The ports are split across the bottom right-hand side of the board with four of the ports banked together with right-angled connectors, whereas the other two ports are on the bottom of the boards PCB with cheaper straight connectors. Four of the ports are from the B450 chipset, and two are driven directly from the CPU internal IO. The B450 Tomahawk has better than average SATA support for a B450 board, with a total of six SATA ports. The B450 Tomahawk supports DDR4-3466 straight out of the box, and with the four available RAM slots it allows for a maximum capacity of up to 64 GB. The improved firmware over the first iteration of AM4 motherboards allows for faster memory. The rest of the available PCIe slots all conform to the PCIe 2.0 interface, with a second full-length PCIe 2.0 x4 slot for add-in cards. This is designed to minimize the risk of slot damage from heavy graphics cards when in transit. MSI’s implementation of the PCIe layout focuses around the center of the board with the solitary and full-length PCIe 3.0 x16 slot getting a garnishing of Steel Slot armor protection. Comparing the B350 Tomahawk to the B450 Tomahawk, the heatsink follows a much sleeker design with MSI focusing a lot of its attention on improving the power delivery cooling capabilities, as well as the cleaner and more neutral looking aesthetics. Users wishing to expand upon have access to two 5050 RGB headers which are both capable of supporting strips with a maximum of 12 V. The B450 Tomahawk includes a single section of eight RGB LEDs in a vertical alignment on the underside of top right-hand side of the board. The patterning across the board resembles a circuit board (of sorts) and the light gunmetal grey MOSFET/chipset heatsinks offer a sense of uniformity to the design. The board does not have an overburdened PCB, which gives the black and grey color more pop. You can also visit my Guide: How to set up a fan curve in the BIOS Maybe you find something useful.The B450 Tomahawk is an ATX sized motherboard which comes from MSI’s Arsenal Gaming range with a heavy focus on value. So MSI doesn't have some sort of "protection", at least i can easily go below 600 rpm. Here are the PWM values for two of my Noctua fans, you can see the resulting RPM. So maybe this is a common thing for your fan somehow? Since you speak French (judging by the link), this is it: What's odd is that Noctua themselves offer a single-channel PWM controller with a peculiarity: It has a "no stop" button, for the fan to stay at 300 rpm instead of it turning off.
If the PWM signal is not correct, obviously it's the board. The board can't "dictate" how the fan interprets the signal, so if the PWM signal coming from the board is correct, the fan is causing this. Either the BIOS has a bug where it doesn't send out the correct PWM signal below 40% (or none at all), or the fan works differently than you expect.
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