The power supply tester is very easy to use. Simply make the necessary connections to the testing unit (4-pin Molex, ATX power connector, 4-pin Floppy style connector, 6-pin PCI-E connector and a 4-pin or 8-pin connector), then plug the power supply into an electrical outlet, flip the power switch (if applicable) and the tester will come to life (granted, the power supply isn't dead). As we can see here, everything looks to be within spec, so let's move ahead with testing.
I installed the OP1000 in my dedicated test system. The unusually long power supply fit inside my system without issue; but again, be sure it will fit in your case before ordering. The test system consists of the hardware listed below:
Intel Core 2 Duo E6600 @ 3.5 GHz
CoolIT Freezone CPU Cooler
EVGA 680i SLI Motherboard
Two 8800 GTX cards in SLI configuration
2 Gb Corsair XMS PC2-6400 Memory
74 Gb Western Digital Raptor 10k RPM HDD
Lite-On Optical Drive
120mm Intake Fan
I used a digital multimeter to obtain voltage readings. Since most power supplies correct any fluctuation in the current to the rails before our multimeters would even notice, we're unable to monitor every output in real-time simultaneously. To record idle voltages, I simply let the system sit idle in Windows for 20 minutes. For load voltages, I ran Prime 95 (one instance per core), Winamp, AIM, multiple FireFox windows and defragmented the hard drive, all while playing Need for Speed: Carbon on max graphics settings. This combination of programs put a nice load on the system. For the 12v 6-pin PCI-E rails, I tested at each connector separately under idle and load and got the average (very little variation, but just to be sure). For the "main" 12v rail, I tested a few different connectors within the computer but there was no variation since they are all on a single rail.
Voltage testing proves this to be a very stable unit with plenty of power to go around. Results across the board were all slightly higher than what I found in the OCZ ProXStream review. The 5v and 3.3v rails were rock stable; I was not able to get them to budge from idle to load. The results clearly speak for themselves.
At the end of the day, the SilverStone OP1000 proved itself without a shadow of doubt in our testing. The unit has more than enough power to handle any current system configuration, including quad-core and / or quad SLI. The single 12v rail is a great idea, eliminating the need to "load-balance" your components across multiple, smaller 12v rails. SilverStone has included two 8-pin PCI-E 2.0 cables which certainly help to "future-proof" this PSU. The 80mm thermal-controlled fan in the OP1000 is a little quieter than the one in the OCZ ProXStream; I certainly don't think it ever spooled up to full speed. I also liked the on / off switch on the back of the power supply, something that was lacking on the OCZ ProXStream.
As of writing, the SilverStone OP1000 power supply is not NVIDIA SLI-certified, but there is a reason for that. The OP1000 has only been on the market for a short time and it takes a good bit of time for NVIDIA to complete their rigorous testing on power supplies, so it's more of a timing issue than anything else. Check the NVIDIA SLI-certification page and you will see that many of the power supplies listed there have been out for some time now.
*** UPDATE *** I was informed by SilverStone that the OP1000 will not be NVIDIA SLI certified because they had submitted it to ATI for CrossFire certification first. They are not allowed to have a single power supply model with both company's certification.
And finally, for the "negatives". First, do note that this power supply is longer than most: we measured ours to be 9" in length. This could cause clearance problems with top-mounted case fans and / or optical drives so be sure to check and see if this unit will physically fit in your case before ordering. As for cables, the majority of them were sleeved but SilverStone "forgot" to sleeve the additional cables after the first connector on each line. A fully sleeved unit would only add to the overall appeal of this PSU.
Much like OCZ's offering, the majority of users who read this will not have any use for such a powerful PSU. Unless you are running a quad-core CPU, quad-SLI or any mixture of extreme cooling (high end watercooling, thermal electric cooler (TEC)), a power supply of this capacity will be overkill. But, for those of you who like to push your system to the absolute limits, do know that there are options out there for you, and the SilverStone OP1000 is certainly one to consider. As of writing, the OP1000 retails for $345.99 at a popular online reseller.
OCIA.net has awarded the SilverStone OP1000 1,000w Power Supply our seal of approval.