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Zalman CPNS6000-CU heatsink review



Today, I'm reviewing a heatsink from ZalmanUSA.com, the the Zalman CPNS6000-CU. This is not your ordinary looking heatsink. It is actually the most unique looking heatsink that I have ever came across. It is made mostly of solid copper, with HUGE copper fins fanning out, and is sometimes referred to as the flower heatsink. Because of this design, it has to be the coolest looking heatsink I have seen, but does it cool as good as it looks? Lets find out!

This is the pretty retail box it came in. Notice the text on the top of the box, "For computer noise prevention system". They say the fan on this heatsink is super quiet, I just hope the cooling efficiency doesn't suffer because of this.

What you get

  • The heatsink
  • Fan bracket
  • (2) Clips (in case you loose one)
  • Fan Mate 1
  • Clip mate
  • Some screws
  • Thermal grease


    FHS Specifications
    Part Number ZM6558BC-Cu
    Dimensions (mm) 95~110(L) x 63(W) x 65(H)
    Dissipation Area (cm2) 2600~2900
    Base Material Pure Copper
    Weight (g) *462
    Thermal Resistance(Deg.C/W) Silent Mode 0.31
    Normal Mode 0.23
    *The maximum weight for a heatsink is specified as 180g by Intel CPU(Socket 370) and as 300g by AMD(Socket 462). Should a heatsink which exceeds the relevant weight limit be installed in a computer, special care should be taken when the computer is moved. Zalman Tech Co., Ltd. is not responsible for any damage to a system or a CPU occurring when moving a computer with an overweight heatsink.

    Fan(PS92252H) Silent Mode Normal Mode
    Dimensions(mm) 92(L) X 92(H) X 25(W)
    Weight (g) 88
    Rot. Speed 1600 RPM +- 10% 2500 RPM +- 10%
    Noise Level (dB) 20.0 33.0
    Bearing Type Sleeve

    FAN RPM Controller
    FAN MATE 1 Specifications
    Dimensions (mm) 200(L) X 21(H) X 23(W)
    Weight (g) 20
    Output Voltage 5 ~ 11 V +-2%
    Allowable Wattage 6W or lower

    Closer look

    The flower shaped heatsink has a total of 60 copper fins. All of the fins come together at the base of the heatsink (where your cpu core will be located) and are bolted together very tightly with two bolts.

  • If you look at the heatsink from a top view, you will notice four fins in the middle are aligned with the other fins. They made this little slot so that the heatsink clip can slip down thru it.

    The base of the heatsink, is VERY smooth. You can clearly see that Zalman has engineered a very flat surface. A flat surface is crucial to efficient cooling.

    In this picture you can see the two clips they provide. I think it's great they provide two clips, because sooner or later I always loose a heatsink clip :) Notice the little hole on the ends of these clips. These little hole plays a major part in how this heatsink is installed. More about this, later on in the review.

    Once you have your thermal paste on your CPU core, you can place the heatsink on top of your CPU. Zalman has provided some thermal paste with the heatsink, and will be using their thermal paste to simulate the experience you would have if you bought this heatsink. Once you have the heatsink place on your CPU, you can place the clip on the heatsink, if you have not already done so.

    Next is the easiest part of the installation :) Zalman has provided a heatsink installation tool, called clip mate. The clip mate is really just piece of metal that has been bent so it has a handle, and the tip of the metal is coned shaped to fit in the hole of the clip (that I showed you earlier). Using the clip mate to install the heatsink is simple. You place the tip of the clip mate in the hole of the heatsink clip, then push down slightly, then tilt out. It's basically the same way you would use a screw driver to install a heatsink clip, but you don't have to worry about slipping off and damaging your motherboard with the clip mate.

    Now you maybe asking, how the heck are you suppose to install a fan on this weird looking heatsink? Well, there is really no other way than the way Zalman came up with. The fan is mounted using an metal arm bracket that is attached to your PCI slot screws.

    It was slightly time consuming when I was installing the fan bracket, because my PCI slot screws are actually thumb screws and because of this, it made it a very tight fit. Also, it was slightly hard to align all the holes up. Once you finally get the fan bracket installed, you can adjust the fan to blow directly over the heatsink. The large brass screw on the bracket, will allow you to slide the fan in just about any position you want. This is great, because it makes the fan & bracket very universal, to fit any motherboard or case.

    Here is where I had to align all the holes

    I have positioned the fan exactly where I want it

    Many heatsink manufactures are using fan controllers now days. A fan controller allows the user to adjust the speed of the fan, and this also means how loud or how quiet the fan will be. You simply connect the device between the fan, and the power source, which is your motherboard. The fan controller also supports, fan monitoring so you can see the RPM of the fan, via your bios or your operating system. The knob on the fan controller could have been slightly bigger, as it's kind of hard to adjust if you have big fingers.

  • Testing
    Test Rig

  • Abit KR7A-133Raid
  • Athlon XP 2100+ (not overclocked)
  • Samsung PC2700 DDR Memory
  • Geforce 4 ti 4600
  • SB Audigy X-Gamer
  • Windows XP

    Our testing method:


    I allowed the system to idle for 10mins to get the idle temperature.
    In order to get the load temperature, I ran two [email protected] programs while running a SiSoft Burn in test.
    I used a comp-u-nurse temp probe and a laser temp probe to get the temperature.

    This test compares the idle and load temps between the Volcano 9 and the Zalman CPNS6000-CU. This test was also done with my case panel ON.

  • This test compares the idle and load temps between the Volcano 9 and the Zalman CPNS6000-CU. This test was also done with my case panel OFF.

    As you can clearly see, the Zalman CPNS6000-CU doesn't come near to beating the Volcano 9 heatsink, despite the pretty looks of the CPNS6000-CU. The volcano 9's full load temp was lower than the Zalman CPNS6000-CU idle temp..


    I was kind of disappointed with the performance of the Zalman CPNS6000-CU. I was hoping that it would of cooled better than it did, because I absolutely love the looks of the heatsink. Zalman, specializes in quiet cooling products. The CPNS6000-CU was indeed very quiet, but where it succeeded in that, it lacked in cooling. If your not an overclocker, and are just looking for a quiet heatsink then you might consider this one, because of the looks. However, you can find other heatsinks that cool just as good and that are quiet, at a much cheaper price.

    I'd like to thank Zalmanusa.com for providing us this heatsink to review!

    • VERY easy to install
    • Very quiet
    • It looks very cool
    • Fan controller

    • Doesn't cool efficiently
    • Pricey

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