ASUS GeForce GTX 780 DirectCU II OC Review

Published by Marc Büchel on 19.06.13
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Technical Data / Specifications


With the ASUS GeForce GTX 780 DirectCU II OC you get a card which features a custom PCB as well as a custom cooler. The ASIC quality measured on our sample was 80.4 % which is high considering the average being at 73 % on the cards we had at hands.
About ASIC quality:



ASUS' GeForce GTX 780 DirectCU II OC 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 Gigabyte of GDDR5 memory, which is clocked at 1'502 MHz (effective 6'008 MHz). In the end there is a memory bandwidth of 288 Gigabyte per second. Concerning the GPU's clock speeds it runs at a base clock of 889 MHz and a boost clock of 941 MHz. During our tests the highest boost clock we measured was 1'045 MHz and the average boost clock was also 1'045 MHz.

The ASUS GeForce GTX 780 DirectCU II OC 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 104 MHz higher than the typical boost clock NVIDIA advertises.



nVidia GeForce

GeForce GTX Titan

ASUS GTX 780 DCU 2 OC

GeForce GTX 780

GeForce GTX 770

Chip GK110 GK110 GK110 GK104-425-A2
Process 28 nm 28 nm 28 nm 28 nm
Transistors 7.10 Billion 7.10 billion 7.10 billion 3.54 billion
GPU clock 837 MHz 889 MHz 863 MHz 1'046 MHz
GPU Boost clock 876 MHz 941 MHz 900 MHz 1'085 MHz
Memory 6'144 MB GDDR5 3'072 MB GDDR5 3'072 MB GDDR5 2'048 MB GDDR5
Memory clock 1'502 MHz (6'008 MHz) 1'502 MHz (6'008 MHz) 1'502 MHz (6'008 MHz) 1'750 MHz (7'000 MHz)
Memory interface 384 Bit 384 Bit 384 Bit 256 Bit
Memory bandwidth 288'400 MB/s 288'400 MB/s 288'400 MB/s 224'400 MB/s
TMUs 224 192 192 128
Shader Cores 2'688 (14 SMX) 2'304 (12 SMX) 2'304 (12 SMX) 1'536 (8 SMX)
ROPs 48 48 48 32
Maximum board power 250 Watt XXX Watt 250 Watt 230 Watt
PCB Type Reference Design Custom Design Reference Design Reference Design
Lenght (PCB - Total) 27.0 - 27.0 cm 26.7 - 28.7 cm 27.0 - 27.0 cm 26.7 - 26.7 cm
Height (PCB - Total) 11.0 - 11.0 cm 12.0 - 14.2 cm 11.0 - 11.0 cm 11.0 - 11.0 cm
Slots 2 2 2 2
Cooler NVIDIA Reference ASUS DirectCU II NVIDIA Reference NVIDIA Reference
MSRP $999 $XXX $649 $399


ASUS decided to equip the GeForce GTX 780 DirectCU II OC with a new version of their famous DirectCU II cooler. In case of this card you get no less than five heatpipes, two six millimeter, two eight millimeter and one massive ten millimeter. Soldered to the heatpipes you find the fin stack which is being provided with fresh air via two fans. The fan closer to the I/O shield as a new "CoolTech" unit from ASUS. They claim that this fan is able to provide a higher airflow than standard axial or radial fans at the same noise level. In case of the second fan you find a standard axial fan. Overall this version of the DirectCU II cooler was able to impress. In 2D the fans are very silent and in 3D the card is still silent.



A closer look at the PCB shows that ASUS equipped this card with a digital ten phase power design. The GPU gets its current from eight phases and the two phases left take good care of the memory. Once more ASUS is using high quality super allow chokes and on the backside of the GPU you find dedicated SAP CAP's to maximize overclocking headroom. 

Checking the voltage regulation chip we find a digital multi-phase buck controller ASP1212 from IR (International Rectifier). Furthermore there is an unidentified Richtek 2-phase PWM labelled 02=FA F2B taking care of a stable current supply for the the memory.



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).




Page 1 - Introduction Page 13 - DIRT Showdown
Page 2 - Technical Data / Specifications Page 14 - Far Cry 3
Page 3 - Preview & Delivery Page 15 - Max Payne 3
Page 4 - Test Setup Page 16 - Sleeping Dogs
Page 5 - 3DMark 11 Page 17 - The Elder Scrolls V: Skyrim
Page 6 - 3DMark Fire Strike Page 18 - Metro: Last Light
Page 7 - Unigine Heaven 4.0 Page 19 - Power Consumption
Page 8 - BattleField 3 Page 20 - Fan Speed / Noise Level
Page 9 - Borderlands 2 Page 21 - Temps - Idle / FurMark / BF3
Page 10 - Bioshock Infinite Page 22 - Performance/Price & Performance/Watt
Page 11 - Crysis 3 Page 23 - Conclusion
Page 12 - Call of Duty Black Ops 2



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