XFX XTR 850W Power Supply Review

XFX is targeting serious gamers and hardware enthusiasts with its new XTR Series of PSU. XFX suggest other power supplies do not always deliver, "The Wattage you see isn’t always the wattage you get." We will certainly find out if that is true with the XTR 850W PSU delivers the power and efficiency it promises in its marketing.

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Build Quality

As we already know the XFX XTR 850W features a single 135mm fan design that is used in the same vein as 120mm fans in that these can provide for quiet cooling environments due to the ability to move a larger volume of air at slower speeds than a smaller diameter fan. The 135mm fan is just short of the largest diameter fan we are likely to see in ATX power supplies given the physical constraints of the form factor. While great for quiet computing environments the key criteria in our evaluation is whether or not the cooling solution is sufficient, not necessarily it’s sound output level or form factor, although we certainly listen for offending units.

External Build Quality

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The exterior of the XFX XTR 850W looks exactly like the XTR 550W and the XTR 750W save for changing out the power information. As such, we see the same textured black finish that we see on most power supplies these days and the side of the unit is dominated by the huge printed "XTR." The front of the unit is fully modular with a switch for activating the semi-fanless mode. The rear of the unit is well perforated but about 1/4 of the exhaust is covered by the AC input receptacle and XFX label. Finally, the top of the unit is dominated by the large 135mm fan and uniquely shaped fan grill that XFX uses.

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The XFX XTR 850W itself is ~6 5/8 inches long while the cables provide a serviceable length of ~16 to 26 inches to the first or only connector. The sleeving is a mix of standard wire loom and the flat FlexForce style cabling.

Internal Build Quality

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Once we open the XFX XTR 850W, we see a different Seasonic design than was used in the previous XTR series units we have reviewed. Indeed, this particular unit appears to be a KM3 model that, given the power output level, would make it just like the Cooler Master V850 and Seasonic X-850 we reviewed a bit ago (among other instances). As such, there is not a whole lot new to see here today as this unit is once more a full bridge LLC primary with synchronous rectification and DC-DC VRMs on the secondary side. However, one small variation that we immediately spot is the heatsinks used today are slightly different than the ones used when this platform was used by Cooler Master. The second variation we see is that the fan in this unit is different. Today, the XTR 850W sports a FDB Hong Hua fan rated at 0.5A at 12v. Lastly, before moving on, we see very neat soldering and integration on the main PCB of this unit today.

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The input filtering on the XTR 850W starts on the housing with a shielded (but not self contained) section as before. On the main PCB, we see the remainder of the input filtering leading over to the heatsink that houses a pair of bridge rectifiers. Moving past the bridge rectifiers that are sandwiching the heatsink, we get to the PFC section next. The PFC coil is followed by a large heatsink near the edge of the PCB that houses the power components for the PFC section. Behind the PFC coil, we find the PFC controller housed on the add-in PCB. We then find the main input filtering capacitors which are provided by Hitachi and are rated at 420v 330uF 105c. Finally, moving past these capacitors towards the center of the unit, we find the main switching transistors another ridged heatsink.

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On the "secondary" side, we see the same layout that we saw on the V850 and X-850. As such, the 12v MOSFETs are on an add-in PCB with a heatsink attached. However, the heatsink profile is different than what we saw with the V850. Moving past this and the fan header, we find the transformers and then, on the very edge of the main PCB, an add-in PCB housing the protection circuitry. Moving up to the back of the PCB that houses modular connector panel and DC-DC VRM, we see the minor rail power components. When we move around to the front of this PCB, we once more see the coils and the solid capacitors used in the DC-DC VRMs as well as the modular connectors. The soldering here is all well done and all of the capacitors on the secondary are Nippon Chemi-con (solid and standard).

Build Quality Summary

The XFX XTR 850W’s build quality is excellent just like all of the other units that share this platform that we have seen over the years. There are, of course, differences in the exterior of the unit as various brands have put their stamp on the KM3 based units found inside and the XFX branding is one of the more unique. While unique from other companies though, it is not unique compared to other XTR units as they all share the same stylistic queues. As such, everything we said about XTR 750W and XTR 550W still holds true today in this regard. When we move to the interior, we see a continuation of quality from Seasonic and XFX as it is excellent once more. This means that not only do we get excellent integration but we also get top shelf components. These high quality parts include a Hong Hua fan and capacitors by Hitachi (standard) and Nippon Chemi-con (standard and solid). All in all, this unit is starting off in excellent shape. However, given its lineage that is probably not a surprise. Let's move on to the load testing and see how things go there for the XTR 850W.