Display Outputs And Tessellation Performance
As previously mentioned, GeForce GTX 590 comes equipped with three dual-link DVI outputs and one mini-DisplayPort connector. You can use all four concurrently in productivity-oriented environments, but taking advantage of Surround or 3D Vision Surround limits you to three. Be aware that creating a single display surface via Surround mode kills HDCP compliance for things like Blu-ray movie playback.
This is one comparison where AMD comes out on top definitively. We’ve seen the company enjoy much success with Eyefinity, and that halo feature remains the reason I continue using Radeon-based cards in my production workstation. Even with two GPUs on a single card, Nvidia’s flagship cannot match the output connectivity of a single Radeon HD 6000-based board. Hopefully this compels the company to devote more attention to what has become a must-have feature for the growing contingent of folks who’d rather spend a couple hundred bucks each on three 1920x1080 displays versus $1500+ on a nice 2560x1600 monitor.
Another Look At Tessellation
I’ve been fairly critical of Nvidia’s scaling story when it comes to geometry performance. Titles like HAWX 2 have proven to be demanding enough to demonstrate the relative weakness of AMD’s Radeon HD 5000-series cards. However, I haven’t been able to show the real benefit of moving from eight Polymorph engines (in the GeForce GTX 560 Ti) to 15 or 16 (in the GeForce GTX 570 and 580).
Meanwhile, AMD’s Radeon HD 6990 showed us that four of the company’s own tessellation engines can maintain 76% of the card’s performance with the feature turned on versus disabling it completely.
The GeForce GTX 590 reestablishes Nvidia’s dominance by achieving 83% scaling, shedding just 41 frames when tessellation is turned on at 1920x1200. It probably bears further examination as to what, exactly, prevents better scaling on the single-GPU cards. But I don’t think the problem is related to geometry throughput.