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Test System And Benchmarks

Professional Help: Getting The Best Overclock From AMD's A8-3870K

In an effort to best demonstrate multiple configurations, we first tested our system at stock frequencies using 800 MHz memory at 8-8-8-24-2T timings. Those are the same settings used in February's Llano-based overclocking story. Then, we overclocked Corsair's Vengeance kit to 933 MHz (the architecture's highest official data rate) using 9-9-9-24-29-1T timings, but kept stock CPU and GPU speeds.

We're also including a standard overclock using the same 933 MHz memory setting, changing only the CPU and GPU multipliers, but not the reference clock. This gives us 3.6 GHz processing cores and a 960 MHz GPU.

Finally, we include the highest memory overclock, a 117 MHz reference clock, 3627 MHz CPU cores, a 936 MHz GPU, and 1092 MHz (2184 MT/s DDR3) memory at 10-10-10-27-35-2T.

We're ultimately interested in how our all-out overclock compares to a discrete Radeon HD 6670 DDR3. So, we installed it in the overclocked system and disengaged its on-die GPU.

Socket FM1
AMD A8-3870K (Llano), Stock: 3.0 GHz,
Overclocked To 3.627 GHz @ 1.5 V
Asus F1A75-V Pro, Socket FM1, Chipset: AMD A75
Integrated GraphicsIntegrated Radeon HD 6550D, Stock: 600 MHz,
Overclocked To 960 MHz @ 1.3 V
Discrete GraphicsRadeon HD 6670 DDR3
800 MHz GPU, 900 MHz (1800 MT/s DDR3) memory
On-board Gigabit LAN controller
Corsair Vengeance CMZ4GX3M2A2000C10
2 x 2 GB, Max rating: 2000 MT/s, CL 10-10-10-27-2T,
Max overclock: 2184 MT/s @ CL 10-10-10-27-2T
Hard Drive
Western Digital Caviar Black 750 GB, 7200 RPM, 32 MB Cache, SATA 3Gb/s
ePower EP-1200E10-T2 1200 W, ATX12V, EPS12V
Software and Drivers
Operating System
Microsoft Windows 7 x64
DirectX 11
Graphics Drivers
Catalyst 12.7 Beta
Benchmark Configuration
3D Games
Battlefield 3
Version, Operation Swordbreaker, Fraps Runs
Elder Scrolls V: Skyrim
Version, Fraps Runs
DiRT 3
Version, Built-In Benchmark
StarCraft II
Version:, Tom's Hardware Guide Benchmark
Synthetic Benchmarks
3DMark 11Version:, Benchmark Only
SiSoftware Sandra 2011Version 2011.1.17.15, CPU Test = CPU Arithmetic / MultiMedia, Memory Test = Bandwidth Benchmark
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