PCB Design and Features
The ASUS GeForce GTX 780 Ti DirectCU II OC has a rather unusual appearance because its sculpted cooler casing has no coloring. The card looks somewhat dull as the consequence.
Well, that’s not a problem, actually. Included with the card are two sets of colored stickers which let you customize its appearance if you want to.
The card measures 287x133x40 millimeters, so it is 20 and 33 mm larger than the reference GTX 780 Ti in length and height, respectively.
Like the reference card, the ASUS version has dual-link DVI-I and DVI-D outputs, one HDMI 1.4a and one DisplayPort 1.2. The video connectors are protected from dust with plastic caps.
The cooling system being larger than the PCB, the SLI connectors have to be implemented via an additional small PCB.
This solution doesn’t look pretty but you will hardly have problems connecting your SLI configuration. The card has two 8-pin power connectors with red and green LED indicators. The peak power draw is specified at 375 watts. A 600-watt PSU is recommended for a PC with one such graphics card inside.
Although massive, the cooler is secured with only four screws around the GPU, so it was easy to take off:
To dismantle the card further, we unfastened the metallic back-plate and the small aluminum heatsink mounted on the power components. Now we can have a closer look at the card’s PCB:
Like all other ASUS products of this class, the card features Super Alloy Power technology. Comprising premium components and a custom PCB, it ensures high energy efficiency (by up to 15% on this specific graphics card model), lower interference and longer service life (by up to 2.5 times).
The power system incorporates 10 phases: 8 for the GPU and 2 for the graphics memory and PLL.
Tantalum capacitors and ferrite-core chokes help ensure stability at high loads.
The GPU voltage regulator is based on a DIGI+ ASP1212 controller:
The 28nm GK110-425-B1 graphics chip was manufactured in Taiwan on the 44th week of 2013 (late October or early November).
Its base clock rate in 3D mode is increased to 954 MHz (by 8.9%) compared to the reference card’s. That’s the smallest factory overclocking we’ve seen so far in our tests of original GTX 780 Ti products. The peak boost frequency is 1020 MHz. According to our monitoring tools, the GPU voltage is 1.175 volts in 3D mode and 0.887 volts in 2D mode. The ASIC quality of our GPU sample is 69.0%:
The ASUS GeForce GTX 780 Ti DirectCU II OC is equipped with 3 gigabytes of GDDR5 memory in 12 chips from SK Hynix (marked as H5GQ2H24AFR-R2C).
The memory chips are rated for 7000 MHz and are indeed clocked at that frequency. So, the memory is not pre-overclocked. With a 384-bit bus, the peak memory bandwidth is 336 GB/s.
The latest version of the GPU-Z utility provides a summary of the graphics card’s specs:
Now we can proceed to checking out its cooling system.