New custom loop, high temps.

Discussion in 'Extreme and Water Cooling' started by Dave, Mar 18, 2019.

  1. Dave

    Dave Member

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    Just moved from a NH-D14 over to a custom loop, EK Coolstream PE 360 rad, with Noctua NF-F12 industrial (3000rpm) fans, D5 pwm pump, EK velocity CPU block, in a Define R6.
    Ryzen 2700 @3.8ghz 1.325v. Ambient temp 24c
    Idle CPU temp 33c, rad fans 600rpm, pump 4750rpm (pwm 100%)
    Prime95 (Small FFTs), Max CPU temp, 66c, rad fans 2000rpm, pump 4750rpm (pwm 100%)

    With the NH-D14 max CPU temp was 76c, I was expecting better out of this loop, have double checked the CPU mounting, heatsink paste (hydronaut) looks fine. Run it for a few hours, pretty sure I've got all the air out.

    Any ideas what to try next, or am I just expecting to much?

    Thanks.
     
  2. havabeer

    havabeer Member

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    Isn't the boost clock of that cpu 4.1mhz?
     
  3. OP
    OP
    Dave

    Dave Member

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    Yep, but I have that disabled.
     
  4. Ratzz

    Ratzz Member

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    I think you are expecting too much personally. You have a 10°C drop over a D14, one of the best coolers in the business. That's a pretty decent improvement. Water is good, but it isn't magic.
     
  5. self_slaughter

    self_slaughter Member

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    Yeah, I think you're expecting too much out of it. That's a good drop.

    When you start pushing high voltages etc. water shows its strengths as it doesn't get overwhelmed so easily.
    At low voltages, its good, but not gunna halve your temps or something compared to a monster like a d14.

    It is like magic on GPUs though, with those big dies in direct contact with the water block. oooh baby :weirdo:
     
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  6. Plonkflopped

    Plonkflopped Member

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    Nvm. Read your post again and I'm wrong.
     
  7. OP
    OP
    Dave

    Dave Member

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    Thanks for the replies everyone.
    Made a few changes, now running.
    Idle CPU temp 32c, rad fans 550rpm, pump 1250rpm (pwm 25%)
    Prime95 (Small FFTs), Max CPU temp, 66c, rad fans 1500rpm, pump 2600rpm (pwm 50%)
     
  8. m3k

    m3k Member

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    add more RADDDD - i had a 1080rad on the back of my case once- my CPU never could get above ambient- those were the days.
     
    SomeBoredGuy and mad_mic3 like this.
  9. Kaine[zof]

    Kaine[zof] Member

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    This is actually impossible.

    More rad has diminishing returns. Because thermodynamics. Unless you're running some crazy hot cpu/overclock, any more than 360 is going to see very little difference in temps as you will start to be limited by the ability of the block to conduct heat away from the CPU.
     
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  10. melon

    melon Member

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    You can add two 360s in the R6. The ryzen 8 core uses a bit of heat at load. My 1800x under water is around the same, funny I also expected a better improvement moving from a d14 lol. The bonus is that you can run the fans/pump low rpm.

    As self_slaughter said GPU's under water are awesome. Should give you much more headroom for OC
     
  11. Pazzu

    Pazzu Member

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    There really isn't much you can do unless you want to start lapping. Even then you would only be seeing 1-2 C drops. Direct die would ultimately give you the best, albeit with extremely high risks.
     
  12. radeon_freak

    radeon_freak Member

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    Lapping days have come and gone unless you will be doing both the IHS and block.

    Majority (if not all) today's blocks are intentionally made with a slight convex shape on the heat block. Been this way for some time now.

    Haven't purchased a new block in some time but EK used to (don't think it's changed) ship theirs with different style and thickness jet plates to alter the convex shape. Aquacomputer used to use rubber O rings to achieve the same result and shipped with an alternate if you wanted more/less convex shape.
     
  13. m3k

    m3k Member

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    it was an exaggeration but idle was room temp, and load was like 30ish and would only hit 50s when both GPUS were under load.
     
  14. OP
    OP
    Dave

    Dave Member

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    I'm finding that is pretty common when it comes to water cooling posts. :)

    So I overclocked the 2700 a little bit more to 4.0ghz, which required 1.35v to be 100% stable, which of course raised the temps even more.

    Ambient temp 24c.
    Idle CPU temp 33.5c, rad fans 650rpm, pump 1750rpm (pwm 25%)
    Prime95 (Small FFTs), Max CPU temp, 74.5c, rad fans 1500rpm, pump 4750rpm (pwm 100%)

    I then added an XSPC EX240 Crossflow radiator to the loop, which lowered the temps a bit more.

    Ambient temp 24c.
    Idle CPU temp 32.5c, rad fans 625rpm, pump 1735rpm (pwm 25%)
    Prime95 (Small FFTs), Max CPU temp, 70.5c, rad fans 1500rpm, pump 4750rpm (pwm 100%)

    So from my findings, it seems a single EK PE360 radiator is not sufficient to remove all the heat from a Ryzen 2700 @ 4ghz 1.35v, even with Noctua Industrial fans running at 3000rpm.

    It' shouldn't be case cooling as the temps hardly change when opening the front door, or removing the side panel.
    It doesn't seem to be the CPU block, as adding the second radiator dropped the temp by 4c.
     

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