| Cooler Master Real Power Pro 1250W Power Supply
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Testing:
The testing of this power supply was broken into several phases in order to try to generate as much information about its performance as possible. The initial test of the Cooler Master Real Power Pro 1250W Power Supply's performance had it installed into a system with the following equipment:
» 1x ASUS K8N-DL nVidia nForce4 Professional motherboard
» 2x AMD Opteron 270 processors (4x 2.0GHz cores)
» 2x Thermalright Ultra-90 coolers with 92mm Panaflo fans
» 4x 512MB HP Branded Micron PC3200 DDR REG memory
» 2x 1024MB Corsair Branded Micron PC3200 DDR REG memory
» 1x 750GB Western Digital SATA 3.0 Gbps drive
» 1x 750GB Seagate SATA 3.0 Gbps drives
» 1x 200GB Seagate SATA 1.5 Gbps drive
» 1x 300GB Maxtor eSATA 1.5 Gbps drive
» 1x 256 MB HIS IceQ X1300XT Turbo PCIe graphics
» 1x PATA DVDRW
» 1x PATA CD-ROM
» 1x Firewire DVDRW
» Thermaltake Armor full tower case with 2x 120mm and 1x 92mm fans
» USB bus powered devices:
» 1x Gravis Gamepad
» 1x Mitsumi floppy drive
» 1x VoIP phone handset
» 1x Logitech Easy Call desktop
» 1x 8GB Corsair Flash Survivor
» Windows XP Professional (current)
This setup was used in order to duplicate the configuration of a recently completed review. The 1250W unit from Cooler Master would now be put head-to-head with two units that would actually combine for the same total power; a 750W PC Power and Cooling Silencer and a 500W Enermax Liberty.
The first phase of testing involved monitoring the three main voltage rails (3.3V, 5V, and 12V) during idle and load conditions using a Radio Shack digital multimeter (Cat. No. 22-810). The idle condition was established by allowing the system described above to sit at the Windows desktop with no applications running for a period of at least 30 minutes. The load condition was established by overclocking slightly (5%), running the SMP version of Folding@Home so all four cores were active, using SyncBack to transfer data from one drive to two others, and running OCCT to stress the CPU and system memory. What I will refer to as the "load+" condition takes the initial load condition and connects a Seasonic brand "Loader", which can generate up to 148W on the 5V and 12V rails.
The chart below details the findings, and although multimeter data provides just a split second of information, there was more to it than that. The multimeter was used to monitor each line a few different times during testing, and for several minutes each time. All rails on the Cooler Master unit remained static from test to test, with no fluctuations while in use. The only value that changed at all was the 5V rail which dropped from 5.05V to 5.04V when the Seasonic Loader was added.
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