5900x watercooled behaviour.

qbhatti

qbhatti

qbhatti

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Joined
4 Oct 2021
Posts
184
Location
Uk
Hi

I finally finished my rack based build.
Alpha cool 1080 rad
9 120mm fans at 4.5v (older Yate loons on offer)
Raijintek pump res with d5 pump. Set at 3 as any more then there is a huge vortex sucking in fresh air
Alpha computer cuplex cryos next Vario all nickel
1/2id tubing.


I don't know what to expect..in the olden days the CPU temp stayed fairly static but currently it seems to jump from low 30s to 40s. When at load it gets to early 60s.

Is this normal behaviour or do I have a bad mount or some other deficiency?
 
It's due to the chiplet design concentrating heat into specific areas of the IHS. It's a lot of power going into a tiny area. Ryzen's temperature fluctuates a lot. It's even worse when it's a single CCD chip like the 5800x. I'd say it's normal.
 
Yeah pretty normal
That's why setting your fan curve
(Which may not apply in your case if at a fixed voltage )
to respond to coolant temperature
Rather than cpu temperature
Is useful with these chips
Also seems very hard to get every single core/thread totally idle
To get a true idle reading
My 5950x can jump 30 degrees in an instant
Peaks out around 60c-70c under load
 
Yeah your temps seem good
No need to fiddle
Unless it's with undervolting
Or overclocking
Or curve optimiser etc

Assuming 3 is 3 of 5 so 60% pump speed.?
Could be because you are using one
Large radiator instead of 3 x 360mm like some of us
That may mean using less 90 degree fittings
So may be a fair bit less restrictive giving higher flow
May also be down to which port you're
Returning to the res
Or combination of both of those
 
correct me if I'm wrong but aren't these cpus certified for 95C by AND themselves anyway? so anything below 80-90 is fine anyway and wouldn't throttle? I know that's the case with my 5700x, but I haven't really looked into the 5900x, I know the 5800x is the same as mine in terms of the 95c limit though.
 
Perfectly fine to run at 60%
If temps are good
After a certain rpm the temperature gains
Will be minimal adding more rpm anyway

@Removed User 345456
Yeah newer cpus
Are meant to push it as hard as they can
But with custom watercooling
Wouldn't expect it to be running near 95c
Even if the manufacturers say its fine
Unless you're severely overclocking to the absolute limit
Or running extreme stress tests
That don't reflect real life use
 
Mcnumpty2323 said:
Perfectly fine to run at 60%
If temps are good
After a certain rpm the temperature gains
Will be minimal adding more rpm anyway

@Removed User 345456
Yeah newer cpus
Are meant to push it as hard as they can
But with custom watercooling
Wouldn't expect it to be running near 95c
Even if the manufacturers say its fine
Unless you're severely overclocking to the absolute limit
Or running extreme stress tests
That don't reflect real life use
Click to expand...
To be honest these days air coolers are pretty good like my
Peerless Assassin 120SE that beat the top tier stuff.
So there seems to be less head room these days gain wise
with watercooling.
I tried to space my reply out for you, as I have a bad habit
of writing too much :) So it was done out of respect :)
I hope it comes across that way, happy to do so if it helps :)
 
Last edited:
Removed User 345456 said:
To be honest these days air coolers are pretty good like my
Peerless Assassin 120SE that beat the top tier stuff.
So there seems to be less head room these days gain wise
with watercooling.
I tried to space this reply out similar to your reply, as I have
a bad habit of writing too much :) So it was done out of respect :)
Click to expand...
Yeah for the money
The peerless assassin is a fantastic cooler

With the very top end cpus now
It's getting to the point where at least an AIO
Is required
Something like a 7950x
And a rtx4090 the power draw is crazy
Full watercooling still gives good benefits on the gpu
But it's getting harder to see where new cpus and gpus
Will still be able to get faster
But not draw crazy amounts of power

Thanks for that
Most of the guys are pretty used to
My weird typing style by now
I always say as long as what I post
Is helpful
Shouldn't really matter if my typing is weird lol
 
Mcnumpty2323 said:
Yeah for the money
The peerless assassin is a fantastic cooler

With the very top end cpus now
It's getting to the point where at least an AIO
Is required
Something like a 7950x
And a rtx4090 the power draw is crazy
Full watercooling still gives good benefits on the gpu
But it's getting harder to see where new cpus and gpus
Will still be able to get faster
But not draw crazy amounts of power

Thanks for that
Most of the guys are pretty used to
My weird typing style by now
I always say as long as what I post
Is helpful
Shouldn't really matter if my typing is weird lol
Click to expand...
Yeah I was shocked when I got it, as I originally
wanted the Dark Rock Pro 4 or NH-D15, but
this turned out to be way better and over half
the price cheaper!

