Moving Celeron G3900 to the Smallest Micro-ATX Case: Jonsbo C2


The computer case for my Celeron G3900 has 4 fans. Air circulation is great but it is too big to fit on the table. I want to move it to a smaller case and keep cool.

  1. Background Information
  2. Requirement
  3. Evaluation
  4. Decision
  5. Special Topics
A Micro-ATX in Jonsbo C2
Jonsbo C2 is smaller than some Mini-ITX cases but accepts a Micro-ATX motherboard.

Background Information

Working Table

I usually work on the dining table TÄRENDÖ[1] which is 67 x 110cm. There is a table lamp on the left, a 27″ BenQ EW2740 on the 67cm x 110cm monitor stand in the center, and stationery on the right. The rest is my working area that is 45 x 110cm.

When it’s time to eat, the keyboard is pushed back under the monitor stand and everything in the working area would be removed. All dinner plates are served in the working area.

The Celeron G3900 Computer

The Celeron PC uses the SuperChannel GC03[2]. It is a 36 x 26.7 x 33.3cm Micro-ATX case and comes with four 12x12cm fans. The power supply has a dedicated tunnel at the bottom and there is 1 intake fan at the front. Another 2 intake fans bring air to the motherboard/CPU and the other exhaust RGB fan at the back pulls heat away.

The Micro-ATX motherboard “msi H110M PRO-VH” is 23.5 x 18cm.

Power is provided by Channel Well Technology’s “CWT SF300W”. It is an ATX PSU without “80 Plus”[3] certified.

Power Consumption

31 ~ 50W with CWT SF300W at the wall for my scenarios[4].

Requirement

  1. The PC needs to be less than 28cm depth and 25cm width.
  2. Shorter than the monitor on the stand. About 50cm height.
  3. No RGB fan or lightbar. They are distracting me.
  4. Power consumption should be less than 50W for general usage.
  5. System temperature should be less than 50°C for general usage.
  6. The CPU and case fans need to run quieter than my air purifier.
  • Seagate suggests the operating temperature range for a hard drive is between 5 ~ 50°C[5].

Evaluation

Case

Jonsbo C2[6]

Size: 22.4 x 20 x 26.2cm
Fans: An optional 12/14cm fan at the bottom
Motherboard: Micro-ATX within 24.5 x 21.5cm/Mini-ITX
Power Supply: ATX or SFX[7] with an SFX to ATX converter

Pros:

  1. Accept a Micro-ATX motherboard within 24.5 x 21.5cm.
  2. The smallest case within requirements.

Cons:

  1. Very few Micro-ATX motherboards are within the limits.
  2. Too crowded for an ATX switching power. Difficult to manage cables.
  3. Although an SFX is a better fit, it’s more expensive than an ATX.
  4. Additional expense on a fan.
  5. There is no fan to pull the accumulated heat away.

SilverStone Sugo SG05[8]

Size: 27.6 x 22.2 x 17.6cm
Fan:  A 12cm fan at the front
Motherboard: Mini-ITX
Power Supply: SFX

Pros:

  1. Come with a 12cm intake fan at the front.
  2. Size within the requirements.

Cons:

  1. Accept Mini-ITX motherboard and SFX power only.
  2. Mini-ITX motherboards are usually more expensive than Micro-ATX.
  3. SFX powers are more expensive than ATX.
  4. There is no fan to pull the accumulated heat away.

Cooler Master MasterCase H100[9]

Size: 27.8 x 21.6 x 29.4cm
Fan: A 20cm RGB fan at the front
Motherboard: Mini-ITX
Power Supply: ATX or SFX with an SFX to ATX converter

Pros:

  1. Come with a 20cm intake RGB fan at the front.
  2. The fan can be changed to 12/14/20cm models.
  3. Size within the requirements.

Cons:

  1. Accept Mini-ITX motherboard only.
  2. Mini-ITX motherboards are usually more expensive than Micro-ATX.
  3. There is no fan to pull the accumulated heat away.
  4. The RGB fan is distracting.

