Let’s now look at the load of the motherboard slot, which is specified by the PCI SIG as 5.5 amps. This results in a maximum power of 66 watts at 12 volts. You can clearly see that this limit is undercut by 3.6 A under full load, even if you use the maximum power limit. MSI has done a good job here and the slot stays nice and cool.
Transients and power supply recommendation
As I have already demonstrated in detail in my basic article “Graphics Card’s Battle against Power Supply – Power Consumption and Peak Power Demystified ”, higher loads in the millisecond range do exist for short periods of time, which can lead to inexplicable shutdowns if the power supply units are not properly designed or equipped. The TBP (Typical Board Power) measured by the graphics card manufacturer or the reviewers is not really helpful for a stable system design.
Peaks with intervals between 1 and 10 ms can lead to shutdowns in very fast-response protection circuits (OPP, OCP), especially in multi-rail power supplies, although the average power consumption is still within the norm. For this card, I would therefore calculate 550 to 600 watts as the graphics card load proportionate to the system’s total power consumption on the secondary side, in order to have enough reserves for the worst case scenario.
I had already briefly mentioned that the load peaks were surprisingly low in the teardown; I had feared much more. The new circuit design and boost’s interventions help a lot. A short excerpt with higher resolution now shows us the 20-ms measurements (10 μS intervals), as I run them automatically to determine the value: