If you don't plug the CPU fan in there, leave that fan port unused.Ī 3-pin fan plugs into EITHER a 3-pin or a 4-pin fan port on the mobo. But because of that checking feature, if you opt to run your CPU fan straight from a Molex PSU connector at full speed, you must tell your mobo's BIOS NOT to watch that fan, or it will get very upset that there is no fan speed signal to watch.ĭo NOT plug into the mobo CPU_FAN connector ANY other fan. It also allows the mobo to check that the fan is working - it will shut the system down fast if that fan suddenly stops. This ensures that the CPU cooling fan (assuming it's working properly) will run fast enough to keep the CPU at the right temperature, but not too fast so it makes more noise than necessary. One IMPORTANT note: it is advisable to plug your CPU cooler fan into the CPU_FAN port of your mobo, and let the mobo's automatic systems control the CPU fan speed. Such a system has no way for the fan's speed to be sent to the mobo. Details below.Ī 4-pin Molex connector from the PSU will supply 12 VDC to the fan at all times over 2 wires, so it always runs at full speed. Igor's Lab looks at the capabilities of each 12VHPWR pin closely, with a discussion about the pin-out diagram of the H+ connector.Start with: all case fans are designed to run at 12 VDC for full speed, but will run slower under the right conditions. Cable quality is probably going to be mentioned prominently in PC PSU and accessory maker publicity materials, but I hope they don't make the headlines for the wrong reason. On the cabling side of things, the spec requires higher quality cables to be used (as they will be carrying more power in less area) to prevent issues at this point of the design. These four contacts are to carry sideband signals, but we don't know exactly what purposes they will be used for. Looking more closely at Igor's diagram, you can see a series of four contacts below the 12 pins of the main plug. This new socket can deliver 55A of continuous current at 12V, for a theoretical max power delivery of 660W (600W plus 10 per cent redundancy). In summary, the 12VHPWR has 12 pins, each fitting into a 3mm square spacing (8-pin Molex spacing is 4.2mm) in two rows, for a 18.85mm wide connector, which is just a tad wider than the old Molex 8-pin one. Some PC component suppliers have already started listing 12VHPWR / H+ plugs and cables and from these sources Igor's Lab has put together a diagram, explaining various features of the connector. The new 12VHPWR can deliver much greater power, is more future-proof, and is likely to be widely adopted as backed by the PCI-SIG, which also refers to it as the 'High Power Connector (H+)'. In August last year we first saw Nvidia's own design solution to this problem, a compact new 12-pin power connector (19mm), to replace the typical two 8-pin connectors on high-end boards, and which became standard fare on Founders Edition GPUs, if not many PSUs. Called 12VHPWR, the new connector can deliver up to 600W via 12 pins, a power draw which would normally require a graphics card to be fitted with four 8-pin Molex power connectors. A new high density power connector designed as part of the PCIe 5.0 standard, and rumoured to be present on the Nvidia GeForce RTX 3090 Ti, has come to light.
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