Phenom II X4 955 O/C Performance And Efficiency
|AMD Phenom II X4 Test Settings|
|Default Settings||Overclock Settings|
|CPU||AMD Phenom II X4 955 3.2 GHz 2MB L2+6MB L3 Cache, 1.328V||3.86 GHz, (19x 203 MHz), 1.45V|
|RAM||DDR3-1333 CAS 9-9-9-24, 1.50V||DDR3-1624 CAS 6-6-5-18, 1.65V|
|Motherboard||MSI 790FX-GD70 Socket AM3, 790FX/SB750, BIOS 1.3 (04/27/2009)|
|Graphics||Zotac GeForce GTX260² 576MHz GPU, 999 MHz Shader, 896MB GDDR3-2484|
|Hard Drive||Western Digital VelociRaptor WD30000HLFS 300 MB, 10,000 RPM, 16 MB Cache|
|Sound||Integrated HD Audio|
|Networking||Integrated Gigabit LAN|
|Operating System||Microsoft Windows Vista Ultimate x64 SP1|
|Graphics||GeForce 182.08 Desktop|
The X4 955’s 21% overclock probably isn't going to bowl anyone over, but its 3.86 GHz final speed is still well above average for an air-cooled Phenom II system, thanks to the good performance of Rosewill’s Fort 120 cooler.
Sandra shows a 19% improvement in Arithmetic and 20% improvement in Multimedia extensions performance.
Though memory data rate and timings were altered significantly, its performance improved by only 1%. The X4 955 has better base bandwidth than the X2, but apparently less room for improvement.
Power consumption increased by 31%, mostly because of the higher voltage required to reach this high clock speed.
An average CPU performance increase of 20% and an average power increase of 31% caused the overclocked Phenom II X4 to lose around 8% of its original efficiency. Once again, it would likely have been possible to actually increase efficiency by overclocking at or near stock voltage, but the maximum speed increase would have been much smaller. For more on increasing the efficiency of your Phenom II overclock, check out this piece.