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Our testing methods
Testing was conducted in two parts. First, PSUs were run in the system detailed below for a series of power draw, temperature, and noise level tests. They were then hooked up to The Beast to test power delivery and overall efficiency.

All tests were run three times, and their results were averaged.

Processor Athlon 64 X2 5000+ 2.6GHz
System bus HyperTransport 16-bit/1GHz
Motherboard Asus M2N32-SLI Deluxe Wireless Edition
Bios revision 0906
North bridge nForce 590 SLI SPP
South bridge nForce 590 SLI MCP
Chipset drivers ForceWare 9.35
Memory size 1GB (2 DIMMs)
Memory type Corsair CM2X512A-5400UL DDR2 SDRAM at 742MHz
CAS latency (CL) 5
RAS to CAS delay (tRCD) 5
RAS precharge (tRP) 5
Cycle time (tRAS) 12
Audio codec Integrated nForce 590 SLI/AD1988B with 5.10.1.4530 drivers
Graphics 2 x GeForce 8800 GTS 640MB with ForceWare 162.18 drivers
Hard drives 2 x Western Digital Caviar RE2 400GB SATA
OS Windows XP Professional
OS updates Service Pack 2

We used the following versions of our test applications:

The test systems' Windows desktop was set at 1280x1024 in 32-bit color at an 85Hz screen refresh rate. Vertical refresh sync (vsync) was disabled for all tests.

All the tests and methods we employed are publicly available and reproducible. If you have questions about our methods, hit our forums to talk with us about them.