out. When using the TiVo or BluRay, the flickering does not happen which leads me to believe that something is wrong with my card! Can anyone confirm that my video card is going to crap out soon or shed some light on the real issue at play here? Thanks in advance!