Aside from the improved polymorphic engine in the SSMs, it is also the first Nvidia chip to support DirectX 12 Feature Level 12_1. Compared to the mid-range GM107, the newer and larger GM204 has several additional features and changes. Furthermore, the L1 (96 KB per SMM) and L2 caches (2 MB) have been significantly increased to lower the needed bandwidth. Thanks to an improved compression algorithm, the connection to the GDDR5 memory should be significantly more efficient per MHz. The memory interface has a bandwidth of 128-bits (2x 64 bit) for each of the two GPUs. In addition, there are 32 ROPs in two clusters with 16 units each. As a result, only 1024 shader ALUs and 64 TMUs are active. But, in the GeForce GTX 965M, Nvidia have deactivated 8 of 16 SMMs. The GM204 features four GPCs, and each consists of four SMMs. Now each SMM contains only 128 shader units and 8 TMUs, which is noticeably less than an equivalent Kepler GPU.
Among other changes, Nvidia have restructured the streaming multi processors (SMM) in order to increase workload and efficiency. GM204 is based on Nvidia's Maxwell architecture, which replaces the previous Kepler generation.
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 30 fps. With SLI, each card renders a single frame (AFR mode). The clocks for the SLI-setup are usually identical to a single GTX 965M (924 MHz GPU, 1250 MHz memory). Each card has a 28 nm GM204 GPU based on the Maxwell architecture, which is the same chip as found on the GTX 980M, GTX 970M as well as several desktop cards. The NVIDIA GeForce GTX 965M SLI is a high-end DirectX 11-compatible graphics solution for laptops, consisting of two GeForce GTX 965M. NVIDIA GeForce GTX 965M SLI ► remove from comparison
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