For our testing, we used a standard volt meter to read the voltage of the various rails while the power supply was idle and while under load.
- In Win Ironclad Case
- Gigabyte GA-EX58-UD3R Motherboard
- Intel Core i7-920
- 6GB Crucial Ballistx Tracer RAM
- Patriot 256GB Torqx SSD
- Western Digital Caviar Green 2TB Drive
- Palit Radeon 4870 X2
- Sparkle 1250 Watt Power Supply
- Windows 7 x64
The idle reading was taken right after a fresh reboot with no extraneous processes running. The load results were achieved by running multiple instances of the GPU edition of Folding@Home to stress the GPU, and an instance of Prime95 running with 8 threads. I realize that this rig is not enough to fully stress test the PSU, but it should be more representative of most user’s rigs.
There is only a 0.1% discrepancy between the load voltage and idle voltage. This is a very good sign.
I said it in the beginning and I’ll say it again. Unless you’re powering a multi-GPU rig or a serious HPC setup, you don’t need this. If you have several additional internal cards, two or more nVidia or ATI video cards, or several hard drives and don’t think you have a need for 1250 watts of power but are concerned that your 500-600 watt PSU just isn’t cutting it then you might want to check out the 1000 watt version of this power supply here.
If you do in fact have a need for 1250 watts of raw performance, you will not be disappointed by this PSU. The fan still running for a few seconds after the machine is powered down, is a nice idea for helping extend the longevity of the unit. This technique is similar to what projectors do. All the bells and whistles are in place for this PSU, along with the raw performance to make them worth having. If you are in the market for a power supply greater than 1KW (1000 Watts), you really can’t go wrong with the Sparkle 1250 Watt Gold Class power supply (GW‐EPS1250DA).