Cooler Master Elite 110[10]

Size: 28 x 26 x 20.8cm
Fan: A 12cm fan at the front and optional two 8cm fans on the side
Motherboard: Mini-ITX
Power Supply: ATX or SFX with an SFX to ATX converter

Pros:

  1. Come with a 12cm intake fan at the front.
  2. The front fan can be changed to 12/14cm models.
  3. Size within the requirements.
  4. Up to three fans to improve air circulation.

Cons:

  1. Accept Mini-ITX motherboard only.
  2. Mini-ITX motherboards are usually more expensive than Micro-ATX.
  3. Additional expense on 8cm fans on the side to pull the accumulated heat away.

SilverStone Sugo SG13[11]

Size: 28.5 x 22.2 x 18.1cm
Fan: A 12cm fan at the front
Motherboard: Mini-ITX
Power Supply: ATX or SFX with an SFX to ATX converter

Pros:

  1. Come with a 12cm intake fan at the front.
  2. The front fan can be changed to 12/14cm models.

Cons:

  1. Too big to fit.
  2. Accept Mini-ITX motherboard only.
  3. Mini-ITX motherboards are usually more expensive than Micro-ATX.
  4. There is no fan to pull the accumulated heat away.

Jonsbo V4[12]

Size: 29 x 23.8 x 27.8cm
Fan: Optional three 8cm fans at the back
Motherboard: Micro-ATX within 24.5 x 24.5cm/Mini-ITX
Power Supply: ATX or SFX with an SFX to ATX converter

Pros:

  1. Accept a Micro-ATX motherboard within 24.5 x 24.5cm.
  2. Up to three fans to improve air circulation.

Cons:

  1. Too big to fit.
  2. Additional expense on 8cm fans at the back to pull the accumulated heat away.

CFI-A8989GB[13][14]

Size: 30 x 20 x 17cm
Fan: A 8cm fan at the back
Motherboard: Mini-ITX
Power Supply: Build-in customized 150W

Pros:

  1. Come with an 8cm fan to pull the accumulated heat from the case at the back.

Cons:

  1. Too big to fit.
  2. Dust would be sucked in due to the negative air pressure.
  3. The customized power supply is difficult to repair and replace.

PSU

Model Type Fan (cm) Size (cm)
W-H-D
Efficiency
%
@ 115V
FSP
HEXA 85+ 350W[15]
ATX[16] 12 15 x 8.6 x 14 79 @ 10% Load
84 @ 20% Load
86 @ 50% Load
SilverStone
ST30SF V2.0[17]
SFX[18][19] 9.2 12.5 x 6.35 x 10 82 @ 20% Load
85 @ 50% Load
Protection FSP
HEXA 85+ 350W
SilverStone
ST30SF V2.0
over current protection (OCP)
over voltage protection (OVP)
short circuit protection (SCP)
over power protection (OPP)
over temperature protection (OTP)
under voltage protection (UTP)

Comparison:

  1. ATX is too crowded to use with Jonsbo C2.[20][21]
  2. ATX looks fine with Cooler Master MasterCase H100[22] and other cases.
  3. HEXA 85+ provides better low load efficiency than ST30SF.
  4. ST30SF comes with a free ATX adapter bracket.
  5. The ST30SF V1.0 featured a semi-passive fan controller while the V2.0 is always on.[23]. It’s reported that V1.0 is quite noisy while the fan is running.[24]

Decision

Implementation

  1. Move the G3900, motherboard, and SSD to the new case “Jonsbo C2 Black”.
  2. Use the new “SilverStone ST30SF V2.0”.
  3. Install one “Metallic Gear SKIRON 140MM FAN”[25] as the intake fan at the bottom.
  4. Set the temperature and fan speed in “Hardware Monitor” in BIOS as below:
CPU Level Temperature Fan Speed
1 40 40
2 50 55
3 60 75
4 70 100
SYS Fan1 Level Temperature Fan Speed
1 40 40
2 45 55
3 50 75
4 55 100
  • Issue: both temperature source is fixed to “CPU”. I cannot assign “SYS” to “SYS Fan1”.

Temperature and Power Consumption

Celeron G3900 is always less than 46°C and the PCH is 38°C in my scenario.

