Mistel Vision MX650 Fanless 650W Power Supply

REVIEW INFORMATION
SUPPLIED BY: Mistel
PRODUCT: Mistel Vision MX650 Fanless 650W
PROD LINK: MX650 Fanless Product Page
PRICE: $159.99 MSRP
Price is at time of testing!

Mistel Vision MX650 Fanless 650W

Well, that’s a… hmm… what is that? It resembles the Seasonic Focus Plus, but it is not a Seasonic. How can I tell? A few ways. Transformers are from Lianduan, lacking the traditional markings Seasonic units have. Line input board is reminiscent of Seasonic, but not quite right. The wires are Enhance colored. Several semiconductors are from Excelliance, which I can’t recall Seasonic using. The QC pass sticker on the main filter cap is wrong. PCB colors are like a Sirfa. The minor rail VRM looks wrong.

No, it’s not a Seasonic. Would you like to know who the OEM is? Well, I couldn’t figure it out so I sent a few emails. Turns out the OEM is…… Mistel. They’ve gone and done an Inwin, and chosen to make their own. Half of this unit is built in China, then it’s sent over to Taiwan for finishing up. The fact that they would be willing to go to this length alone is impressive enough, but we’ll need to take a close look and see if they’ve done things well enough to last for a five year warranty and beyond.

Mistel Vision MX650 Fanless 650W

We’ll stop by the line input board first, and find one X cap and two Y caps. So far, so good.

Mistel Vision MX650 Fanless 650W

Next, we’ll find the rest of the line filter here, consisting of another X cap, two Y caps, two coils, and a TVS diode. I am somewhat concerned about the zip tie helping to hold the “M” shaped heatsink to the big transformer as well, but not enough to score against, I think. I have a big box full of video cards in the other room with massive 120x38mm screamer fans held on using just one big zip tie. They didn’t fail unless I cut them. Good zip ties do hold up, and it won’t be the only thing holding that heatsink on, either. It’s just there for extra peace of mind.

Mistel Vision MX650 Fanless 650W

On the solder side of the board, we find very nice soldering with four EMP16N04S parts from Excelliance for the 12V output. A CM6500 handles PFC control, a CM6901 handles PWM control, and a WT7527V handles protection right next to… oops.

I have to take it back about the soldering. Let me show you.

Mistel Vision MX650 Fanless 650W

That… is not acceptable, and I reckon my Mistel contact will be cracking the whip at the factory over this. PCB damage, flux all over… that’s going to get scored on. This is where the VRM attaches on the topside.

It’s a shame, too… the rest of the unit is soldered just like we want from a high end unit. Not quite as good as the best factories are capable of, mind you, but at least as good as the best Channel Well based units I’ve seen.

Mistel Vision MX650 Fanless 650W

Here, we discover the unit relies on two 25A bridge rectifiers with enormous heatsinks. Two 6R099P6s and a diode manage the PFC part of town. With equally huge heatsinks.

Mistel Vision MX650 Fanless 650W

Over in capacitor land, we discover the box was dead serious about Japanese parts. It’s all the good stuff from Chemi-Con and Nichicon.

Mistel Vision MX650 Fanless 650W

Four NCE65T180F parts handle switching duty.

Mistel Vision MX650 Fanless 650W

The minor rail VRM is back in here.

Mistel Vision MX650 Fanless 650W

Here’s an EM8569C handling the standby PWM control. You can just see one of the two RGB LEDs in the top left corner of this shot on the modular board.

Mistel Vision MX650 Fanless 650W

Soldering on the modular board is a step down from most of the mainboard, but a step up from the issues we did find around the VRM soldering.

Mistel Vision MX650 Fanless 650W

Finally, the other side of the modular board. You may have spotted a fan connector… that’s not for fan power. No, there’s a separate two pin connector provision for that on the mainboard. This connector is for Aura Sync functionality for the non existent fan. It is likely Mistel intends this platform to be used for their fanned designs as well, which makes sense. You don’t want to blow a huge wad of money on different designs for different products when you’re just starting out. That’s a good way to go broke.

Let’s get some scoring done.