Design and Functionality
The Zotac GeForce GTX 660 Ti 2GB looks very, very small. It must have a record-breaking price/compactness ratio where the former factor is very high and the latter, very low.
The card is only 190 millimeters long, and this with the metallic cooler casing. The PCB itself is a mere 173 millimeters.
Zotac maintains the corporate color scheme in the design of this product where the orange fans are in contrast with the black casing. We can see heat pipes sticking out of the cooler. There are two memory chips residing on the reverse side of the PCB.
Like the senior models of the series (GeForce GTX 680 and 670), the GTX 660 Ti is equipped with DVI-I and DVI-D (Dual-Link), HDMI and DisplayPort outputs. There is a vent grid in the mounting bracket to exhaust the hot air from the cooler.
There are two 6-pin power connectors and two MIO connectors for building SLI configurations. They can be found in their conventional places on the PCB.
The GeForce GTX 660 Ti is specified to consume up to 150 watts of power and is recommended to be used with a 450-watt or higher PSU.
The new card’s PCB is identical to the reference GeForce GTX 670 except for the position of the memory chips.
There’s an aluminum heatsink with thermal pad on the power circuit components located between the GPU and the video outputs. The power system formula is 4+2+1 (GPU+memory+PLL).
The GPU voltage regulator is managed by an ON Semiconductor NCP5392P controller located on the reverse side of the PCB.
Everything is exactly like on the reference GeForce GTX 670.
The GPU is the same, too. Our sample is revision A2 and was manufactured in Taiwan on the 18th week of 2012 (late April – early May).
Its base clock rate in 3D mode is 915 MHz (boosted to 980 MHz) at 1.175 volts, which is the same as the clock rate of the GeForce GTX 670. However, the Zotac version is slightly pre-overclocked, to 928 MHz. We can remind you again that the only difference between the GPUs of reference GeForce GTX 660 Ti and GTX 670 cards is the number of raster operators (24 and 32, respectively). The GPU frequency is dropped to 324 MHz at 0.987 volts in 2D mode.
The ASIC quality level of our GPU is 100%.
The high quality doesn’t guarantee good overclockability, though.
Nvidia’s reference cards are still equipped with memory from Hynix Semiconductor.
The GeForce GTX 660 Ti carries eight memory chips, two of which are on the reverse side of the PCB. There are empty places for more chips, so we can expect 4GB versions of this card to come out as well. The memory is labeled H5GQ2H24AFR R0C, so its rated clock rate is 6000 MHz and that’s indeed the card’s memory frequency. Coupled with the 192-bit bus, the memory bandwidth is 144.2 GB/s.
The latest GPU-Z reports GeForce GTX 660 Ti specs correctly:
None of popular utilities can work with the BIOS of GeForce GTX 6xx series cards as yet. It would be interesting to write the GTX 670 BIOS into a GTX 660 Ti (they have the same PCBs after all) and see what happens.