The Poseidon GTX 780 video card is a top performer with some nicely engineered features giving it a great deal of performance potential. ASUS' DirectCU H2O cooler, integrated into the Poseidon GTX 780 card, offers performance equivalent or greater than that achieved by adding an after-market cooler to the card. Air-based performance increase of 10% across the board without the added fan noise normally associated with such an increase is a great achievement. The ability to gain an additional amount of performance by hooking the block into an existing liquid cooling loop is superb.


As of March 25, the ASUS Poseidon GTX 780 graphics adapter was available at for $599.99. The card was also available from other retailers such as for $599.99 with Prime shipping.


Before continuing with our final thoughts on the Poseidon GTX 780, we would like to take this opportunity to give our friends at ASUS a hearty “Thank You” for giving us the opportunity and pleasure of such a finely engineered product. I had mixed expectations going in to this review based on my own experience with water cooling CPUs and video cards. I was impressed with ASUS' design, but skeptical about the small 90mm fans and U-style cooling channel integrated into the DirectCU H2O cooler's base plate. My skepticism quickly gave way to amazement as I began to push the card performance, and turned to awe once I integrated the Poseidon in to my Koolance unit's loop. Note only was the card nearly silent under load with air cooling, but the liquid cooling temperatures rivaled those achieved with after-market full cover blocks. My awe of this revelation comes what I know about full cover blocks and their designs mimicking that of CPU coolers with micro-channels sitting atop the GPU core and optimized coolant flows over the VRM and memory components. ASUS obviously did their homework with the DirectCU H2O cooler, optimizing its design to quickly transfer heat to the integrated radiator or liquid medium. It's simplicity design and layout act to hide the complexity contained within the cooler's engineering prowess. Combine the superior cooling abilities of the DirectCU H2O cooler with the 10-phase digital power driving the card, and you have a winning combination. ASUS even integrated a back plate into the design, adding protection to the backside of the PCB as well as giving the card another passive heat dissipation path. The Poseidon GTX 780 becomes a value-add for any enthusiast's system with the most common add-ons, a water block and a backplate, already integrated into the card's design.


  • Performance and heat dissipation capabilities of DirectCU H2O cooler
  • Quality workmanship and design
  • Quality of included power circuitry and 10-phase digital power regulation
  • Overclocking potential using liquid-based cooling
  • Premium feature bundling – backplate and liquid-capable block
  • Quick-look status LEDs for power connectors
  • Integration of G 1/4" threaded ports for DirectCU H2O liquid-based cooling


  • Lack of advanced topics in manual
  • Lack of 6-pin to MOLEX power or SLI cables

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