ZOTAC GeForce GTX 750 Ti OC Edition Graphics Card Review
by Stuart Davidson - 18th February 2014
ZOTAC GeForce GTX 750 Ti OC Graphics Card Launch Review
When NVIDIA lauched their GTX 780 Ti a few months ago it cemented their place at the top of GPU performance charts. The GTX 780 was competitive with AMDs high end cards, the GTX Titan was faster but somewhat priced oddly due to its developer focus so the 780 Ti brought the two words together, an unlocked Titan GPU with a more desirable price point than Titan, ideal for enthusiast gamers.
Before we take a look at the Zotac version of the GTX 750 Ti, it is worth taking a quick glance over the NVIDIA reference design as well as a few details on the New NVIDIA GPU.
Dropping down into the SM architecture the new design allows 35% more performance per CUDA core on shader limited tasks and to achieve this NVIDIA re-wrote the algorithms and scheduler to minimise stalls/bottlenecks. In addition the layout has also changed with each SM now split into four processing blocks with their own buffer, scheduler and CUDA cores. During this re-configuration NVIDIA also removed the non-power-of-two CUDA core sharing with the new partitioning simplifying design and scheduling logic to save space, power and latency. Each pair of processing blocks shares four texture filtering units and cache and the L1 cache is combines with texture cache with a separate shared memory unit. So, each SM is smaller which offering 90% of the performance of Kepler SM units. Combine those smaller units and you get 25% more peak texture performance, 1.7x more CUDA cores and 2.3x shader performance.
Finally, there are two other changes of note. Firstly NVIDIA has maximised internal memory system bandwidth and efficiency (in addition to the larger L2 cache). Secondly the hardware based H.264 encoder (NVENC) which powers ShadowPlay (amongst other things) has been enhanced. We get 6-8x real time encode performance compared to 4x in Kepler. Video decode also gets a performance boost (8-10x) and the added local decoder cache as well as higher memory efficiency per stream results in lower power use during video tasks. As a side note Maxwell has an additional power state (GC5) for light workload, such as video playback, for further power savings.
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