Comparisons and Test System Setup
Both the ASUS GeForce GTS 250 Dark Knight edition and the Sapphire Radeon HD 4850 Vapor cards are really more about better-than-standard cooling offerings that out-of-the-box overclocking, leaving the customer to pursue the avenue of clock speed increases on their own. 
Mid-range matchup: ASUS GTS 250 Dark Knight and Sapphire HD 4850 Vapor - Graphics Cards 58
ASUS GeForce GTS 250 DK 512MB

Mid-range matchup: ASUS GTS 250 Dark Knight and Sapphire HD 4850 Vapor - Graphics Cards 59
Sapphire Radeon HD 4850 Vapor 512MB

For our benchmarks today we are going to be comparing both the ASUS and Sapphire cards to the recently released Radeon HD 4770 card and the 1GB version of the GeForce GTS 250.  The ASUS GTS 250 DK 512MB card will sell for about $130 while the Sapphire HD 4850 Vapor 512MB card goes for about $135

Test System Setup

CPU

Intel Core i7-920 @ 2.67 GHz

Motherboards

ASUS P6T6 WS Revolution X58 + nForce 200

Memory 

Corsair 3 x 2GB DDR3-1600

Hard Drive

Western Digital VelociRaptor 300GB

Sound Card

Sound Blaster Audigy 2 Value

Video Card

ASUS GeForce GTS 250 DK 512MB
Sapphire Radeon HD 4850 Vapor 512MB
AMD Radeon HD 4770 512MB
NVIDIA GeForce GTS 250 1GB

Video Drivers

NVIDIA: 182.08
AMD: Catalyst 9.4
Power Supply PC Power and Cooling Turbo-Cool 1200w

DirectX Version

DX10 / DX9c

Operating System

Windows Vista Ultimate 64-bit


Our thanks go out to Corsair for the memory for our test bed, to PC Power and Cooling for the 1200w beast of a PSU for the system and to ASUS for the P6T6 WS Revolution motherboard.
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  • 3DMark Vantage

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