Montech BETA 2 850W Power Supply, ATX 3.1 & PCIe 5.1 Ready, 80+ Bronze Certified, Next-Gen 12V-2x6 Cable, DC-to-DC Stability, Industrial Japanese Main Capacitor, Full Protection Suite

I am not a professional power supply tester. I don't have a way to measure exact ripple current or power stability. But I have been a PC enthusiast since 650W power supplies would power any high end single GPU system. Now days we have GPUs that can pull that by itself with even the slightest overclock. I have been seeing good things online about Montech PSUs and have been impressed with their K95 Pro case I used for my daughter's build. So I decided to give this a shot. It has been running for 3-4 weeks on a 12700K with a RTX 3080. I purposely wanted to push it to the limit just to see if there were any issues and it has been rock solid. I am constantly seeing total power draw in gaming between 550-625 watts. That is definitely not the sweet spot as you usually want to run at 50-60% rated power for peak efficiency. This was just done as a test to see if it could handle it. I will eventually swap back over to her 850w Corsair PSU and keep this for a backup. Overall I am very impressed. This isn't going to have all of the fancy features. It is not modular. It doesn't have a 12V-2x6 plug. But it does have decent looking all black cables, it is quiet, and provides solid power at it's rated spec which is what you should be shopping for in a PSU of this size. If you are building anything but the lowest spec gaming machine I would personally recommend that you bump up to the 850 watt version for just $10 more. That gives you much more flexibility in the future. It also gives you the native 12V-2x6 cable. With GPUs getting more and more power hungry if you decide to upgrade in to one of the next few generations you may be glad you have the extra headroom. For me power supplies are something I keep very long term. I have been building PCs for over 20 years and am only on my 3rd PSU in my PC. I have had a 1300w Super Flower Leadex running a RTX 5090 and 9950X3D for about a year. Before that I ran an EVGA 850G2 for well over 10 years and only replaced it because it burnt out from a slow drip in my GPU waterblock. I can only hope that this Montech PSU is half that reliable.

Clay Birdyshaw · 2026-04-17 · via amazon

I'm upgrading a machine from a 500W supply to this 650W to give some more headroom for future processor/graphics upgrades. Compared to the old supply, this has less available current on the 5V and 3.3V rails (13A each vs 15A). All the power gain comes from the 12V rail (54.1A vs 41.67A). The first thing I notice is this is a relatively light power supply. Not a lot of heatsink mass, and the case metal while not too thin, isn't as heavy duty as some supplies. The textured wire insulation looks cool, but I don't like that it is unlabeled (no wire gauge info). I like that the wires are loose rather than connected like flat ribbons, a bit easier to route. The cable setup was almost identical to my old corsair 500W so I just rerouted it the same way. The 650W has 5 cable bundles: - 2 8-pin CPU (27" to 1st, 32" to 2nd) - 2 6+2-pin PCI-E (21" to 1st, 26" to 2nd) - 4 Molex (21" to 1st, 40" to the last) - 4 SATA (21" to 1st, 40" to the last) - 1 20+4 ATX (25 in) 5 year warranty seems in line with similar class power supplies. Other accessories in the box: 5ft (1.5M) power cord, four ~6" (15cm) zip ties, and 4 mounting screws. My load is probably only about 200W with the current setup. Under load I saw the 5V rail drop from 5.18V to 5.16V, and the 12V rail from 12.04V to 11.93V. Hook up went fine, and it's been running smooth for a week with no stability issues. == Internals == Fan is a BOK BDH12025S DC12V 0.30A. It has a custom frame with a piece of clear plastic inserted as a baffle to force air over the front area more. I didn't see anything on the fan or supply to indicate speed control. It has a 2-pin connector. Quite happy with the input protection and filtering on this. The plug has X1Y2 capacitors from both line/neutral to ground then they pass through a ferrite. Line is fused (should be 12A, but I couldn't see). There are two Class X2 capacitor, and a pair of common mode chokes before the bridge rectifier. After the rectifier is a relay and NTC thermistor. A massive inductor to limit inrush current to the chunky TK 420V 470μF capacitor (seems to be the only Japanese capacitor). Primary side switching consists of a pair of Perfect Intelligent PTA25N50 500V 25A MOSFETs, a Maple Semi MSD04065G1 650V schottky rectifier. Then a pair of PTA18N50 500V 18A MOSFETs. This supply has power factor correction via Champion CM6800UX controller. Secondary rectification is three Pingwei PS30U60CTR 30A schottky rectifiers. Output capacitors are either JICON electrolytics, or HEC polymer capacitors. Most of the output chips are NDP parts (NDP5202RB, 2x NDP23803QB, NDP2332KC), mostly high efficiency DC-DC converters. There was also one UTC LM358G dual op-amp, and a GR Energy GR8312F (output monitoring, power good, and PSON control). Nothing is missing that I would expect to see, so the only way I can imagine this price point is the component quality suffers. Most of these brands are unfamiliar to me so I can't say for sure. The wiring has color coded heatshrink bundles with crimped on connectors soldered to the PCB. Very clean looking. The wire bundle exits through a bit large hole so that the zip tie strain relief isn't much help.

JHoney · 2026-04-07 · via amazon

I have used Montech PSUs in a 4 builds now and have yet to have any issues crop up. This one is nice a quiet, no coil whine, and looks very nice while doing it! I have this one running a system with a 9600x and a Nvidia 5060, and when checking with a Killawatt meter there seems to be plenty of power to spare! There is a PSU tier list out there (search for it) and just about everything Montech makes is well regarded. For a budget PSU, these are a great value. As I stated before, I have a few different models in machines at my house and all have been reliable. I personally like the simple but clean style of their units as well.

Amazon Customer · 2026-05-15 · via amazon

The Montech BETA 2 650W fits perfectly in most builds, and the cable lengths are well thought out. I opened the unit to inspect the internals, and the layout is clean and well-organized. The main capacitors are high-quality (as advertised), while the smaller caps use standard cut tops—this is common across the industry and doesn’t impact performance. Electrically, this PSU is solid. Voltage on the rails is tight, and under heavy stress, dips are minimal. The DC-to-DC topology delivers clean, independent power, which really shines during dynamic loads. Even with rapid GPU and CPU power swings, I didn’t notice any rail fluctuations. Thermally, it runs quietly and stays cool under normal loads. At around 650W, it does warm up noticeably, but nothing alarming or unsafe. The protection suite also works exactly as advertised: if a short is detected, the unit shuts down almost instantly, giving me full confidence it will protect motherboard sand components. Overall, a well-engineered, reliable 650W PSU that delivers on its advertised specs. Great value for the price, and I’m very happy with it.

Ross · 2026-04-29 · via amazon

Set up this 80PLUS Bronze rated 550W power supply on a test bench with a 13700KF and an Intel B580 graphics card. Normally I would recommend a little bit more power due to the Intel 13th gen CPUs being so power hungry, but this power supply seemed to work well when stress testing the CPU by itself. Obviously, 80PLUS Bronze is not the most efficient rating for a PSU so the fan may audibly ramp up under a sustained load. The lack of modularity is an inconvenience, but at the time of this review the power supply is only about $50, which seems to be in line with other non-modular units on the market.

Aaron C · 2026-05-13 · via amazon

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