GTX 660 Ti
The GK104 GPU contains 1,536 shader units and a 256-bit memory bus. On the GTX 680 everything is enabled and active, with the GPU clocked at 1006 MHz, with a 1058 Mhz boost clock. The 2 GB GDDR5 memory which you find on most GTX 680 cards runs at a frequency of 1502 MHz. With the GTX 670, Nvidia reduced the number of shader units to 1,344, a decrease of 12.5 percent. The GPU clock frequency was lowered to 915 MHz, with the boost clock similarly reduced to 980 MHZ. The memory bus remained at 256 bits with a clock frequency of 1502 MHz.
The GeForce GTX 660 Ti closely resembles the GTX 670 in terms of specifications. Again it features 1344 shader units with clock frequencies of 915 MHz for the GPU, with a 980 MHz boost and the memory running at 1502 MHz. The only real difference is that the memory bus has been reduced to 192 bits. This was easily achieved; as you may remember the memory controller consists of four 64-bit segments, which means Nvidia merely had to disable one.
The GeForce GTX 660 Ti does however have the same amount of video memory, which might seem strange at first. How can you achieve the same capacity with only 3/4 of your memory controller? 1.5 GB of memory would be more logical, even if that would be less than appealing from a marketing point of view. Nvidia solved this by linking two 64-bit memory controller segments to 512 MB (two 2 gigabit chips) and linking one segment to 1 GB memory (four 2 gigabit chips). Therefore the GeForce GTX 660 Ti has a total of eight 2 gigabit chips, or a total of 2 GB of memory. The graphics cards so far still have the same PCB, so there are empty slots for memory chips.
The maximum power consumption of the card is 134 watts for games. With overclocking you can raise it 123 percent to a TDP of 165 watts. Like the other cards the GeForce GTX 660 Ti has two 6-pin PEG connectors.
The chart below has the specifications of the GTX 660 Ti, GTX 670 and GTX 680 next to each other.
| General | |||
|---|---|---|---|
| No photo |  |  | |
| Brand | Nvidia | Nvidia | Nvidia |
| Product name | GeForce GTX 660 Ti | GeForce GTX 670 | GeForce GTX 680 |
| Product code | GeForce GTX 660 Ti | GeForce GTX 670 | GeForce GTX 680 |
| Details | |||
| Specifications | |||
| Codename chip | GK104 | GK104 | GK104 |
| Interface | PCI-Express 3.0 x16 | PCI-Express 3.0 x16 | PCI-Express 3.0 x16 |
| Memory | 2048 MB | 2048 MB | 2048 MB |
| Clock frequency - Core | 915 MHz | 915 MHz | 1006 MHz |
| Clock frequency - Core (Boost) | 980 MHz | 980 MHz | 1058 MHz |
| Clock frequency - Memory | 1502 MHz | 1502 MHz | 1502 MHz |
| Memory controller | 192 bit | 256 bit | 256 bit |
| Memory type | GDDR5 | GDDR5 | GDDR5 |
| DirectX version | DirectX 11.1 | DirectX 11.1 | DirectX 11.1 |
| Vertex Shader version | 5.1 | 5.1 | 5.1 |
| Pixel Shader version | 5.1 | 5.1 | 5.1 |
| Unified Shaders | 1344 | 1344 | 1536 |
| Extra power connector |  | | |
| Power connector type | 2x PEG6 | 2x PEG6 | 2x PEG6 |
| Chip - Transistor count | 3540 mln | 3540 mln | 3540 mln |
| Chip - Production technology | 28 nm | 28 nm | 28 nm |
| SLI compatible | | | |
| Crossfire compatible |  | | |
| Integrated H.264 video decoder | | | |
| Integrated VC-1 video decoder | | | |
| Maximum power usage (TDP) | 134 W | 170 W | 195 W |
| Length | 25.5 cm | ||
