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AMD's Radeon HD 5000-Series: Measuring Power Efficiency

Test System

Test System Configuration
CPUAMD Athlon II X2 250 (3 GHz, 2 MB cache)AMD Phenom II X4 955 Black Edition (3.2 GHz, 8 MB Total Cache)
MotherboardAMD 790GX: Biostar TA790GX A3+
RAMTeam Elite TED32048333HC9D  (8 GB) at DDR3-1066 CAS 9-9-9-24
Graphics CardATI Radeon HD 3300 (AMD 790GX), 500 MHz GPUATI Radeon 2900 XT (AMD R600), 742 MHz GPU, 825 MHz MemoryGigabyte Radeon HD 5670 1 GB – GV-R567OC-1G (Redwood), 785 MHz GPU, 1000 MHz MemoryGigabyte Radeon HD 5770 1 GB – GV-R577UD-1GD (Juniper), 850 MHz GPU, 1200 MHz MemorySapphire Radeon HD 5870 1 GB – Vapor-X HD5870 1G OC Version (Cypress), 875 MHz GPU, 1250 MHz MemorySapphire Radeon HD 5870 2 GB – Toxic-HD5870 2G (Cypress), 925 MHz GPU, 1225 MHz Memory
Hard DriveWestern Digital Green Power 1 TB WD10EACS, 16 MB cache, SATA 3.0Gb/s
SoundOnboard Sound, Realtek ALC880
NetworkingOnboard Gigabit Ethernet, Realtek RTC8111C, 1 Gb/s
Power SupplyPC Power & Cooling Silencer 750 watt ATX12v v.2.2, EPS 12V CrossFire Edition
CPU CoolerThermalright Ultra Extreme 120, Noctua NF-P12 120 mm fan
Fans2 x Noctua NF-P12 120 mm fan (not including CPU fan)
Operating SystemWindows Vista Home Edition 32 bit SP1
GraphicsAMD Catalyst 10.6
Benchmark Configuration
GamingCrysis: Version 1.2.1, Demo: CPU Benchmark – Island, DirectX9, Quality Preset: High
Video EncodingCyberlink PowerDirector 8: Version 8.00.3022, Video Trailer “Nine Inch Nails: Beside You In Time” 2:20, 1080p. Profile: AVCHD 1920x1080. Video Bitrate: 15.5 Mbps.
Video PlaybackCyberlink PowerDVD 9: Version 9.0.1530.0, Video Trailer “Nine Inch Nails: Beside You In Time” 2:20, 1080p. Hardware Acceleration: Enabled.
ProductivityAdobe Photoshop CS4: Version 11.0, GPU Acceleration: Enabled
Synthetic Benchmarks and Settings
Cinebench R11Version 11, OpenGL Test.