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Test Settings

Triple-GPU Scaling: AMD CrossFire Vs. Nvidia SLI
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Test System Configuration
CPUIntel Core i7-2600K (Sandy Bridge) LGA 1155: 3.40-3.80 GHz, 8 MB L3 Cache
Overclocked to 4.00 GHz at 1.25 V
MotherboardAsus P8P67 WS Revolution: LGA 1155, BIOS 1007 (01/24/2011)
Intel P67 Express, Nvidia NF200 PCIe Bridge (2 x PCIe 2.0 x16)
RAMKingston KHX2133C9D3T1K2/4GX: 2 x 2 GB, DDR3-2133 at DDR3-1600 CAS 7-7-7-21, 1.60 V
Hard DriveWestern Digital WD1002FBYS: 1 TB, 7200 RPM, SATA 3Gb/s, 32 MB cache
GeForce GraphicsAsus ENGTX570/2DI/1280MD5: 742 MHz GF110 GPU, 1280 MB GDDR5-3800
Radeon GraphicsXFX HD-695A-CNFC: 800 MHz Cayman GPU, 2 GB GDDR5-5000
SoundIntegrated HD Audio
NetworkIntegrated Gigabit Networking
PowerOCZ-Z1000M: 1000 W Modular, ATX12V v2.2, EPS12V, 80 PLUS Gold
Software
OSMicrosoft Windows 7 Ultimate 64-bit
GeForce GraphicsGeForce/Ion 266.58
Radeon GraphicsAMD Catalyst 11.1
ChipsetIntel INF 9.2.0.1019


CPU “bottlenecks” are always a problem at medium (and lower) resolutions. Today’s tests start at medium resolutions, so we clocked Intel’s Core i7-2600K to 4.0 GHz in an effort to minimize that issue.

The Achilles-heel of Intel’s fastest processor is a platform that supports only sixteen PCIe 2.0 lanes directly from the processor to the graphics card. Asus solves that solution by incorporating Nvidia’s 32-lane NF200 bridge, thereby repeating the same information at full bandwidth to two cards simultaneously. Triple-GPU mode operates in an x8/x8/x16 configuration, as it would with most X58 motherboards.

Power might be the price for performance, but we wanted to see if it also scaled with performance as GPU numbers increased. OCZ’s 80 PLUS Gold-rated Z1000M provides that clean power while adding only around 11% overhead at our watt meter.

Benchmark Configuration
3D Games
Aliens Vs. Predator BenchmarkAlien vs Predator Benchmark Tool
Test Set 1: Highest Settings, No AA
Test Set 2: Highest Settings, 4x AA
CrysisPatch 1.2.1, DirectX 10, 64-bit executable, benchmark tool
Test Set 1: Highest Quality, No AA
Test Set 2: Highest Quality, 4x AA
F1 2010v1.01, Run with -benchmark example_benchmark.xml
Test Set 1: Highest Settings, No AA
Test Set 2: Highest Settings, 4x AA
Just Cause 2Version 1.0.0.2, Built-In Benchmark "Concrete Jungle"
Test Set 1: Highest Details, No AA, 16x AF
Test Set 2: Highest Details, 4x AA, 16x AF
S.T.A.L.K.E.R.: Call Of PripyatCall Of Pripyat Benchmark version, all options, HDAO
Test Set 1: Ultra Preset, DX11 EFDL, Ultra SSAO, No AA
Test Set 2: Ultra Preset, DX11 EFDL, Ultra SSAO, 4x MSAA
Synthetic Benchmarks and Settings
3DMark 11Version: 1.0.1.0, Benchmark Only
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