EVGA SuperNOVA 850 T2 850W Power Supply

PROD LINK: 850 T2 Product Page
PRICE: $239.99 @ NewEgg & EVGA
Price is at the time of testing!

A ball bearing fan starts us off here.

The inside looks exactly like its big brother to me. All parts are in the same locations.

Once again, no line filtering is done on the housing side… it’s all on the mainboard.

Soldering isn’t perfect in that we’re looking at Delta, Etasis, and Zippy quality here, but certainly good enough to get by without me pulling points. Super Flower’s on their A-game again today.

Lots of line filtering going on again here. Looks just as robust as the bigger unit.

Once again, the interleaved PFC section is just about impossible to dig into without destroying something, so this is the best I can do today.

A look at the PFC coils shows us two more Y capacitors sandwiched between them. That’s the standby controller just to the left of the leftmost coil.

Moving over, we find the fan controller on its daughterboard, as well as the 5VSB output pi filter just to the left of it.

One of the two VRMs with the AA9013 PWM controller hiding on the daughterboard behind it. Again, those heatsinks over the output parts are impossible to de-solder without doing damage, so I’ll leave the VRMs alone. I can tell you, however, that they use Infineon output parts.

Hiding in a mix of polymer and electrolytic Chemi-Con capacitors, scattered across four daughterboards, we find a total of eight 027N04L parts used to supply the 12V rail. These are the same parts the 1kW unit uses, only there are fewer of them today.

Four 5R140Ps make up the main switchers, same as its big brother. Only the main filter capacitors seem different without opening up (destroying) the PFC sections of each. The 1kW model used two 390uF and one 330uF caps for line filtering while this one uses two 330s and one 390. No big deal, either way.

I’m adding this shot of the unit’s white NTC shorting relay as an excuse to point something out because a lot of people still seem to freak out about this: that clicking noise you hear in high-end units? It’s supposed to be there. It’s normal. Your power supply is not going to explode in your face. That relay is there to boost efficiency by removing the NTC thermistor (that big heatshrinked green disk at the top center) from the circuit. Without that relay, this thing doesn’t clear Titanium.

You will find these relays in just about all Gold or higher units. Unless, of course, the OEM decides to just install a cheaper jumper wire over a perfectly good NTC thermistor, as Enhance did with this Rosewill.

What does the NTC thermistor do? Well, it helps mitigate the inrush current power supplies draw when starting up. But once they do that millisecond’s long job, they’re no longer needed. Thus, the relay is used to short them out so they don’t constantly suck just a little bit of power at all times.

“OMG, OMG, OMG!!! My power supply made a strange clicky noise, is it going to die?”

No, it’s only strange because you’re used to low-efficiency units. Me, I find it strange if a Gold or better unit doesn’t click. It makes me wonder how many corners the OEM’s cutting.

Our last shot before the scoring will be of the modular connector board. Lots of Chemi-Con filtering going on here.