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How to choose a silent fan position for Ryzen 7 in ITX case!

дата September 29, 2020

Why AMD Wraith Prism cooler is terrible should be obvious by now, but you have to understand and measure it! They keep selling it, they even made the LED light on it, and not just any light but configurable via USB, why if even the cheapest tower cooler is better than it! They are trying to sell it for $20 a second hand, although the difference between an oem version and a box version where it comes bundled with a processor is much less, and sometimes box is cheaper than an oem!

My hardware
Processor: AMD Ryzen 7 3700x – 65W TDP, there are also a 7 3800x it is ten percent faster, but in watts it is half that much – 105 watts; my attitude towards watts is like that – they couldn’t do it smartly faster so that’s why they raise voltages adding cooling and durability issues, but they all do it! After 95 degrees, the frequency starts to drop, so you have to cool it down befor 94 degrees.

Motherboard: X570 I AORUS PRO WIFI ITX form factor. X570 chipset with a very strange cooling, from above the fan blows on the M2 disk and below is the heat sink of the chipset itself, whose temperature does not drop below 62 degrees … but does not make noise – that’s the main thing, although probably it will start in half a year.

Case: COUGAR QBX – he’s already old, but well built, short and long and perhaps elegant. They tried to make it cheap so there are a lot of patterned places. The base plate rests on stamped legs and not, as usual, on screwed legs; Therefore, the mother of the X570 I AORUS PRO WIFI with its cooling booster back plate does not fit; one leg had to be cut and bent. The holes for the fans in the case are also stamped, this increases their noise, they could have made twisted grilles, but no. On the front panel, there is a declared space for an 80mm fan, but there are holes for normal case screws, how to fix it? I had to drill a bit for testing.

In the case: Fan DEEP COOL UF 80 80 mm, 900 – 2200 rpm ; friction bearing; a 92mm one would be more suitable (from the same UF series), but it is not available in any store. Air flow 25.13 cfm, noise 18-25 dB, price 9 $ .

Thermal paste: DEEPCOOL Z3

I will create the load with a command in Ubuntu.
stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M --timeout 600s
The processor is 65% loaded, maybe it could have been more, but for testing it’s already enough – it’s already overheating!

Before starting charging, the case heats up to 51 degrees.

In BIOS, the case fan is linked to the CPU temperature sensor

Option 0
AMD Wraith Prism has two operating modes Low and Hight, it spins up to 3000 and 3800 rpm, respectively. In both modes, it sounds good, too good.

Prism is large, it blocks the fan, which should blow air behind the case.

The main problem with the cooler is that it blows on the motherboard, in the graph this is a noticeably higher temperature compared to the tower cooler (CPU1 SYS1). But the graph does not convey how hot the wall is under the motherboard; you can feel it with your cheeks and with the smell of hot tin. In Low mode, we already encounter a CPU slowdown.

I take another cooler
DEEPCOOL GAMMAXX 300 FURY – not present on the manufacturer’s website. 92mm PWM fan, 900-1800rpm; sleeve bearing; backlit; for CPU TDP up to 130 watts (sellers write in the description, there is no this data on the box, there is no indication of watts dissipated at all), and on Ryzen 7 3700x its 65 watts, but something seems to me someone has indicated bad watts! Air flow 40 cfm, noise 18 – 21 dB, price 16 $ . It is important that its height is 130.5 mm, it fits in the COUGAR QBX.

Option 1

The CPU fan blows air from the CPU heat sink into the case fan, which in turn blows it out of the case. As it turned out, this is the most successful option out of three: for CPU temperature and the internals of the case!

Option 2

The CPU fan blows cold air onto the CPU heatsink, but this does not help to reduce its temperature as there is hot air left in the case, the fan above does not help much to remove it and also does not cool the heatsink heat from the CPU, even though it’s close. Most Failed Cooling Option – Better to blow everything out of the case.

Option 3

Almost the same layout as the first version, only I was hoping the fan next to the CPU radiator would help. But no!

In total, the main task is to quickly remove the heat from the radiator outside the case; this allowed the first option, the best of all. Another task is to bring cold air to the CPU fan inside the case, it is difficult to do, but let’s try!

The pipe turned out to be a complete disappointment, not affecting the cooling in any way. We use a pipe with a diameter of 100 mm, aluminum 75 microns. Fixed to the fan with sills. To fix the other side of the tube in the case, I fix it like this: I take an old fan, remove everything, only the case remains and use it to install.

Option 4

The idea is that cold air flows directly to the CPU heat sink improving the cooling of the internal components of the PC, but not

Option 5

The hot air from the CPU is immediately discharged to the outside, but the internal temperature of the case has only gotten worse, and the front panel is noticeably warmer!

I come to the conclusion that the fan of the DEEPCOOL GAMMAXX 300 FURY is very weak, and I want to check the version if you remove it from the radiator, if it will improve the air flow. Now it leans against the radiator, and if there is some space in front of it, the flow should be better. I take a 92mm fan with a fan removed and extend it

Option 6

It didn’t get worse, which means it got better!

Lets put a fan that is more powerful and that costs like the whole DEEPCOOL GAMMAXX 300 FURY, an elite Noctua Premium Fan NF-A9 PWM 92 mm cooler, up to 2000 rpm, noise up to 22.8 dB, price 16 $ .

Option 7

It’s noticeably louder, but a couple degrees cooler … The airflow has intensified, and the noise caused by the nearby radiator!

Option 8
I put back the stock cooler to DEEPCOOL GAMMAXX 300 FURY, it is quite quiet and efficient. And as a case fan I put Noctua Premium Fan NF-A9 PWM, but I do not support it against the grill, I make a gasket of an old 92m fan housing, with a remote fan.

This is a success, it is selenic, just like the best Option 1: Noctua is located far enough away from the case grill not to generate noise, but close enough to the CPU heat sink to suck in the hot air expelled by DEEPCOOL. The graph shows the temperatures of AMD Wraith Prism (Option 0) and Option 1 with an 80mm cooler.

The numbers are excellent, the CPU temperature doesn’t go above 92 degrees so the throttle is definitely not starting. The case fan is tuned to the CPU temperature, so the case temperature drops when the CPU starts to heat up, also because heat is immediately expelled. After removing the load from the CPU, the temperature in the case rises to 52 – normal.

Anyway, I have build a turbine, i can even say that it is cheap and very quiet!

– It is very important to remove hot air from the case.
– Bringing cold air to the CPU is not efficient
– Someone lies about watts or AMD with 65 watts in the CPU, or DEEPCOOL about the capacity to dissipate 130 watts (DEEPCOOL and the stores lie, for their DEEPCOOL NEPTWIN V2, two 120mm fans, 6 tubes, much fatter, only indicate 150 watts)
– To reduce noise from stamped holes for the fan, you can put a gasket from the old fan housing so that it does not immediately rest against the holes.

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