HTPC Streacom ZF240 Power Supply Mod

Introduction: HTPC Streacom ZF240 Power Supply Mod

THIS MOD CAN BE USED ONLY WITH 35W INTEL CPU!!!

Streacom has made a wonderfull power supply but it has 2 major flaws

http://www.streacom.com/news-item/zf240-product-an...


Spec Before Mod

Power Output: 240W Combined, 3.3V @ 10A, 5V @ 10A, 5VSB @ 2A, 12V @14A, -12V @ 0.3A
Input Power: 100-240V AC 50/60Hz

Output Connectors: 1 x 20+4 ATX, 1 x 4PIN CPU, 2 x SATA, 2 x MOLEX, 1 x FDD

Spec After Mod

Power Output: 240W Combined, 3.3V @ 10A, 5V @ 10A, 5VSB @ 2A, 12V @14A, -12V @ 0.3A

Input Power: 100-240V AC 50/60Hz Output

Connectors: 1 x 20 ATX, 1 x 4 PIN CPU, 1 x 6 PIN GPU, 2 x SATA

1. There is no 6 pix connector for Graphic Card (Nvidia GTX 960 has a 120W GPU) and if an adapter is used both connectors will end up using same 12V wire which is unable to provide enough current.

The solution is to remove 4 pin connector from 20 + 4 pin connector and use 12V line from it to carry power to GPU together with existing 12V wire from MOLEX (we sacrifice also 2 unused MOLEX connectors)


Step 1: PSU After Rework

2. Cable management is bad.

As soon as PSU is installed in the computer case all wires spread.

Solution.

Rework cable management as final image by grouping wires.

This mod was used in

https://www.instructables.com/id/Silent-Steambox-Ga...

allowing GFX upgrade to Gainward Nvidia GTX 960

http://www.gainward.com/main/vgapro.php?id=960&lan...

!! MOD IS NOT INTENDED TO BE USED WITH OC MODELS WHICH CAN REACH 140W !!

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    3 Discussions

    0
    arend-009
    arend-009

    Question 3 months ago

    Thank you, but isn't it also possible to just connect all 24 pins to the motherboard and use both a sata to molex adapter and a 2x Molex to 6-pin adapter? Or 3 adapters (2x Molex to Molex, 2x sata to Molex, and 2x Molex to 6 or 8-pin) to keep it stable and clean. It provides 75W plus 75W if I'm correct.

    While your solution works, the PCI-e slot is probably only delivering 33 Watts and the modded cables of course the rest (168W max.). Now a 6-pin can carry a maximum of 75W and 8-pin 150W. Thus 75W plus 75W should be enough for the 120W GTX 960. Did you mod it because Molex and SATA use the same lanes and the 12V from the motherboard a seperate one? Maybe so the PSU's internal circuit doesn't overheat. Side question: If that is correct, does the CPU 12V line use the same lane as the 12V motherboard connector or are they seperate too?

    And why is it only possible to use a 35W CPU using this mod? Is it because of the power restriction the GPU gives? Btw, keep in mind that Intels' 35W "T"-line CPU's are 35W in TDP, NOT in Power Consumption.

    And does reducing the 24-pin to just 20-pins motherboard connector affect anything other than just PCI-e power delivery?

    Thank you for your time!

    1
    jerpelea
    jerpelea

    Reply 2 months ago

    Hi
    Here is a simple explanation

    The Molex connector has
    1 wire for 5V
    2 wires for ground
    1 wire for 12V

    The 6 pin adapter has
    3 wires 12v
    3 wires ground
    You should consider that 3 wires are intended to provide stable 75W and all that current will come from 1 wire connected to the PSU so there is a risk of melting the wire.

    All GPUs that I tested use almost no current from the extra 20-4pins but you should test your own card with a Multimeter
    In the meantime I replaced all wires from the PSU and modified it with 2x6 pin connectors to be able to run a newer GPU

    The 35W CPU was limited by my passive cooling capabilities at that time

    Happy modding!

    0
    arend-009
    arend-009

    Reply 2 months ago

    Wow that was a quick reply, thank you! :)
    This clears things up a lot, I'm going to use this method.