Corsair RM1000x 1000W Power Supply

PRODUCT: RM1000x 1000W
PROD LINK: RM1000x Product Page
PRICE: $169.99 @ NewEgg
Price is at the time of testing!

RM1000x 1000W – Overshoot Transient Tests
VSB On VSB to 100%, 12V Off to 100%, 12V
O-Scope Shot O-Scope Shot O-Scope Shot

Moving on to the power-up spike tests, we find that the unit isn’t quite as smooth as it could be on any one of these. There is a modest spike on the standby rail, and a tiny one on the 12V rail, but all in all it’s very well controlled. Certainly, we have no violations of the ATX spec going on here, and so we can move on to the real fun stuff… hot testing.

Because I’m using both load testers, I’m not sure how hot the box will get today. I’ll run one of the two extra hot box fans, and unplug it if I need a little more heat.

RM1000x 1000W – Hot Load Tests
Test # +3.3V +5V +12V DC Watts/
AC Watts
Eff. P.F. Intake/
Progressive Load Tests
1 1A 1A 7.2A 99.6W/
118.7V 85.6% 0.976 29°C/
3.30V 5.02V 11.99V
2 2A 2A 15A 203.7W/
118.4V 90.1% 0.993 31°C/
3.30V 5.01V 11.98V
3 5A 5A 37.5A 499.0W/
118.1V 91.1% 0.997 36°C/
3.28V 4.99V 11.94V
4 8A 8A 56A 745.4W/
117.2V 89.8% 0.997 41°C/
3.27V 4.99V 11.91V
5 10A 10A 75A 991W/
115.8V 87.9% 0.998 46°C/
3.26V 4.98V 11.88V
Crossload Tests
CL1 18A 18A 0A 154.2W/
119.7V 82.2% 0.989 34°C/
3.28V 5.01V 11.97V
CL2 0A 0A 83.3A 995W/
116.6V 88.3% 0.998 44°C/
3.27V 4.98V 11.89V

* Fanless operation.

Forty-six degrees, and not a problem to be seen. Excellent.

Sadly, we did not get Platinum efficiency this time out. Test five came in just a hair too low for that. But Gold? No problem whatsoever. It goes without saying that “almost Platinum” turns out to be the same as “way over Gold,” at least in this case. Test five would have to slide by another 1.9% to miss Gold, and that’s not happening here. And with tests two and three still doing Platinum, there’s just nothing to complain about.

Voltage regulation did slide a bit from the cold tests, too. I now see 1.2%, 0.8%, and 0.9% for an average 0.97%. But that’s still excellent, so again there’s nothing to gripe over.

The fan worked about the same duty cycle we saw in the cold tests, so the unit doesn’t seem to mind the heat at all.

There’s nothing to do now but look at the scope shots.

RM1000x 1000W – Oscilloscope Tests
Test # +3.3V +5V +12V
1 O-Scope Shot O-Scope Shot O-Scope Shot
2 O-Scope Shot O-Scope Shot O-Scope Shot
3 O-Scope Shot O-Scope Shot O-Scope Shot
4 O-Scope Shot O-Scope Shot O-Scope Shot
5 O-Scope Shot O-Scope Shot O-Scope Shot
CL1 O-Scope Shot O-Scope Shot O-Scope Shot
CL2 O-Scope Shot O-Scope Shot O-Scope Shot

Now, here’s where we see the benefits of adding those capacitors to the cables. I get 9mV, 9mV, and 10mV for the 3.3V, 5V, and 12V rails respectively.

This is very impressive stuff. And it’s impressive to see results like this in the high-end EVGA units, too, as well as last week’s Andyson. But let me remind you all of something… Delta has been building units for Antec that can do this level of ripple squashing without extra capacitors in the cables. That’s where the industry should be heading, and I kind of worry at times that some of these companies are losing sight of that in the name of being competitive. The capacitors in the cables do tend to ruin the experience of custom modding for some people, and I just don’t want to see the whole industry move to the in cable capacitors en masse. Once in a while, and for most people, it’s ok. On every single unit, it’s not so nice.

So far, Seasonic’s resisting that urge and still shipping units without extra cable capacitors that have a little more ripple but still come in here below 25mV, which is really good enough for me to call excellent. We don’t need ripple below 10mV to have excellent performance, and we should all remember that.

Mini rant over. Let’s take this thing apart.