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Differences What are the advantages of each

Front view of Radeon HD 7770

Reasons to consider the
AMD Radeon HD 7770

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Higher clock speed 1,000 MHz vs 750 MHz Around 35% higher clock speed
Much better sky diver factor score 221.64 vs 2.24 More than 98.8x better sky diver factor score
Better PassMark score 2,194 vs 1,379 Around 60% better PassMark score
Higher effective memory clock speed 4,500 MHz vs 3,600 MHz 25% higher effective memory clock speed
Higher memory clock speed 1,125 MHz vs 900 MHz 25% higher memory clock speed
Lower TDP 80W vs 150W More than 45% lower TDP
Front view of Radeon HD 4870

Reasons to consider the
ATi Radeon HD 4870

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Higher memory bandwidth 115.2 GB/s vs 72 GB/s More than 60% higher memory bandwidth
Wider memory bus 256 bit vs 128 bit 2x wider memory bus

Benchmarks Real world tests of Radeon HD 7770 vs 4870

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

3DMark Vantage (Texture Fill) Industry standard benchmark that tests DirectX performance

T-Rex (GFXBench 3.0) Data courtesy CompuBench

Radeon HD 7770
3,355.14
Radeon HD 4870
3,353.62

Sky Diver Factor Data courtesy FutureMark

Cloud Gate Factor Data courtesy FutureMark

Crysis: Warhead (2012) 1920x1200 - Frost Bench - Enthusiast Quality + 4xAA

Radeon HD 7770
20.7 fps
Radeon HD 4870
18.6 fps

SmallLux GPU 2.0d4 Measures compute performance using OpenCL to do 3D rendering

Reviews Word on the street

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