HD-Audio codecs, such as Dolby TrueHD and DTS-HD, can be transmitted via bitstream mode through the HDMI port. Furthermore, high resolution monitors of up to 3840x2160 pixels can be connected using DisplayPort 1.2 or HDMI 1.4a (if available). The feature set includes support for up to 4 active displays. With good driver support, SLI almost doubles the performance of a single card, allowing fluent frame rates even with FullHD resolution and highest detail settings. This makes the SLI configuration of two GTX 880M the currently fastest mobile graphics solution on the market (as of early 2014). Similar to our single GPU benchmarks, the GTX 880M SLI outperforms the GeForce GTX 780M SLI by about 10 percent. This boost is supported by every GeForce 800M GPU. The mobile Kepler series supports PCIe 3.0 as well as an optional Turbo mode, which can automatically overclock the card if the laptop cooling system allows it. However, due to the missing hot clock of the shader domain, two shaders of a Kepler chip are of similar speed to one shader of a Fermi chip (as the latter is clocked twice as fast). Although the Kepler architecture can utilize more shader cores than a Fermi chip, its shaders can be up to twice as power efficient. In the GTX 880M, all eight blocks are active for a total of 1536 CUDA cores. The GK104 Kepler core offers eight shader blocks, called SMX, that are clocked at the same speed as the central core. The Kepler architecture is the successor to the Fermi architecture that first appeared in laptops with the GeForce 400M series. This happens because of different timespans between two frames (e.g., irregular delays between sequential frames). Therefore, it may suffer from micro stuttering in low fps ranges of 30fps. The clocks for the SLI-setup are usually identical to a single GTX 880M. With SLI, each card renders a single frame (AFR mode). Each card has a 28nm GK104 core based on the Kepler architecture. The NVIDIA GeForce GTX 880M SLI is a high-end DirectX 12-compatible graphics card for laptops, consisting of two GeForce GTX 880M. NVIDIA GeForce GTX 880M SLI ► remove from comparison

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