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XFX XTR Series 850W PSU Review

XFX cooperates closely with Seasonic for its PSU products. That's a major advantage, since Seasonic is a top OEM. The XTR line is XFX's second-best, after the XTS family, and today's review focuses on the 850W model.

Load Regulation, Hold-Up Time And Inrush Current

To learn more about our PSU tests and methodology, please check out How We Test Power Supply Units.

Primary Rails And 5VSB Load Regulation

Load Regulation testing is detailed here.

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Hold-Up Time

Our hold-up time tests are described in detail here.

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Measured hold-up time easily exceeds 17ms, and the power-good signal is also higher than 16ms. Moreover, that signal drops before the rails go out of spec.

Inrush Current

For details on our inrush current testing, please click here.

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The inrush current is at normal levels with both voltage inputs.

Load Regulation And Efficiency Measurements

The first set of tests reveals the stability of the voltage rails and the PSU's efficiency. The applied load equals (approximately) 10 to 110 percent of the maximum load the supply can handle, in increments of 10 percentage points.

We conducted two additional tests. During the first, we stressed the two minor rails (5V and 3.3V) with a high load, while the load at +12V was only 0.10A. This test reveals whether a PSU is Haswell-ready or not. In the second test, we determined the maximum load the +12V rail could handle with minimal load on the minor rails.

Test #12V5V3.3V5VSBDC/AC WattsEfficiencyFan Speed RPMFan Noise dB(A)Temps In/OutPF/AC Volts
15.199A1.983A1.970A0.979A84.7586.50%80532.538.23 °C0.969
12.153V5.038V3.345V5.096V97.9841.63 °C115.1V
211.429A2.968A2.960A1.176A169.6290.03%80532.538.85 °C0.992
12.145V5.036V3.341V5.086V188.4042.53 °C115.1V
318.021A3.476A3.471A1.374A254.7890.97%107035.839.52 °C0.980
12.137V5.034V3.339V5.074V280.0843.51 °C115.1V
424.612A3.972A3.953A1.575A339.6891.00%147547.741.15 °C0.982
12.129V5.034V3.336V5.065V373.2645.64 °C115.1V
530.864A4.968A4.950A1.781A424.5690.65%191551.141.81 °C0.986
12.120V5.031V3.332V5.054V468.3347.13 °C115.1V
637.131A5.962A5.947A1.980A509.5090.12%214052.142.95 °C0.988
12.112V5.031V3.328V5.042V565.3848.50 °C115.1V
743.402A6.959A6.948A2.184A594.4589.35%220552.844.28 °C0.990
12.105V5.029V3.323V5.029V665.3450.77 °C115.1V
849.694A7.953A7.952A2.390A679.4288.63%220552.845.34 °C0.991
12.095V5.028V3.319V5.018V766.5552.38 °C115.1V
956.411A8.460A8.471A2.393A764.3887.94%220552.846.33 °C0.991
12.086V5.026V3.316V5.010V869.1954.83 °C115.1V
1062.875A8.958A8.960A3.005A849.1787.15%220552.847.18 °C0.992
12.079V5.025V3.314V4.990V974.4256.36 °C115.1V
1169.963A8.958A8.962A3.006A934.1486.22%220552.848.93 °C0.992
12.070V5.024V3.314V4.984V1083.5060.38 °C115.1V
CL10.100A15.016A15.005A0.004A126.4081.58%220552.846.36 °C0.987
12.170V5.033V3.305V5.100V154.9552.80 °C115.1V
CL270.807A1.002A1.003A1.002A867.5287.57%220552.848.03 °C0.992
12.062V5.028V3.343V5.046V990.7057.99 °C115.1V

Load regulation is pretty tight on all rails (the 5V rail registers the smallest deviation). This Seasonic platform delivers good voltage stability, among others.

The XTR 850W achieves 90% efficiency with 20% load, while the 80 PLUS Gold certification asks for 87%. The 50% load test is a clear pass also, and under full load the PSU achieves 0.15% more efficiency than required. This unit's KM3S platform easily meets the Gold standard's requirements, even under stressful conditions. Moreover, the PSU can deliver its full load (and even more) at high ambient temperatures.

Of course, the cooling fan spins fast once the thermal load increases significantly, making a ton of noise. The fan profile gets aggressive once the ambient exceeds 40 °C, even under typical loads. If you need a silent PSU and you plan to push it hard, then you should look elsewhere.

Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.