Megjelent talán az egyik legrészletesebb teszt a Corsair VX450Wröl ajánlom mindenki figyelmébe.
a Lényeg:
"[I]The results for this power supply were simply unbelievable, especially when we think that this is supposedly an entry-level power supply. After reviewing a lot of lousy low-end power supplies it is a real joy to see an entry-level model that can not only deliver its rated power at 48º C, but also achieve an outstanding efficiency and a very low ripple and noise levels.
Efficiency is definitely one of the highlights of this product. Corsair says this power supply achieves a maximum 85% efficiency, but they are wrong – in a good way. The only time this power supply achieved efficiency BELOW 85% was when we pulled 450 W from it (84.3%). On all other tests efficiency varied between 86% and 88%. Amazing. Just to put things into perspective other entry-level power supplies can’t even reach 80% efficiency, and the ones that can they don’t reach 85%.
Voltage regulation during all our tests (including the overload tests we will present on next page) was outstanding, with all outputs within 3% of their nominal voltages – ATX specification defines that all outputs must be within 5% of their nominal voltages – except on -12 V, which was between -11.14 V and -11.42 V, depending on the load pattern. These numbers, however, are still inside the 10% margin that is set by the ATX spec for this output. Of course we always want to see values closer to the nominal voltage.
Noise and ripple was another highlight of this product. Corsair VX450W produces very little noise level, far below the maximum admissible. When we were pulling 450 W from it noise level at +12 V was 29.8 mV, at +5 V was 19.2 mV and at +3.3 V was 13.2 mV, as you can see on the screenshots below (just to remember, the maximum allowed values are 120 mV for +12 V and 50 mV for +5 V and +3.3 V; all these values are peak-to-peak values). We were really impressed by these results.[/I]"
aztán jól tulterhelték:
"[I]We tried to see not only the maximum power we could extract from this power supply with it still working inside its specs, but also if all its protections are working correctly. As you know by now, power supplies usually burn when we try pulling more than it is capable of handling if it doesn’t feature overload protection (OLP or OPP; these two acronyms mean the same thing).
Since we were already pulling from the +12 V output almost the maximum our load tester can deliver to this output – 33 amps – we removed the power supply EPS12V connector from +12V1 input and installed it on the +12V2 input from our load tester. Then starting from pattern number five described on previous page we started increasing current until the power supply turned off. We figured out that if we pulled more than 44 A (528 W) from +12 V (22 A from the motherboard, video card and peripheral cables and 22 A from EPS12V) the power supply wouldn’t turn on. Phew, we were really cold sweating expecting the worst – that this power supply would explode. But since it shut down, we could testify that overload protection was in action, which is terrific.
Then we increased current on +5 V and +3.3 V to see if we could pull even more. Under the current configuration if we pulled more than 7 A from these rails the power supply would shut automatically down.
With this maximum configuration (44 A from +12 V, 7 A from +5 V and 7 A from +3.3 V – i.e. a total of 596 W!) the power supply would turn on and work for around 30 seconds, after that the power supply would shut down due to overload. Isn’t that great to have a power supply with overload protection in action? You can do whatever you want and it doesn’t explode!
We decreased two amps from the +12 V output and we could make our 450 W power supply to work stable at 570 W at 48º C and with 81% efficiency! Holy cow! You can see the summary for this test on the table below.
Short circuit protection (SCP) worked fine for both +5 V and +12 V lines. It seems that over current protection (OCP) is configured with a value far above what is written on the label, as we could pull up to 44 A from the +12 V rail, while the label says the limit is 33 A.
Over load protection (OLP a.k.a. OPP) was in action, shutting down the unit if we pulled more than it could handle, preventing it from burning.[/I]"
don't look up, don't look up, don't look up, don't look up, don't look up, don't look up, don't look up...
