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Alphacool VPP655 Low/Medium/ or high Rpm?

Discussion in 'Overclocking & Cooling' started by Knoxx29, Jul 20, 2014.

  1. Knoxx29

    Knoxx29

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    Hi everyone
    I have this pump
    image.jpg
    The velocity of this pump can be adjustable from 1000rpm up to 5000rpm and I am
    Wondering at how many rpm should a pump run?

    Every advice will be really appreciate it..
    Thanks
     
  2. sneekypeet

    sneekypeet Unpaid Babysitter Staff Member

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    Run three or four ranges of speed with some sort of a stress test and see if increasing the speed offers any benefit or if a lower speed is sufficient for best thermal performance. Every loop is different, so where I may find full speed is needed for efficiency, you may not need as much to get the best results. Sometimes too much pump speed can hurt thermals as well! ;)
     
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  3. Knoxx29

    Knoxx29

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    D
    does it matter the amount of radiators that I have?
     
  4. eidairaman1

    eidairaman1

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    i would say the more radiators the faster youd want the flow to run to make it through those rads
     
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  5. sneekypeet

    sneekypeet Unpaid Babysitter Staff Member

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    ^ what he said. I usually found that the res can play up at times too with too much speed as it will cause air to cycle through, not just fluid. As I said, try it out, if it works at full speed, have at it!
     
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  6. Knoxx29

    Knoxx29

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    Should I use prime 95 to stress the system?
     
  7. erocker

    erocker Super Moderator Staff Member

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    Whatever loads your system and generates heat will work.
     
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  8. Knoxx29

    Knoxx29

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    Thanks, I just started a 15 minutes prime 95 stress test
     
  9. Knoxx29

    Knoxx29

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    My theory was more radiators more faster the pump should it runs
     
  10. eidairaman1

    eidairaman1

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    Well you gotta be able to get fluid in those separate rads quick enough to gain a heat reduction
     
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  11. Knoxx29

    Knoxx29

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    Test done, the pump was tested at 2000rpm, 3000rpm, 4000rpm and 5000rpm and I didn't notice any benefits temperatures were always the same 68 degrees at full load
     
  12. sneekypeet

    sneekypeet Unpaid Babysitter Staff Member

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    this is what I was saying, no need to push it that fast if its not needed. Could extend the life of the pump as well as less noise and vibration;)
     
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  13. Knoxx29

    Knoxx29

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    Something to correct, i will leave it at 2000rpm because I saw that temperatures were 66 and rarely for a couple of seconds 68, for me it's still a little weird That at lower speed with 2 radiators i get 2 degrees less than at higher speeds:rolleyes:
     
    Last edited: Jul 20, 2014
  14. sneekypeet

    sneekypeet Unpaid Babysitter Staff Member

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    I have found that sometimes more speed from the pump will counteract the radiator....IE the water is passing to fast to be efficiently cooled.
     
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  15. HumanSmoke

    HumanSmoke

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    Probably a case of diminishing returns. Higher RPM means the pump generates more heat which it dumps into the coolant it is circulating. Typically a (12V) D5 uses ~13 to 35W depending on rotor speed. For a happy medium I might suggest a quick browse of one of the more comprehensive watercooling testbenches around (Martins Liquid Lab). The Koolance PMP-450 is just another rebranded Laing D5 (as is the Alphacool, as well as any number of Swiftech MCP655, EK, Danger Den, Phobya models etc.)
     
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  16. Knoxx29

    Knoxx29

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    Thanks a lot for the link, I learned a couple of things of it...
     
  17. Knoxx29

    Knoxx29

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    l has spent more than EUR 600 for my entire setup watercooling and last week I ordered some additional components in order to watercool GPU too ( so far around 800 euro+) and that is why I try to get the best performance of my watercooling, before I decided to build a system of WC I was reading around and learning as much as possible, although I missed some points I still got what wanted and i am really happy with all the goals that I have achieved so far and each time I make an improvement to my watercooling system that's a big satisfaction for me..
     
  18. sheltin

    sheltin New Member

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    more water blocks you have more pressure (head pressure) you need so more rpm, most restrictive part of your water loops are your blocks!

    I have 3 radiator's 's all 65mm thick (240,360,360) thicker the rad the slower the water travels through the rad! The more heat exchange you get! (1/4 coolant and 3/4 distilled water for me) but!! the slower the water passes through your water blocks (Cpu/Gpu's) the less heat transfer your get so higher temps so its a trade off if you have thin radiator's and lots of blocks

    that's why my 980's are in parallel (not in series) less restriction after the Cpu!
    they don't put out as much heat as my (4930k at 4.5Ghz) and they both still run 8 degrees cooler than the Cpu even though they are after the Cpu

    I have done tests with my fans on manual (constant speed) and room well ventilated I stress tested both Gpu's and Cpu at same time (furmark&prime95) at 5000rpm pump speed until temps stopped climbing about 15/20 min I worked my way back down 500 rpm at a time stressed for 15min I saw no temps climb until I reached 3500 rpm I climbed 1 degree across my Gpu's! Nothing on Cpu...... this is where my previous statement comes in! the slower the water passes through your water blocks (Cpu/Gpu's) the less heat transfer your get so higher temps I started losing to much water flow through my Gpu's because they are in parallel they get half the flow of the Cpu I continued to drop the rpm's once I got to 2000 rpm my Cpu temps started rising!! any less than 2000 rpm is just plan stupid in my opinion for this pump!

    I have settled for 2500 rpm on the pump its not noisy it efficient and I will get a lot of hour out of the pump!

    at 5000 rpm the pump draws a lot of power the motherboard header never read true 5000 rpm but 4750 rpm it also dropped my 12v rail down to 11.8 volts something to be mined full about too I have a 1000w power supply so no problem there

    Never use straight radiator coolant you will get bad temps believe me

    any question just email me at: sheltin@live.com.au
     
    Last edited: Jun 18, 2016
  19. Toothless

    Toothless

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    Dude the thread is two years old.
     
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  20. Caring1

    Caring1

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    @Knoxx29 do you still have this pump and how's it performing now after 2 years?
     
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  21. sheltin

    sheltin New Member

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    yes it is but still shows up on google
     
  22. Knoxx29

    Knoxx29

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    Ask @RCoon how is performing :laugh::laugh:
     
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  23. RCoon

    RCoon Gaming Moderator Staff Member

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    Like a rock. Don't usually run it beyond speed 2 of 5 for silence purposes.
     
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  24. Knoxx29

    Knoxx29

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    Soon I'll build a Watercooled Machine and I will buy one of those once again, it's a great Pump.
     

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