Reviews - Rosewill Tachyon 1000W
Sample Provided by: Rosewill (By OklahomaWolf on Mon, Jan-14-2013)

Page 3 - Cold Testing

It's time to get some load testing done. Since this unit is based on the same platform as the Kingwin Lazer Platinum, I'll try for pretty much the same loading scheme. Loading itself will be done using both of my SM-268 load testers, just to make sure I can go as high as the 83A rating on this beast.

As always, the Rek RF9901, Tektronix TDS-2012B, dual probe thermometer, and Extech DMM will be in use as well.

Results from Rosewill Tachyon
1000W STANDBY load tests
Test # +5VSB DC Watts/
AC Watts
P.F. Eff.
1 0.5A 2.57W/
0.335 75.8%
2 1.25A 6.38W/
0.460 77.1%
3 2.5A 12.7W/
0.528 75.6%

First, the standby load tests. Everything looks good here... the unit isn't quite the most efficient in this area as some I've tested, but better than average pretty much across the board.

Voltage regulation is excellent at about 1.4%.

Results from Rosewill Tachyon 1000W low load test
+3.3V +5V +12V -12V 5VSB DC Watts/
AC Watts
P.F. Eff.
10.3% 1.5A 1.5A 7A 0.2A 0.5A 206.8W/
0.983 85.2%
3.36V 5.14V 12.21V -12.16V 5.12V

I'm not surprised to see the efficiency number here, or the voltage readings, but I am pleased. All of this data tracks very well with the old Kingwin, so we know that this platform continues to remain consistent.

Efficiency is over 85% already, which is a good sign for the unit's chances of hitting Platinum in the progressive tests. Speaking of which, let's get those started.

Results from Rosewill Tachyon 1000W COLD load tests
Test #
+3.3V +5V +12V DC Watts/
AC Watts
Eff. P.F. Intake/
Progressive load tests
1 1.5A 1.5A 15.5A 206.8W/
119.3V 89.7% 0.975 25°C/
3.36V 5.14V 12.20V
2 3A 3A 31A 410.5W/
117.6V 91.3% 0.987 26°C/
3.35V 5.12V 12.18V
3 3.5A 3.5A 39A 513.0W/
118.8V 91.4% 0.990 25°C/
3.34V 5.11V 12.17V
4 5.5A 5.5A 62A 810.2W/
117.4V 90.3% 0.992 25°C/
3.32V 5.08V 12.12V
5 7A 7A 78A 1016W/
117.2V 89.2% 0.993 27°C/
3.30V 5.05V 12.09V
CL1 12A 12A 0A 105.8W/
118.2V 82.7% 0.983 35°C/
3.34V 5.06V 12.22V
CL2 0A 0A 83A 1008W/
116.0V 89.3% 0.994 27°C/
3.32V 5.11V 12.09V

*Fanless operation
**Intermittent fan operation

Before we talk about numbers, note the asterisks next to the temperatures. This unit was only truly fanless in test one. In tests two and three, it began to cycle on and off. Often, I had to get my temperature readings while the fan was in the midst of powering up, so some of these temperatures might be a little wonky. That said, by the time I got into test four, the fan came on for good and I was able to take more stable temperature readings.

How goes the efficiency? Well, the unit did hit Platinum... barely. It only gave me a clean pass on test five - the other two levels require assistance from my 1% error allowance to get the pass. I remember this being a little bit of a struggle the last time I saw this platform, too.

In terms of voltage stability, the calculator tells me we're seeing 1.8% regulation on the 3.3V rail, 1.8% on the 5V rail, and an outstanding 0.9% on the 12V rail. That averages to 1.5%, and is just below the line it has to cross in order for me to score the regulation as being excellent. One hopes that it can move up just a bit in the hot testing to really wow me there, but as is the voltage stability is still very good.

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