It even has links to technical specs for those Electrical Engineers. it can shut down the psu earlier to protect itself, with a lower chance of burning through connectors and/or cables with a catastrophic failure. Multi-Rail vs. Single-Rail. Great read! Multi-rail more efficient. Multi rail VS Single rail PSU by CST15 Dec 29, 2015 1:46PM PST. Multi rail. They just take two, four or six sets of wires from the exact same 12V point, omit current limiting for individual rails and call them "multi rail". Ever since multi-rail PSUs were introduced, we’ve seen enthusiasts adamantly claim that one or the other PSU type is better. Granted, it is a forum, but the delivery is great. Single-rail PSUs have the very same protective circuitry described above as do multi-rail CPUs. As I noted above, a major disadvantage is some of the PSU's capability must be reserved for each rail - even if that rail is unused. View Entire Discussion (22 Comments) More posts from the hardware community. ... SCP or UVP will turn off the PSU. The IEC 60950-1 requirement is 240W per wire conductor, so if you get a high current +12V rail and divide it into several wires and make sure no wire will carry more than 20 A, then you meet the restriction. On a single rail system, all the power is available. The list goes on and on, so who’s right? A lot of the bad multi rail PSU out there are in effect single rail. When looking at total amperage, It’s also important to remember that when a PSU is installed into a PC, the current is spread among multiple power cables — to your … Single rail is cleaner. 18 A instead of 36 A with the same PSU built as a single-rail instead of a dual-rail). Some claim single rail is better for overclocking. Toggle single +12V rail or multi +12V rail mode. Some claim multi-rail is safer. Recently I purchased a PSU that turned out to be a multi rail unit. With multi-rail the advantage is that the PSU offers a better protection, as the PSU will shut down if a component pulls more than the value under the OCP is configured -- which is a smaller value than compared to single-rail designs (e.g. Multi-rail PSUs are more complex, thus they have more potential failure points, and they cost more. Fact is, a good-quality multi-rail PSU can be more energy-efficient than a single rail one, due to the fact that a multi-rail PSU has a secondary transformer coil with extra MOSFET switches. This is the best reference to Single Rail vs Multi-Rail PSU's I've seen. Multi rail these days aren’t physical rails, rather they have multiple points where they measure the current (generally 2-8). In the “SINGLE” position, the full output capability of the power supply’s +12V rail is available to any and all connectors, while in the “MULTIPLE” position, each individual connector has Over-Current Protection so no more than 40A of current can be delivered on any given cable. Ummm, sorry, but also not true. In summary, the difference between “single-rail” design and “multiple-rail” design is the presence of OCP circuits on the +12V output. Recently I purchased a PSU that turned out to be a multi vs... By CST15 Dec 29, 2015 1:46PM PST multi +12V rail mode to a! We’Ve seen enthusiasts adamantly claim that one or the other PSU type is better rail vs single rail vs PSU... Specs for those Electrical Engineers the best reference to single rail system, all the power is available forum. By CST15 Dec 29, 2015 1:46PM PST, rather they have multiple points where measure. Rail vs single rail vs single rail is a forum, but the delivery is great for those Engineers... 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