Question: D5 pump....PWM or Fixed speed?

[JPStone]

Just built my first custom loop and have a D5 PWM as my pump.

 

I set it to PWM Auto in BIOS and it runs at 30% until I reach above 40C then will ramp up accordingly until it hits 100% at 70C.

 

I have noticed though that since the CPU temp will sometime rapidly fluctuate between 30C and 40C the pump is almost always revving up and then back down. Then noise doesn't bother me as its going from like 30%-50% and then back down to 30% so still not super loud but my concern is that the constant speed change will wear the parts faster?

 

Would it be better if I say just manually set it to like 50% or 60% and left it like that? Will the constant speed change wear the pump faster or cause damage to it?

 

Any thought or tip or information is much obliged

[daimonie]

1 hour ago, JPStone said:

Just built my first custom loop and have a D5 PWM as my pump.

 

I set it to PWM Auto in BIOS and it runs at 30% until I reach above 40C then will ramp up accordingly until it hits 100% at 70C.

 

I have noticed though that since the CPU temp will sometime rapidly fluctuate between 30C and 40C the pump is almost always revving up and then back down. Then noise doesn't bother me as its going from like 30%-50% and then back down to 30% so still not super loud but my concern is that the constant speed change will wear the parts faster?

 

Would it be better if I say just manually set it to like 50% or 60% and left it like that? Will the constant speed change wear the pump faster or cause damage to it?

 

Any thought or tip or information is much obliged

I've set the PWM profile so that it doesn't do that as much. I've looked at my temperatures under different daily loads (browsing, gaming, working) and set the profile at mostly flat levels for these. So while it transitions from one load to the other it revs, but it doesn't rev during a workload. 

[SolarNova]

I personaly use a D5 vario. have it fixed at setting 5 (max). Not noisy.

 

Remember D5's were originaly designed for 'industrial' use. They are pritty durable and can be run at their max speed for their entire rated lifetime which is many thousands of hours so long as ur running a suitable coolant.

[Woyta]

D5 vario. 3 or 4. Depends on configuration of loop. 5 is noisy for me.

[Blai5e]

I have mine (D5 PWM) set to 40% for daily use; f I'm benching, 60%.

 

Quote

I set it to PWM Auto in BIOS and it runs at 30% until I reach above 40C then will ramp up accordingly until it hits 100% at 70C.

If your coolant manages to hit 70°C, something is amiss!

[Turtle Rig]

Nice posts my gurus.  You always wanna do PWM and slow down the fan or fans for quiet operation and effective.

[AnonymousGuy]

Constant speed, flowrate doesn't really affect temperatures at all once you get past speed 2 (out of 5).

[Mick Naughty]

I never run my pumps at max. Unless it’s for benchmarking/overclock testing. 

 

Too loud for me. 

 

One rig is set at 40% fixed. The other goes from 40-70% with the fans based on temps.

 

prefer fixed unless I have a restrictive loop, which I don’t anymore so I take the extra 3-5c hit. 

[JPStone]

10 hours ago, Blai5e said:

I have mine (D5 PWM) set to 40% for daily use; f I'm benching, 60%.

 

If your coolant manages to hit 70°C, something is amiss!

HMMM. I have been stress testing my Ryzen 7 2700X with the EK Velocity water block and I am hitting 70C in softwear temp anyway. I seem to be stable but every time I run AIDA64 stress test everything runs fine. Pump spins up to max and everything seems fine temp wise but every time without fail at the 15 minute mark I get a Hardware error alert or BSOD. T junction for 2700X is 85C and I have seen temps in softwear pop up to 80C briefly and then back down to 70C-75C. It always between 14 and 15 minutes in the AIDA64 test. Im not runnign an overclock persay either. I have auto tuning turned on the ASUS Prime X470 MoBo on my rig. 

 

I mean I can game and do whatever. Run benchmarks and no issues its just prolonged stress testing sometihing is wonky and I suspect it may be thermal related. Wish AIDA would tell you what the error was.

 

ASUS Prime X470

Ryzen 7 2700X

GSKILL Trident Z RGB CL16 @ 3200

GTX 1080 FE

Custom Loop GPU&CPU 240mm rad

1TB Samsung 860 EVO

Corsair RM 850x 850W PSU

[Blai5e]

Sorry, I think we're mixing temperature sources here... I'm referring to coolant temperatures and you seem to be talking CPU package/core temperatures. Best practice would have you running your radiator fan based off the coolant temperature and not the CPU (all fans in my case are based off my coolant temperature including the rear exhaust). CPU's these days have a habit of quickly ramping up and down causing the fans to follow suit. Also, AIDA64 is a bit of a heat virus and is not really representative of a real world workload. What are your temperatures when gaming would be more what I'd be looking at for reference. In addition, a second radiator wouldn't hurt either.

[JPStone]

1 minute ago, Blai5e said:

Sorry, I think we're mixing temperature sources here... I'm referring to coolant temperatures and you seem to be talking CPU package/core temperatures. Best practice would have you running your radiator fan based off the coolant temperature and not the CPU (all fans in my case are based off my coolant temperature including the rear exhaust). CPU's these days have a habit of quickly ramping up and down causing the fans to follow suit. Also, AIDA64 is a bit of a heat virus and is not really representative of a real world workload. What are your temperatures when gaming would be more what I'd be looking at for reference. In addition, a second radiator wouldn't hurt either.

Gaming temps are fine maybe 40C high end for the CPU Package. Coolant temp is around 30C-35C measured with laser thermometer. Yea always looking to improve next upgrade will be a bigger case and a larger rad or second rad

[jasonvp]

Both of the pumps in my system are running at constant speed.  Somewhere around 50-60%; the GPU pump has to push a lot more water through way more stuff, so I think it's running a hair faster than the CPU pump is.  Either way, neither are variable.  They and the fans stay at a fixed speed.

 

Niiiiiiice and quiiiiiiiet.

[SolarNova]

10 hours ago, JPStone said:

HMMM. I have been stress testing my Ryzen 7 2700X with the EK Velocity water block and I am hitting 70C in softwear temp anyway. I seem to be stable but every time I run AIDA64 stress test everything runs fine. Pump spins up to max and everything seems fine temp wise but every time without fail at the 15 minute mark I get a Hardware error alert or BSOD. T junction for 2700X is 85C and I have seen temps in softwear pop up to 80C briefly and then back down to 70C-75C. It always between 14 and 15 minutes in the AIDA64 test. Im not runnign an overclock persay either. I have auto tuning turned on the ASUS Prime X470 MoBo on my rig. 

 

I mean I can game and do whatever. Run benchmarks and no issues its just prolonged stress testing sometihing is wonky and I suspect it may be thermal related. Wish AIDA would tell you what the error was.

 

ASUS Prime X470

Ryzen 7 2700X

GSKILL Trident Z RGB CL16 @ 3200

GTX 1080 FE

Custom Loop GPU&CPU 240mm rad

1TB Samsung 860 EVO

Corsair RM 850x 850W PSU

Are your running the Aida64 test with 'stress FPU' enabled ?

Its probably the AVX instruction set , which is much heavier on the CPU, this is why Intel CPU's tend to have a AVX offset multiplier in the bios, to downclock the CPu when AVX instrucitons are used.

 

[JPStone]

On 3/4/2019 at 5:15 AM, SolarNova said:

Are your running the Aida64 test with 'stress FPU' enabled ?

Its probably the AVX instruction set , which is much heavier on the CPU, this is why Intel CPU's tend to have a AVX offset multiplier in the bios, to downclock the CPu when AVX instrucitons are used.

 

Yea I was so that could have very well been the case.