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Xigmatek NRP-MC651 PSU


by Grace - 7th March 2009
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Xigmatek NRP-MC651 Testing


Xigmatek NRP-MC651 PSU, 25% load
Voltage Line
Power load (A)
Minimum (V)
Maximum (V)
Delta (V)
3.3V
6
3.342
3.343
0.001
5V
5
4.980
4.985
0.005
12V1
3
12.272
12.271
0.001
12V2
3
12.313
12.317
0.004
12V3
2
12.231
12.237
0.006
12V4
2
12.241
12.247
0.006


Xigmatek NRP-MC651 PSU, 50% load
Voltage Line
Power load (A)
Minimum (V)
Maximum (V)
Delta (V)
3.3V
6
3.339
3.341
0.002
5V
10
4.962
4.971
0.009
12V1
7
12.259
12.263
0.004
12V2
6
12.301
12.312
0.011
12V3
4
12.227
12.233
0.006
12V4
4
12.238
12.246
0.008


Xigmatek NRP-MC651 PSU, 75% load
Voltage Line
Power load (A)
Minimum (V)
Maximum (V)
Delta (V)
3.3V
12
3.334
3.337
0.003
5V
10
4.931
4.952
0.021
12V1
10
12.246
12.252
0.006
12V2
9
12.982
12.990
0.008
12V3
7
12.201
12.213
0.012
12V4
7
12.195
12.209
0.014


Xigmatek NRP-MC651 PSU, 100% load
Voltage Line
Power load (A)
Minimum (V)
Maximum (V)
Delta (V)
3.3V
18
3.333
3.335
0.002
5V
20
4.892
4.914
0.022
12V1
13
12.239
12.248
0.009
12V2
12
12.979
12.985
0.006
12V3
10
12.196
12.208
0.012
12V4
10
12.184
12.199
0.015


Xigmatek NRP-MC651 PSU
, 30-100% Load Voltage Regulation Test

3V
5V
12V1
12V2
12V3
12V4


Xigmatek NRP-MC651 PSU
, Efficiency Graph

Power load
30%
40%
50%
60%
70%
80%
90%
100%
Efficiency
82%
84%
85%
84%
82%
82%
81%
80%


Xigmatek NRP-MC651 PSU, Thermal Performance

Load (%)
25%
50%
75%
100%
Intake temperature (Celsius)
21.4
25.9
30.1
31.2
Exhaust temperature (Celsius)
24.2
29.7
34.5
37.3
Temperature Delta (Celsius)
2.8
3.8
4.4
6.1

The electrical performance of the Xigmatek NRP-MC651 is very good overall. The voltage regulation circuit keeps the 12V rails very stable and appears to be highly responsive, but it could be improved when it comes to the 5V line. Even though the 650W appears to be a little less efficient than its more powerful 850W version, it still reaches a peak efficiency of 85% at typical load and doesn't drop below 80% at maximum load.

Those who enjoy cool running PSUs will certainly love the NRP-MC651. With a temperature delta of just 6.1 Celsius at maximum load it certainly is one of the coolest running PSUs we have ever seen. On the other hand, the sensitive thermal controller of the fan is responsible for the great thermal performance of the unit. The fan will spin up very quickly as the load increases, trying to keep the product as cool as possible. Because of that this PSU is silent only up to 50-55% load; at 60% load the fan can be easily heard. And at heavy load (above 80%) the fan is loud.
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