At-wall power consumption is 19 ~ 45W, usually less than 36W, with the new SilverStone ST30SF V2.0. It is 31 ~ 50W with the old CWT SF300W.

Special Topics

Power Efficiency

The “80 Plus”[26] certifies power efficiency at the percentage of rated load at 20%, 50%, and 100%. The best is at 50%.

Based on G3900’s power consumption, I have created a table to find out what’s the best PSU power output for it.

G3900
Power Consumption
Required PSU
@ 20% Load
Required PSU
@ 50% Load
19W (Idle) 95W 38W
45W (General Usage) 225W 90W

A 90W PSU is high power efficiency for idle and general usage. 19W is about 8.4% load to a 225W PSU. 8.4% is less than 20% and has lower power efficiency. It means a 225W PSU is high power efficiency for general usage but poor during idle.

Therefore, a picoPSU-90[27] and a 12V 90W power brick together can also do this job.[28] It would perform better during idle than ST30SF.

Air Flow Improvement

I notice the intake air from the bottom almost flow through the vented slot cover (region 3) and around (region 4) immediately. The PSU would suck from region 1 and pull aways through region 2.

The back of Jonsbo C2
An Illustration of back regions of Jonsbo C2.

Therefore, I use some paperboard to change the airflow. To lead the cool air to top and out of the case through regions 1, 3, 4 by the positive pressure.

To improve the air flow
To keep more cold air stay in the case, I use paperboards to improve air circulation.

The experiment fails. The PSU still sucks from region 1. Maybe the fan doesn’t intake enough air or the positive pressure is not enough. Eventually, I use a transparency slide to block region 4 as a temporary solution. It would stop any air go through.

Hacking H110M PRO-VH to Support Coffee Lake

Win-Raid Forum has two threads[29][30] about manually modifying BIOS region[31] to support Coffee Lake. There is also a step-by-step instruction to flash H110M PRO-VH.[32]

Reference

  1. IKEA: Dining Tables: TÄRENDÖ
  2. Super Channel: GC03(B) 小尖兵 RGB
  3. Wiki: 80 Plus: Efficiency level certifications
  4. Add a Fan to Resolve J3455B-ITX’s Heating Issue
  5. Seagate: What is the normal operating temperature for Seagate disk drives?
  6. Jonsbo: C2 Black
  7. SilverStone: List of computer PSU form factors
  8. SilverStone: SG05-LITE
  9. Cooler Master: MASTERCASE H100
  10. Cooler Master: ELITE 110
  11. SilverStone: SG13
  12. Jonsbo: V4 Black
  13. xcom.shop: CFI CBI-A8989GG
  14. dont.ru: CFI CBI-A8989GG MiniITX Black(glare) 150W (12V@9A, 1xHDD 3.5, 1xODD 5.25) P/n: 111958
  15. FSP: HEXA 85+ 350W
  16. Wiki: Power supply unit (computer)
  17. SilverStone: ST30SF
  18. Wiki: ATX: 3.4 ATX power supply derivatives: 3.4.1 SFX
  19. SilverStone: List of computer PSU form factors
  20. SFF.NETWORK: Jonsbo C2 – Sitting In The Middle
  21. Mobile01: [開箱] Jonsbo 喬思伯 C2裝機
  22. Tech PowerUp: Cooler Master Mastercase H100 Review: Assembly
  23. Small Form Factor: SilverStone ST30SF V2.0 and ST45SF V3.0 Review
  24. PTT: [請益] 低噪音的電源供應器
  25. Metallic Gear: SKIRON 140MM FAN
  26. Wiki: 80 Plus: Efficiency level certifications
  27. Ituner Networks: picoPSU-90, 90w output, 12v input DC-DC Power Supply
  28. ars technica: Why is my computer using so little power?
  29. Win-Raid Forum: [TOOL] Easy automated Mod tool for Coffee Lake bios
  30. Win-Raid Forum: [GUIDE] Coffee Lake CPUs on Skylake and Kaby Lake motherboards
  31. SMX DIY: [折腾教程] 关于 LGA1151 魔改上 Xeon 及 8 代 9 代 分享一些经验
  32. ITW01: 《微星H110M PRO-VD刷BIOS支援I3-8100及獨顯亮機》

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