Koolance 1000W Liquid-Cooled Power Supply

Part No. PSU-1000ATX-12N This product is archived and displayed for information only. It is no longer available for purchase. Released: 03 September 2009

The Koolance PSU-1000ATX-12N provides 1000W of continuous output in a smaller and lighter profile than the PSU-1300ATX-12N. Completely flooded in a special non-conductive cooling liquid, the fan-less PSU-1000ATX-12N is superior to even "partly" water cooled and heat pipe power supplies.

Heat Transfer Method

Featuring a compact liquid-to-liquid heat exchanger developed exclusively by Koolance, the PSU-1000ATX-12N provides the most efficient heat transfer available among any ATX power supply. Heat from each component is dumped directly into an internally circulating non-conductive liquid, through the heat exchanger, and out to an existing water cooling system. Thus, liquids are kept completely separate and normal cooling fluid can be used with the PSU-1000ATX-12N.

The PSU-1000ATX-12N is not a self-dissipating product and must be connected to an existing water cooling system via its external fitting sockets (G 1/4 BSPP threading). A PCI L-bracket "slot adapter" is provided for easy hose routing back into the chassis through an available card slot. This helps reduce the power supply's internal length.

When used at maximum output capacity, Koolance recommends a water cooling system capable of dissipating at least 200W of heat. This is in addition to other water-cooled components. In other words, if your cooling system is designed around a 700W hardware heat load (CPU and dual video card water blocks, for example), the PSU-1000ATX-12N should be allotted an additional 200W of cooling capacity. If unavailable, it is also possible to dedicate a separate cooling system solely for the power supply, such as any of Koolance's Exos systems.


  • Power efficiency is rated at a minimum of 80%
  • Fully modular plugs and cables
  • Four 8-pin and four 6-pin PCI-Express connections for convenient quad SLI and CrossFire™ support
  • Two 8-pin (or 4-pin) 12V connections for server motherboards
  • Four internal temperature sensors, with liquid temp outputted for monitoring (when used with 50K Ohm compatible Koolance systems)
  • Built-in audio alarm and auto-shutdown features based on three internal temperatures and the pump
  • The only material in contact with the external cooling liquid is stainless steel


  • The PSU-1000ATX-12N can be used in most ATX, E-ATX, and BTX chassis that provide for 8.15" (20.7cm) power supply depths, not including cable space. (Please see the compatibility page for more information.)
  • The PSU-1000ATX-12N's small external liquid-to-liquid heat exchanger may conflict with some chassis that use restrictive rear mounting plates for the power supply. In most situations, minor modification to this plate (or removal, where possible) will fix the issue. (Please see the compatibility page and product manual for more information.)
  • Due to the weight of the unit, additional support may be required for top-mounted-PSU chassis that can benefit from increased stabilization.
  • For internal cooling systems, a PCI "slot adapter" is included to route 6mm (1/4in) or 10mm (3/8in) ID tubing back into the chassis. 13mm (1/2in) tubing will not easily fit through a PCI slot and must be routed into the chassis another way (for example, via the Koolance BKT-PCI-G).

Power Specifications

  Type   EPS12V
  Max. Power (Continuous)   1000W
  Operating Range   110-240VAC, 47-63Hz, Auto-Switching
  Current   12A @ 110V, 6A @ 240VAC
  Fan   (none)
  PFC   Active
  Efficiency   80% Minimum
  Power Factor   >0.99
  DC Output

  +5V @ 30A
+3.3V @ 30A (combined +5V and +3.3V is 180W max)
+12V @ 70A (12V1@18A, 12V2@18A, 12V3@30A, 12V4@30A)
-12V @ 0.8A
+5VSB @ 3.0A
  Regulation   3% (3.3V, +5V, +12V) +3-5% (5Vsb) 10%(-12V)
  Ripple & Noise   50mV (3.3V, 5V, 5Vsb), 120mV (-12V), 240mV (+12V)
  Hold Time   16ms
  PG Delay   100~500ms
  Over Voltage Protection   +3.3V, +5V, +12V
  Over Current Protection   +3.3V, +5V, +12V
  Over Temperature Protection   Heat sink: 85°C Alarm, 90°C Power-Off
  Pump Protection   Power-Off on no RPM signal
  Operating Temperature   0-50°C (External secondary coolant temperature)
  Storage Temperature   -10 - 70°C
  Humidity   20-90% RH
  Altitude   0-7000 feet (0-2134m)
  Cables   1 x 24-pin motherboard
2 x 8-pin (or 4-pin) 12V CPU/motherboard
4 x 8-pin (1-plug) PCI-E
4 x 6-pin (1-plug) PCI-E
2 x (4-plug) SATA
1 x (4-plug) Molex
1 x (4-plug + 1 FD) Molex peripheral + floppy


Weight 12.40 lb (5.62 kg)
Materials Nickel-Plated Brass, Stainless Steel, EPDM
Diagrams / Models (See Files Tab for Diagrams and 3D Models)

Tags: Power Supply,

Liquid Coolants

Koolance's product warranty does not cover the use of 3rd-party coolants, coolant additives, or corrosion. Koolance LIQ-702 or LIQ-705 coolants are strongly recommended to help avoid issues with mixed metals or biological growth. Additionally, do not use aluminum with bare (unplated) copper or bare (unplated) brass in the same system. Do not use silver with nickel in the same system.