Rosewill VSB 650W 80+ Bronze, ATX 3.0 & 3.1 Compatible, Semi-Modular Power Supply, PCIe 5.1 12V-2×6 Connector, 105°C/221°F Japanese Capacitor, 120mm ICB Silent Fan – 5 Year Warranty

Works fine with an ASRock B450m Pro4 motherboard
At $50, the 650W version is is a 5* supply for my low-midrange system, replacing a blown Corsair supply. Necessary cables were included, and the semi-modular design eliminated some unneeded ones. They’re all 18 AWG, 90C — a bit of overkill in some cases, and stiffer than the 20 and 22 AWG, 80C SATA and Molex cables from my old supply. The connectors were fine.In Fig. 1, Rosewill is presumably scaling the load across all outputs. Under that assumption, the 115V efficiency Eff(percent) in terms of output power (P, watts) is roughly Eff = 95.4 – 700W/P – 0.0157xP. The Loss in watts would then be 7W + 0.0465xP + 0.000157xP^2.Fig. 2 displays the cable connectors and capacities. ATX 3.x power supplies have shuffled current capacities: +3.3V and +5V are down to 18A — but motherboards now power the CPU from +12V, instead of the +3.3V line. The -12V line is down from 0.8A to 0.3A. My ASRock B450m Pro4 motherboard is said to require -12V for the audio, though the ATX 3.x standard now has -12V as optional; 0.3A seems to suffice. And, of course, +12V current capacity is way up.Note that both 6+2 pin PCIe connectors are on a single 2-ft. cable, plugging into a single power supply socket. At the 375W limit, that’s 31.3A over 3 lines, effectively 10.4A through each pair of 4-ft, 18 AWG wires. The ampacity for an 18 AWG copper wire is nominally 18A at 90C, so that part is OK. At 65C, resistance is 7.51 ohm/1000 ft, giving a voltage drop of 0.31V and power loss of 9.7W for the 3 pairs… probably OK, but most modular ATX 3.1 supplies use multiple PCIe connectors and cables. The voltage drop is going to be a bit less for the PCIe 12+4 cable — less than 600W through 6 pairs of 18 AWG wires.Again, I don’t expect any problems on a low-midrange system, but it’s become hard to find detailed specs on motherboards, etc., so one doesn’t know exact power supply requirements.

A solid budget offering from Rosewill.
At the ~50$ price point, this is a very solid PSU option. Cable length is adequate, and the black color is pretty nice looking too, with a foe braiding texture imbued onto the covering which I liked quite a lot. The fan is relatively quiet, and I couldn’t really notice it when using the system.As a solid C rated unit, this is the lowest end PSU that I’d consider for a gaming rig. It’s not winning any awards, but has all of the necessary safety features.However, if you’re buying this PSU to use in a very tight case, or a case with poor cable management space, please keep in mind that the 12V HPWR cable is one of the fixed cables. You cannot remove it even if you’re using a card that makes use of the 6+2 PCIe power cable. I found this a little bit confusing as other semi-modular units generally only kept the 20+4 pin and 4+4 pin power cables as the fixed ones. Additionally, I spent a solid minute or two bumbling over myself trying to figure out which cable was the 4+4 EPS CPU power cable due to the lack of any clear and obvious labeling. I eventually figured it out. haha.Overall, this is an easy to install unit thanks to a smaller footprint, acceptable cable lengths, and reasonable build quality. If you’re looking for a good budget power supply, I can’t recommend this one enough.

Great value for the price!!!
Purchased this out of all the choices in its price range. Only sub 50 dollar power supply with the newest 16pin cable, making perfect for builds with lower end Nvidia 5000 series cards. Powering a RTX 5070/12700K system without any issues and PSU is quiet which is a bonus in this price range.

Missing CPU cable??
Can’t find the CPU cable, am I going crazy? Please help!