EK Wave (AMD64/P4 S478) Waterblock

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Waterblock Test – Joe

SUMMARY: An attractive, well performing, low-moderate pressure drop waterblock.


The good guys at EK Water Blocks were nice enough to send a sample of their EK Wave (AMD64/P4 S478) Waterblock to try out. This is a copper base waterblock, acrylic top, with ½” or 3/8″ barbs (user choice). The sample I tested was with ½” barbs.

Key Features

  • Base of electrolytic copper, lapped and polished to +/- 0.0007 mm flatness
  • Acrylic top
  • Eight waved channels
  • Low pressure drop
  • ½” or 3/8″ barbs

A close shot of the base shows the “waved channels”:

WB Close

Note that there is a slot over the channels to distribute water to them – this is NOT a flow restricter.

The base appears flat, using the Poor Man’s Flatness Test


Parts ship with the unit for mounting to the motherboard’s holes:


Overall, build quality and finish appeared very good.


The EK Wave was tested using the CPU Die Simulator and Waterblock Test Rig.


Test Conditions: Inlet Water Temp: 28.5 C; Mounting force: 15 pounds; Heat Load: 70 Watts.




Pressure Drop – psi

Pressure Drop – inches H2O

EK Wave




NOTE: These results are NOT comparable to tests done by others.
Unrounded data: 0.147 C/W with 0.0011 std dev.

Test Results indicate that the EK Wave’s pressure drop (or head loss) across the waterblock is low-moderate; flow resistance such as this means that the EK Wave requires a moderate waterpump to maximize performance, depending upon how restrictive other components are in system.

I found that reducing flow to 0.5 gpm resulted in a performance decrease of about 0.8ºC and increasing flow to 1.5 gpm resulted in a gain of about 0.8ºC.

For a comparison of the EK Wave’s performance to other waterblocks tested to date, see Overclockers.com Waterblock Test Results.


Overall, the EK Wave is an attractive, well performing, low-moderate pressure drop waterblock.

Thanks again to EK Water Blocks for sending this our way.

Disclosure: Joe Citarella has a financial interest in a company developing thermosyphon products for electronic chip cooling.

Email Joe


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