X-bit labs

Started by: Ocean | Date 04/25/05

Comments: 16 | Last Comment:  02/06/07

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1. Are you running the input voltage in 240V instead of 120V? As I recalled, only the Seasonic SS-400HT has ever met the 80 Plus requirement[1], and the program ran 120V as input. It wouldn't be a fair to list a '80 plus' PS here when it only Europeans can benefit from such efficiency.

[1] http://www.80plus.org/

We are running 220V AC only.

2. i would really like to know what you think about the ElanVital Greenerger SSM psu

3. You list the continuity power of the Coolermaster 450w power supply. Do you do the same for the rest? Most power supplies only list the peak power. The peak of the Coolermaster on 12v is 18a+16a. Coolermaster is at least honest to also list the continuity power while other list only the peak power. Because no power supply can work longer than one minute on peak.

No, the peak power of the RS450-ACLY on 12v is 22A, not 34A (18A+16A), because total power on +12V rails should not exceed 264W. All other PSUs also list continuos power beacuse of requirements of the "ATX/ATX12V Power Supply Design Guide" (MTBF must be greater than 30 000 hours under full load and 50°C ambient temperature).

We test all PSUs at their full load (as specified on label or in the user manual) for at least 30-40 minutes.

4. Check
http://www6.tomshardware.com/howto/20050228/power_supply-01.html#cooler_master_real_power_450w
they found out a totally different efficiency!!!

why/how?

I don't know about precision of their measurements. Our system is calibrated and proved with Uni-T UT70D digital multimeter (TrueRMS, ±0.05%±1 digit base accuracy on DC voltage, ±0.8%±2 digits on AC voltage and ±0.5%±4 digits on AC current) and we believe that errors of our measurements are less than 3% (less than 2% in 100...300W range).

5. test

test

6. Test

7. No efficiency or PF graph for the HEC unit?

It was not correctly measured due to temporary problems with our test system. I apologize.

In my computer I have this installed: http://www.hecgroupusa.com/FLEX1.php?id=54
They are very cheap in OEM form, mine was $27 including shipping. I was just curious to see how efficient HECs are.

8. Nice review!
Silentpcreview also found out a totally different efficiency,
but for OCZ Modstream 520 tested at 120VAC. Why is that?
http://www.silentpcreview.com/article208-page1.html
Youre 220VAC efficiency should be higher, but this high?
You´re efficiency seems to increase while their decrease when nearing the maxpower. Their data appear more natural to me.

I don't know anything about precision of their measurements so I couldn't discuss their results. Our system was calibrated and proved with Uni-T UT70D digital multimeter and we believe that errors of our mesurements are less than 3% in all suitable conditions.

Efficiency difference between 220VAC and 110VAC is about 3...5% for PSUs without PFC. With active PFC difference can be bigger due to additional losses in PFC ciruit.

Usually efficiency of switching mode power supply (any SMPS, not only computer ones) rises while loading increases, but near the maximum power there can be fall of efficiency, depending on power supply topology and schematic, input and output voltages and so on. For example you can see here: http://www.st.com/stonline/books/pdf/docs/5546.pdf -- page 5, figure 5 "Efficiency vs. Load Current", there are three different supply voltages and three corresponding curves. Also there is a little fall of efficiency near the maximum power for MGE Vortec PSVO-600 and A.C.Ryan Ryapower2 PSUs in my article.

9. wow!
it is so beautiful...

i wonder whats the prize of it...

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