Design and Functionality
The official GeForce GTX 760 announcement has already been accompanied with announcements of its original versions with exclusive coolers and factory overclocking from nearly all of Nvidia partners. We will try to get some of them for our tests but today we will be talking about the reference sample.
The GeForce GTX 760 looks simpler than the GTX 780 or GTX 770, resembling the GeForce GTX 650 Ti Boost in its appearance:
The sculpted plastic casing of the cooling system covers the entire face side of the card. On the reverse side we can see a short PCB extended by a plastic fan enclosure. The green words “GeForce GTX” on the top edge are not highlighted. The card is 242 mm long.
The Nvidia GeForce GTX 760 is equipped with three video outputs: dual-link DVI-I and DVI-D, HDMI 1.4a, and DisplayPort 1.2.
The GTX 760 is no different from the top-end models of Nvidia’s new series in terms of video interfaces. It also has two MIO connectors (for joining two, three or even four graphics cards in SLI mode) and two 6-pin power connectors in their conventional locations:
According to the specifications, the GeForce GTX 760 consumes no more than 170 watts of power, which is 60 lower than required by the GTX 770 and 20 watts higher than required by the GTX 660 Ti which also has two 6-pin power connectors.
It would have been odd for Nvidia to develop a completely new PCB for a graphics card with such specs as the GeForce GTX 760 has. So it is based on the PCB from the GeForce GTX 660 Ti that the new model has come to replace.
The power system is located in the front part of the device and cooled with a large aluminum heatsink. It incorporates 4+2+1 phases (GPU+memory+PLL).
It is managed by an ON Semiconductor NCP5392P controller you can find on the reverse side of the PCB.
By the way, there are empty places for memory chips on both sides of the PCB, so we can expect 4-gigabyte versions of the GeForce GTX 760 in the future.
The GK104 revision A2 chip of our sample was manufactured on 28nm tech process in Taiwan on the 15th week of 2013 (in mid-April).
The GPU die is only 294 sq. mm, incorporating 3540 million transistors. The base GPU clock rate in 3D applications is 980 MHz. It can be officially boosted to 1033 MHz but in our tests, with maximum power and temperature targets, the GPU clock rate would peak up to 1137 MHz, which is a good 100 MHz above the specified level. The effect of the GPU Boost 2.0 technology is obvious here.
The GPU clock rate is dropped to 135 MHz in 2D applications while its voltage is lowered from 1.2 to 0.862 volts.
The reference GeForce GTX 760 carries 2 gigabytes of GDDR5 memory in FCBGA-packaged chips located on both sides of the PCB. These are Hynix’s H5GQ2H24AFR R0C components:
The memory chips are rated for 6000 MHz and the GeForce GTX 760 uses that memory clock rate in 3D applications. In 2D mode the memory frequency is lowered to 648 MHz. The memory bus width is mentioned above in the specifications section.
Here is what the GPU-Z utility can report about the GeForce GTX 760:
The ASIC quality of our GPU is 80.3%: