Looking at Thermal Reports

(Last edited 5/14/2026)

In the following example, we have a 1200W load on a 1200W power supply.  The +3.3V, +5V and +5VSB rails are maxed out and the remaining load is on the +12V rail.  The input voltage is 100V (lower input voltage means higher input current).  The PSU is placed in a 50°C chamber and the fan is spinning at a maximum of 2147 RPM.

Thermistor Number

Component

Tc Actual

Rated Junction Temp

Tj/Tj Max (%)

101

SQ8

78.73°C

175°C

44.99%

102

SQ4

98.84°C

175°C

56.48%

103

SQ7

70.22°C

175°C

40.12%

104

SQ1

62.49°C

175°C

35.71%

105

T1 case

73.54°C

130°C

56.57%

106

T1 core

78.92°C

130°C

60.71%

107

DQ1

95.30°C

150°C

63.53%

108

DQ2

72.05°C

150°C

48.03%

109

DQ3

75.63°C

150°C

50.42%

110

DQ4

79.48°C

150°C

52.99%

111

C2

72.70°C

105°C

69.24%

112

BD1

111.16°C

150°C

74.11%

113

BD2

110.73°C

150°C

73.82%

114

Q1

109.89°C

150°C

73.26%

115

Q2

95.50°C

150°C

63.67%

116

D11

76.53°C

175°C

43.73%

117

Q4

99.79°C

150°C

66.52%

118

Q3

92.16°C

150°C

61.44%

119

U501

68.62°C

150°C

45.75%

120

LF1

100.10°C

130°C

77.00%

201

LF2

106.03°C

130°C

81.56%

202

L2

102.13°C

130°C

78.56%

203

L1

85.87°C

130°C

66.06%

204

T3

67.86°C

130°C

52.20%

205

L501

61.31°C

130°C

47.16%

206

L101

26.68°C

130°C

20.52%

207

DL1

75.13°C

130°C

57.79%

208

DL2

75.20°C

130°C

57.85%

209

DU1

81.16°C

125°C

64.93%

210

PU1

81.54°C

125°C

65.23%

211

C105

60.51°C

105°C

57.63%

212

C103

67.88°C

105°C

64.64%

213

C102

82.10°C

105°C

78.19%

214

C101

26.37°C

105°C

25.11%

215

R3

120.01°C

170°C

70.60%

216

C509

57.64°C

105°C

54.89%

217

C510

57.20°C

105°C

54.48%

218

Air Inlet

50.89°C

-

-

219

Air Outlet

74.91°C

-

-

220

Ambient

45.51°C

-

-

As you can see, we have a bit of an issue with the temperature of LF2, which is a line filter inductor.  Its high temperature is likely due to its proximity to other components.  The same could be said about the capacitor labeled C102.  While it’s not at 84°C or higher, it’s pretty close.  Ironically, despite these noted high temperatures, we see the bridge rectifiers (BD1 and BD2), which are typically rather hot given the low input voltage, are only between 73.82% and 74.11% of their rated temperature in this model.