This PSU is obviously not just sufficient, but even excessive for such powerful configurations, even though its wattage is considered rather ordinary today now that some manufacturers have offered 600W and higher products. Even if you add a second graphics card into the system it will only increase the power consumption on the +12V rail by 75 watts at most, and the output voltages will still be within acceptable ranges.

By the way, the diagram suggests that the problem with powering modern top-end computers is not about consumed currents, but rather about low quality of many power supplies. Even if we took an old ATX12V 1.2 unit with a maximum allowable current of 15 amperes, the Athlon 64 system would be satisfied (the Pentium 4 is more voracious). Thus, the problem is not about the formal wattage of the unit but about its ability to meet its own specification and to distribute those watts along the output power rails. For example, if we take a 300W unit of the ATX12V 2.0 standard with an allowable load on the +12V rail of 22 amperes or 264 watts, it will be enough even for the Pentium 4, on the condition that the power supply can really yield those 264 watts.

Talking about the BlueStorm AX500-A again, this PSU maintains stability of the output voltages well enough for a PSU of its class. It does deliver the specified power and can be used in advanced configurations that include two graphics cards and a top-end processor. Its output power is even excessive for a system with a single graphics card and one CPU.

The output voltage ripple at the frequency of the PWM regulator is very low when the PSU is under full load: about 15 millivolts on the +5V rail and about 40 millivolts on the +12V rail. This is three times below the maximum allowable value. Alas, the high-frequency ripple was accompanied with low-frequency one (at the double frequency of the power grid or 100Hz in our case) at loads above 300 watts.

If we add this ripple, the pulsation amplitude becomes almost 45 millivolts on the +5V rail and 60 millivolts on the +12V rail. These values are still within the acceptable range, but close to the limit on the +5V rail.