It not only allows you to optimize clock speeds, voltage and fan speeds on up to four graphics cards independently or simultaneously, you can also select between GPU Tweak’s Standard or Advanced modes depending on your level of experience.
![nvidia geforce gtx 680 2gb nvidia geforce gtx 680 2gb](https://pcper.com/wp-content/uploads/2012/04/11ae-01.jpg)
![nvidia geforce gtx 680 2gb nvidia geforce gtx 680 2gb](https://cdn.wccftech.com/wp-content/uploads/2012/03/MSI-GTX-680.jpg)
This means the whole GPU, stream processors and all, runs at a nippy base clock of 1,006MHz. Sadly, that’s not quite the case, as Nvidia has chosen to scrap the separate shader clock, long a defining feature of its GPUs. With so many more stream processors than its predecessor and an otherwise similar GPU layout, you’d be forgiven for expecting a quite extraordinary threefold increase in performance. The scheduling functions themselves have also been redesigned and greatly simplified with a greater focus on power efficiency. This doubles the GPU’s instruction per clock rate in comparison to Fermi, necessary when there are so many more stream processors to address. The number of Warp Schedulers (the part that assigns render threads from the Gigathread engine to individual SMs) has doubled to four per SM (although the total number on the GPU remains 32) and each is now able to dispatch two instructions per clock thanks to a pair of instruction dispatch units for every Warp Scheduler. This huge increase in stream processor count to 1,536 for the whole GPU (tripled in comparison to the GTX 580 1.5GB’s 512 stream processors) has required some extra additions to each SM.
![nvidia geforce gtx 680 2gb nvidia geforce gtx 680 2gb](https://www.bhphotovideo.com/images/images2500x2500/ASUS_gtx680_dc2t_2gd5_GeForce_GTX_680_2_867405.jpg)
The new SMs, dubbed SMX (presumably Nvidia is competing with AMD’s ‘GCN’ for silliest GPU lingo 2012) have been completely redesigned, and now boast a whopping 192 stream processors each, as opposed to the 32 stream processors found in each SM with Fermi. Each GPC still contains its own raster engine, but it’s within the SM that the real changes have been made. Click to enlarge - The Kepler Architecture and a side-by-side comparison of Kepler's SMX and Fermi's SMĪs with Fermi, the GPU is split into four separate graphics processor clusters (GPCs), but each is now comprised of just a pair of SMs rather than four SMs apiece, in a similar fashion to the GTX 560 Ti 1GB's GF114 GPU.