Intel i7 4770K Haswell
Thermaltake Frio Advanced
2 x 8GB Kingston HyperX Predator DDR3-2133
Asus EAH5870 V2 Stalker Ed
240GB Kingston HyperX 3K SSD
LG Hitachi 8X Blu-Ray Burner
SilverStone Temjin TJ04-E Evolution
SilverStone Strider Gold 650W
Windows 8 Professional
Using a Kill-a-Watt meter, I measured the power usage of the system at the outlet, during both idle and load. All clock frequencies, voltages and other BIOS settings were at factory defaults, other than the memory which was configured for the XMP profile. To generate the load I used OCCT's power supply test utility, which stresses both the CPU and GPU up to 100%. This first test was performed without a discrete video card installed, using only the on-die HD4600 graphics of the i7 4770K. Thus a very low 28W is consumed during idle state, and only around 150W even at full load. Keep in mind these levels are measured at the outlet, and compared to the max continuous output that SilverStone rates the Strider Gold 650 for, less than 25% of its capacity is being utilized. Let's see if we can stress the power supply a little more than that.
The only discrete video card I have on hand to test with is an ATI HD5870, however this added slightly more than 200W usage at the outlet. Idle consumption doubles from 28W to 59W by adding the card, and peak load tops out at 356W. This is still less than 50% of the rated output capacity that SilverStone claims for the Strider Gold 650, so it's easy to understand how this little power supply can handle a Crossfire HD7970 or SLI GTX 770 setup.
With a Fluke digital multimeter, I also took voltage readings at the back of the connector under idle and load conditions, with the HD5870 in place. The +5V and +12V rails were the most stable, in fact the +5V didn't move at all, and the +12V differed by only 0.01V between idle and load, with a variance of only .01V under load. The +3.3V rail dropped 0.02V going from idle to load, however still varied only .01V under load.
As this is the first power supply used in our i7 4770K build, unfortunately I have no other results to compare to yet. Judging by the 80Plus report on this unit and the low amount of wattage usage measured, it certainly seems to be quite an efficient power supply. However much of the perceived power savings could very well come from the improvements in the Haswell and series-8 Intel chipset architectures. As we get more review units to compare we'll be better able to judge how the Strider Gold 650 stacks up.
Unfortunately these are the only tests we are capable of conducting at this time. We do not have access to expensive power supply testing equipment nor would we expect most of our readers to understand the detailed findings that such equipment outputs. If you are an electrical engineer or a hardcore PSU enthusiast, I would suggest you check out some other more detailed reviews on this unit or any other before making a purchasing decision.
Let's wrap up with some final thoughts and conclusion.