Technical Data / Specifications

With the Gigabyte GeForce GTX 780 OC V2 you get a factory overclocked card which features a custom PCB as well as a custom cooler. The ASIC quality measured on our sample was 77.4 % which is a bit higher than the average.
About ASIC quality:



Gigabyte's GeForce GTX 780 OC V2 is based on NVIDIA's massive Kepler GK110 chip, which is manufactured by TSMC using the latest 28 nanometer process technology. With the GeForce GTX 780 you get twelve SMX units which results in 2'304 CUDA cores. Following the specs further, there are 192 TMUs, 48 ROPs, a 384 bit wide memory interface and 3 GB of GDDR5 memory.
Since Gigabyte didn't bother overclock the memory, the latter stays clocked at 1'502 MHz (effective 6'008 MHz). In the end there is a memory bandwidth of 288 Gbps.
On the GPU you find quite a decent factory overclock with a base clock of 954 MHz and a typical boost clock of 1'006 MHz. During our tests the highest boost clock we measured was 1'097 MHz and the average boost clock was also 1'097 MHz.

The card also supports GPU Boost 2.0. The first version of GPU Boost stopped overclocking the GPU when a certain power target was hit. This new second version of GPU Boost stops overclocking the card, when a certain temperature is being reached. This makes sense since the temperature is the bigger inhibitor than the power target in most cases. In this case the temperature target is 80 degrees Celsius. In other words, as long as the GPU runs at less than 80°C it will keep overclocking until the maximum frequency has been reached. This is why in our case the average boost clock was 91 MHz higher than the typical boost clock the manufacturer advertises.

nVidia GeForce	GeForce GTX Titan	Gigabyte GTX 780 OC V2	ASUS GTX 780 DCU 2 OC	GeForce GTX 780
Chip	GK110	GK110	GK110	GK110
Process	28 nm	28 nm	28 nm	28 nm
Transistors	7.10 billion	7.10 billion	7.10 billion	7.10 billion
GPU clock	837 MHz	954 MHz	889 MHz	863 MHz
GPU Boost clock	876 MHz	1'006 MHz	941 MHz	900 MHz
Memory GDDR5	6'144 MB	3'072 MB	3'072 MB	3'072 MB
Memory clock	1'502 (6'008) MHz	1'502 (6'008) MHz	1'502 (6'008) MHz	1'502 (6'008) MHz
Memory interface	384 Bit	384 Bit	384 Bit	384 Bit
Memory bandwidth	288'400 MB/s	288'400 MB/s	288'400 MB/s	288'400 MB/s
TMUs	224	192	192	192
Shader Cores	2'688 (14 SMX)	2'304 (12 SMX)	2'304 (12 SMX)	2'304 (12 SMX)
ROPs	48	48	48	48
TDP	250 Watt	>250 Watt	>250 Watt	250 Watt
PCB Type	Reference Design	Custom Design	Custom Design	Reference Design
Lenght (PCB - Total)	27.0 - 27.0 cm	26.9 - 28.8 cm	26.7 - 28.7 cm	27.0 - 27.0 cm
Height (PCB - Total)	11.0 - 11.0 cm	11.0 - 12.6 cm	12.0 - 14.2 cm	11.0 - 11.0 cm
Slots	2	2	2	2
Cooler	NVIDIA Reference	WindForce 3X	ASUS DirectCU II	NVIDIA Reference
MSRP	$999	$XXX	$XXX	$649

Gigabyte decided to equip their GeForce GTX 780 OC V2 with their very own cooling solution answering to the name WindForce 3X 450W. This one features two 8mm and four 6mm copper heatpipes. Soldered to the heatpipes you find the fin stack which is being fed with fresh air via three 80mm fans. They carry the model number T128010SU and have been inclined in order to blow the air away better at the top of the card.
Overall the cooler is well manufactured but the copper base that is far from the mirror finish, since it looks industrial. Around the base you find an aluminium part which is used to fix the cooler to the PCB and also to cool the memory thanks to thermal pads.
The rear fin stack has been equipped with an aluminium plate to cool the MOSFETs of the GPU power design. A thermal pad has also been used in this case.

A closer look at the PCB shows that Gigabyte equipped its card with a 8+2 phase power design. The GPU gets its current from eight phases and the two phases left take good care of the memory.

Checking the voltage regulation chip we find a digital 8-phase synchronous buck converter NCP4208 from ON (ON Semiconductor) that support I2C. Furthermore there is an unidentified Richtek 2-phase analog PWM labelled 0T=FA V2A taking care of a stable current supply for the the memory.
On the PCB we find another chip labelled INA 3221. The INA3221 from Texas Instruments is a three-channel, high-side current sensor and bus voltage monitor with an I2C interface.

The memory chips used are made by Samsung and carry the model number K4G20325FD-FC03. They are specified to run at 1'500 MHz (6'000 MHz effective).

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