E.C.T Mach2 GT - Subzero Cooling, nVentiv lives on?

Cooling/SubZero Cooling by petervandamned @ 2005-06-16

Madshrimps is proud to test-drive a renewed phase change cooling unit from E.C.T. With temperatures reaching a stunning -70?C there is almost no better way to turn your CPU into an ice-cube. This article is all about overclocking and not overcooking your system!

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The Action

[M] CPU simulator test

While it’s fun to put a CPU under this massive cooling beast, we wanted to see just how much Watt of heat the ECT Mach GT can dissipate. In order to do this we build our very own MAD CPU simulator.

Madshrimps (c)Madshrimps (c)

This device can generate up to 625Watt of heat, much more than any current CPU can deliver. We received the sane advice of E.C.T. to not push more then 250Watt through the GT, so we happily complied.

The GT performs best at ~180Watt load, while anything over 250Watt might cause damage to it.

Two temperature sensors were attached to the GT, #1 to the micro-freezer’s head and the #2 to the CPU simulator.

The first charts displays the temperature seen on the E.C.T. Mach2 GT display:

Madshrimps (c)

Our second chart combines the 3 temperature read-outs:
  • Sensor #1 = head
  • Sensor #2 = heater
  • LCD GT display = display

    If we did not cool the CPU simulator it would have burned to the ground, at 225Watt the temperature was at 70°C and being cooled by phase-change!

    Madshrimps (c)

    [M] Real Hardware Test

  • AMD 4000+
  • GSkill 3200 GH
  • Nvidia 6800 GT in SLI
  • Antec truepower 550 watt
  • Western Digital WD 360 raptor
  • Windows 2000/XP/2003

    We were only interested in:


    If you are not sure how to overclock AMD CPU’s you should take a look at this howto : A64 OC explained, if you have questions about the ECT, you can find support at their forums: Extreme Cooling Technologies

    To test stability the small application Memtest can be quite useful, DFI even integrated it in their BIOS (using version 414 here).

    It helps you find the limit of your CPU, motherboard and memory capabilities, fine tuning is done afterwards in Windows running several game benchmarks and testing stability.

    The AMD 4000+ Clawhammer normally runs at 2400Mhz, let’s see if we can push it to the 3Ghz limit, we start of with small steps.

    GSkill 3200 GH 2 times 512 MB 2-2-2-5

    ----------200 * 12 = 2400 MHz----------220 * 12 = 2640----------

    ----------240 * 12 = 2880 MHz----------260 * 12 = 3120----------

    Now we have to make smaller steps

    ----------263 * 12 = 3156 MHz----------265 * 12 = 3180----------

    The max of 265 MHz results in errors.

    Changing back to bios version 310-2 gave better results. But old Winbond BH-5 still takes the crown when it comes down to maximum speed with low timings in Memtest.

    With CL2-3-2-5 settings it’s slower compared to the CL2-2-2-5 settings, so a nice picture but not workable for me

    ----------265 * 12 = 3180 MHz----------274 * 12 = 3288----------

    In order to get the maximum scores when benchmarking you need to switch around with Operating Systems, to facilitate life a nice multi-boot setup will come in handy

    Madshrimps (c)

    Next step in stress testing the cooling unit is by using a small application called “PIFAST” this tool will stress your CPU while it calculates… φ

    When your CPU is on the edge of stability, then any error will be visibly quickly in PIFAST as it will start displaying errors.


    ----------200 * 12 = 2400 MHz----------266 * 12 = 3192----------

    ---------49.47 seconds------------37.23 seconds----------

    The GT LCD display showed -54°C. These results in PIFAST were not achievable with mere air cooling, or even water cooling.


    SuperPI is similar to PiFast, let’s see how our overclocked 4000+ handles it

    ----------200 * 12 = 2400 MHz----------266 * 12 = 3192----------

    ---------34.562 seconds------------25.984 seconds----------


    ----------200 * 12 = 2400 MHz----------264 * 12 = 3169----------

    ---------40 min 45 sec------------32 min 50 sec----------

    let's see if the extra CPU power gives us a boost in games and 3D benchmarks ->
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