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cloudcover replied to cloudcover's topic in nVidiaThanks, yes I came to that same result with the help of someone else and it did, indeed, solve my problem. Part of the difficulty in my case was that Dell had shipped both monitors with single link DVI cables instead. The monitors were refurbished and I assume whomever was packing them up just grabbed the wrong cables.
cloudcover posted a topic in nVidiaHi - I've gone through the process of installing OS X 10.8.3 on a system with a GA-77X-UD5H motherboard WITHOUT my external video card. I then set GraphicsEnabler=No, powered down the system, installed my GTX 660 video card, connected my Dell U2713HM monitor to it through the DVI connection, and rebooted. I didn't install any Nvidia drivers because I'd read that OS X 10.8.3 already has support for Nvidia 660 built in. The splash screen for the Gigabyte BIOS looks fine and clean, and so does the white screen with the gray apple logo on it. But when it comes to the login screen, the image is super fuzzy and noisy. I can still make out the login screen, but it's really "buzzy" (don't know how best to describe it). If I go to "About this Mac..." it shows that it's recognized the GTX 660 video card with 2048Mb memory. If I go into Display Preferences, it shows that it's running at the monitor's native resolution of 2560x1440 and at it's native 60Hz refresh rate. If I change the resolution and choose a scaled resolution that's 1920 x 1080, everything looks super clean and fine. But if I choose anything with a horizontal resolution of 1440 (my display's native resolution is 2560x1440) it gets super fuzzy and noisy again. I've tried using both the HDMI and DVI connections - no difference. And I've tried using another PCI slot- no difference. Tried another U2713HM monitor (I have two) and same problem. Would really appreciate some help as this is a major sticking point. Not sure why it would work fine at lower resolutions but not at my monitor's native resolution. Do I just have a bad video card or is there some configuration issue that I need to change? Thanks in advance.