As we witnessed with the Core Edition 450W, the +12V rail starts off slightly high and then goes up as the load increases. As the load on the +3.3V and +5V increase, the +12V rail increases as well. Not until there is a substantial load on the +12V rail without putting a load on the non-primary rails does the +12V act "normally". For efficiency, we see that this unit is spot on with 80 Plus Bronze by getting 82%, 85% and 82% efficiencies at 20%, 50% and 100% loads, respectively.
Now let's see how this unit acts when it's hot:
XFX PRO 550W HOT load tests
Test #
+3.3V
+5V
+12V
+5VSB
DC Watts/ AC Watts
Eff.
Power Factor
Intake/ Exhaust
Simulated system load tests
Test 1
1.6A
1.6A
3A
1.3A
56.2W/ 73.7W
76%
.97
21°C/ 23°C
3.39V
5.01V
12.13V
5.02V
Test 2
3.1A
3.1A
6.5A
1.3A
111W/ 134.2W
82%
.99
23°C/ 25°C
3.39V
4.99V
12.15V
5.01V
Test 3
4.7A
4.7A
10A
1.3A
167W/ 197.4W
85%
.99
25°C/ 28°C
3.38V
4.97V
12.16V
5.01V
Test 4
6.3A
6.3A
13.5A
1.3A
222.8W/ 262W
85%
.99
27°C/ 32°C
3.37V
4.95V
12.17V
5.01V
Test 5
7.8A
7.8A
17A
1.3A
277.9W/ 326.6W
85%
.99
29°C/ 35°C
3.37V
4.94V
12.18V
5.00V
Test 6
9.4A
9.4A
20.5A
1.3A
333.7W/ 394.6W
84%
.99
30°C/ 36°C
3.36V
4.91V
12.20V
5.00V
Test 7
12.5A
12.5A
27.5A
1.3A
443.1W/ 531.9W
83%
.99
32°C/ 39°C
3.34V
4.87V
12.22V
4.98V
Test 8
15.7A
15.7A
34.5A
1.3A
555.6W/ 676W
82%
.99
34°C/ 43°C
3.33V
4.83V
12.24V
4.97V
Test CL1
15.6A
15.6A
2A
0A
151.7W/ 193.3W
78%
.99
28°C/ 33°C
3.36V
4.75V
12.57V
5.03V
Test CL2
0A
0A
44A
0A
503.4W/ 603W
84%
.99
33°C/ 41°C
3.36V
5.24V
11.47V
5.02V
As with the 450W, the fan became quite audible when the intake temperatures hit nearly 30°C. None of our other numbers really changes substantially between this testing session and the last.
And also, as with the 450W, the ripple and noise are well under control:
Oscilloscope Measurements for XFX Pro 550W
Test #
+3.3V
+5V
+12V
+5VSB
Test 1
Test 2
Test 3
Test 4
Test 5
Test 6
Test 7
Test 8
Test 9 (CL 1)
Test 10 (CL2)
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