junkeymonkey :
bottom line is if you aint got the amps to cover full load use or spikes its not going to matter is its a crap unit or the best in the world its going to crash
if your system decides to pull 45 amps and you got 38 your done I cant help on what he feel is a solid or crap unit he still could get the best in the world and it fails
A PSU doesn't just "run out" of amps. The majority will burn before that ever happens. The
only time an actual power peak will be reached is if the MOSFETs are functioning in their linear region and the main transformers are over-saturated (thanks to @Jonnyguru.com for this information). This can only be reached if protections are overridden. Protections would kick in long before, either OPP, OCP, or UVP, and you'd have to take the PSU way beyond its ratings,
way beyond, for amperage/power to hit an actual
peak.
Most will burn up anyway. If I'm correct, the only way for peak power to be reached while the PSU remains intact, without blowing up, is if the MOSFETs are overrated. The only companies using overrated components are ones that also employ good protections, meaning peak power is
never reached with power supplies.
In conclusion, a computer power supply won't just stop increasing the rate of energy flow (power). Power doesn't run out! That is why we have overpower
protection and part of why we have overcurrent
protection. The power supplies know no limits. The actual power limit is theoretical and can only be reached by overriding protections and on a unit with a particular type of design, a near-impossible scenario.
Junkeymonkey, on a good unit the computer would not crash by taking the PSU past its rated amperage. On good units, everything will be perfectly fine. If you take it too far, it will gracefully shut down from a protection anyway.
@Ahmed: Check out the unit I recommend above. Did you see my post?