MSI · B550 · ATX

MSI MAG B550 Tomahawk

AM4
DDR4-5100
PCIe 4.0
Tier A
No Wi-Fi
2.5 GbE

The MSI MAG B550 Tomahawk holds about 638 W of sustained core power across 10 Vcore stages, which is the figure every processor on this page is measured against.

By Farrukh Sufyan Sarwar · Model v1.0 · Build 2026-09-20

Sustained capacity: 638 W; Derated for design and cooling
Vcore stages: 10 × 60 A
Phase design: Teamed phases
VRM cooling: Heavy heatsink
Memory slots: 4 × DDR4; Up to 128 GB
Validated speed: 5100 MT/s
M.2 slots: 2
Graphics slot: PCIe 4.0 x16
BIOS Flashback: Yes

Power delivery

The MSI MAG B550 Tomahawk carries 10 Vcore power stages rated 60 A each in a teamed arrangement, under heavy heatsinks. Derating for the design and the cooling, our model puts it at roughly 638 W of sustained core power, which is enough for everything up to the AMD Ryzen 9 5900X at 140 W. That figure is published here rather than a marketing total because the phases that feed the SoC and the integrated graphics carry none of the CPU's core load.

What it throttles

Every AM4 processor in this database runs on the MSI MAG B550 Tomahawk without throttling. Its power delivery is not the constraint on this platform, so pick your processor on price and core count and move on.

Lane layout

Every AM4 processor on this board

No throttle28Moderate0Severe0

Every AM4 processor ranked by how well the MSI MAG B550 Tomahawk feeds it
Processor	Verdict	VRM °C	Score
AMD Ryzen 3 41004 cores · 65 W sustained · Zen 2 (Renoir)	No throttle	45	94
AMD Ryzen 5 56006 cores · 85 W sustained · Zen 3	No throttle	46	92
AMD Ryzen 7 5700X8 cores · 88 W sustained · Zen 3	No throttle	47	92
AMD Ryzen 5 36006 cores · 85 W sustained · Zen 2	No throttle	46	92
AMD Ryzen 5 5600X6 cores · 85 W sustained · Zen 3	No throttle	46	92
AMD Ryzen 5 5600G6 cores · 85 W sustained · Zen 3	No throttle	46	92
AMD Ryzen 7 3700X8 cores · 88 W sustained · Zen 2	No throttle	47	92
AMD Ryzen 7 5700G8 cores · 88 W sustained · Zen 3	No throttle	47	92
AMD Ryzen 5 55006 cores · 85 W sustained · Zen 3	No throttle	46	92
AMD Ryzen 5 45006 cores · 85 W sustained · Zen 2 (Renoir)	No throttle	46	92
AMD Ryzen 5 5600GT6 cores · 85 W sustained · Zen 3 Refresh	No throttle	46	92
AMD Ryzen 7 57008 cores · 88 W sustained · Zen 3 Refresh	No throttle	47	92
AMD Ryzen 5 4600G6 cores · 85 W sustained · Zen 2 (Renoir)	No throttle	46	92
AMD Ryzen 5 5500GT6 cores · 85 W sustained · Zen 3 Refresh	No throttle	46	92
AMD Ryzen 5 3600X6 cores · 110 W sustained · Zen 2	No throttle	49	90
AMD Ryzen 5 3600XT6 cores · 110 W sustained · Zen 2	No throttle	49	90
AMD Ryzen 7 5800X3D8 cores · 120 W sustained · Zen 3 V-Cache	No throttle	50	89
AMD Ryzen 7 5700X3D8 cores · 120 W sustained · Zen 3 Refresh	No throttle	50	89
AMD Ryzen 9 5900X12 cores · 140 W sustained · Zen 3	No throttle	52	87
AMD Ryzen 7 5800X8 cores · 135 W sustained · Zen 3	No throttle	52	87
AMD Ryzen 9 5950X16 cores · 140 W sustained · Zen 3	No throttle	52	87
AMD Ryzen 9 3900X12 cores · 140 W sustained · Zen 2	No throttle	52	87
AMD Ryzen 9 3950X16 cores · 140 W sustained · Zen 2	No throttle	52	87
AMD Ryzen 9 5900XT16 cores · 140 W sustained · Zen 3 Refresh	No throttle	52	87
AMD Ryzen 7 5800XT8 cores · 135 W sustained · Zen 3 Refresh	No throttle	52	87
AMD Ryzen 7 3800X8 cores · 135 W sustained · Zen 2	No throttle	52	87
AMD Ryzen 9 3900XT12 cores · 140 W sustained · Zen 2	No throttle	52	87
AMD Ryzen 7 3800XT8 cores · 135 W sustained · Zen 2	No throttle	52	87

Other B550 boards

B550 chipset explained All AM4 hardware Compare with the MSI MAG B550 Tomahawk Max WiFi