The 5-phase vcore sees each phase driven by a pair of ISL99360 60A powerstages into a pair of inductors, so that means there's ten 60A powerstages in total, just two less than that of the X570 Tomahawk. However, if we look at the VRM, this board is in a completely different league, too. Now, the latest B-series Tomahawk board, the B550 commands a $180 price tag and that's obviously a huge step up. We're still looking at a 4-phase vcore but this time upgraded to a pair of On Semi 4C029N FETs on the high side with a pair of On Semi 4C024N Fets on the low-side, though each phase still only feeds into a single inductor. The MSI B450 Tomahawk was slightly higher at $110, but you were getting a much better motherboard in terms of VRM performance. The original B350 Tomahawk started life at $100 and featured a very basic VRM, the 4-phase vcore used Niko PK616BA MOSFETs on the high-side with a pair of Niko PK632BA MOSFETs on the low-side with a single inductor per phase. Something we need to discuss before getting into the test results is pricing, and of course, the VRM configuration for each board. On hand we have the MSI B350 Tomahawk, so we'll be adding that to the mix and it will be an excellent reference point for the B450 and B550 Tomahawk boards. We also realized we've never looked at any B350 boards since our formal VRM thermal testing began after the release of the B450 chipset. We've already looked at how some of the more expensive B550 boards compare to the MSI B450 Tomahawk, so we thought it might be interesting and perhaps more relevant to see how the MSI B550M Pro-VDH Wi-Fi stacks up, as well as the B550-A Pro. While we have yet to completely wrap up that testing, so far we've been able to gather some pretty interesting results. Over the past week we've been testing the VRM on a number of entry-level AMD B550 motherboards such as the Gigabyte B550M DS3H, Asus Prime B550M-A, Asrock B550M Pro4, and the MSI B550M Pro-VDH Wi-Fi.
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