That is true mate, the 5800x3d for example
gets stupidly hot for what it is, that's why I
chose a 5700x in the end, as it is only a 65W
cpu and sips power and never goes above
65C, which means the Peerless Assassin's
fans are barely spinning on my custom PWM
settings :) I love having a cool and near silent
setup :)

Yeah it will be crazy when it becomes
mandatory to have water cooling! it scares
me personally, I have terrible luck, so don't
fancy the risk haha!

You're very welcome my friend, you have
made the effort to write so many posts on
here, which help a lot of people, so I think
everyone should reply to you just the same,
it doesn't take much longer to press Return
a few more times :)

I just read it as if it's a text message with
the width of the phone screen, where you
cant fit as many words per line vs width of
the phones screen :)

I think it's awesome you've managed to
work around this issue and be so active
on here, I love that attitude to life, let
nothing stop you! I'm like that with various
issues I have, I use what normally would
be angry/upset/disappointment, as a way
to motivate myself, I also get a hell of a
kick out of proving someone wrong if
they claim I cant do something or act
negative, especially when it's out of
bitter jealousy!

Anyway I'm rambling, haha! See I
told you I ramble!
 
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qbhatti said:
I have two 45s going into the rad at the bottom and no 90s.
So it's ok to run it at 60pc?

Thanks for all the help.
Click to expand...

You can test this yourself, run a stress test and try the pump at different speeds. I'd suggest starting at 100% and just nudging it down in 5% increments to find where the diminishing returns are for temperature vs %. You'll find there is a speed where the temperature levels out and doesn't really get that much benefit from the extra %. For my loop with it's various components it's around 55 to 60% under load to stop the processor cores or GPU being hotter than they need to be, so I run it at 30% when just dawdling on the desktop and bring it up to 60% when I'm stressing the computer and the water temperature increases.
 
Last edited:
Parsley said:
You can test this yourself, run a stress test and try the pump at different speeds. I'd suggest starting at 100% and just nudging it down in 5% increments to find where the diminishing returns are for temperature vs %. You'll find there is a speed where the temperature levels out and doesn't really get that much benefit from the extra %. For my loop with it's various components it's around 55 to 60% under load to stop the processor cores or GPU being hotter than they need to be, so I run it at 30% when just dawdling on the desktop and bring it up to 60% when I'm stressing the computer and the water temperature increases.
Click to expand...
Yeah that's how I do it
Though they don't have pwm control
Just a selector on the pump for 1,2,3,4,5
So 20%,40%,60%,80%,100%
Is all that's available
And need to physically switch it which may be
Difficult depending where the pump is
 
Mcnumpty2323 said:
Yeah that's how I do it
Though they don't have pwm control
Just a selector on the pump for 1,2,3,4,5
So 20%,40%,60%,80%,100%
Is all that's available
And need to physically switch it which may be
Difficult depending where the pump is
Click to expand...
Ah I didn't see about lack of pwm control. Still, not a bad range!
 
Thanks folks..the problem is that anything beyond around 3 (and it's not stepped, more of a standard variable resistor like an old school wall dimmer switch) gives me lots of air noise as the vortex goes through the bottom tubey not that's in the res and I think sucks air back into the loop.
 
So the res has a tube poking into the res from the bit where you put the water in (at the top ) and also one at the bottom of the res (in the middle, I think where it sucks the water to push it out ).

Is this what you mean by a protector
 
qbhatti said:
So the res has a tube poking into the res from the bit where you put the water in (at the top ) and also one at the bottom of the res (in the middle, I think where it sucks the water to push it out ).

Is this what you mean by a protector
Click to expand...
Usually an anti vortex
Is like a square piece of plastic you insert
Or even think have seen a foam one

Returning into the top of the reservoir Usually helps
With vortex A bit though
But if you don't have multiple top ports
You then need to add a T or Y piece etc
So you can still fill from the top
The tube coming in from the top
Stops splashing and air bubbles as its lower
Than the returning coolant
If you choose to return into the top
To be fair the fact you're still getting a vortex
Shows how little flow resistance you're getting
 
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