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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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Much higher effective memory clock speed 4,500 MHz vs 1,386 MHz Around 3.2x higher effective memory clock speed
Higher clock speed 1,000 MHz vs 796 MHz More than 25% higher clock speed
Higher memory bandwidth 72 GB/s vs 22.18 GB/s Around 3.2x higher memory bandwidth
Better floating-point performance 1,280 GFLOPS vs 191.04 GFLOPS Around 6.8x better floating-point performance
Higher texture rate 40 GTexel/s vs 6.37 GTexel/s More than 6.2x higher texture rate
Higher pixel rate 16 GPixel/s vs 3.18 GPixel/s More than 5x higher pixel rate
Significantly higher memory clock speed 1,125 MHz vs 693 MHz More than 60% higher memory clock speed
More shading units 640 vs 120 520 more shading units
More texture mapping units 40 vs 8 32 more texture mapping units
More render output processors 16 vs 4 12 more render output processors
More compute units 10 vs 3 7 more compute units
Front view of Radeon HD 4580

Reasons to consider the
ATi Radeon HD 4580

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Slightly lower TDP 65W vs 80W Around 20% lower TDP

Features Key features of the Radeon HD 7770  vs 4580 

memory bandwidth Rate at which data can be read from or stored in onboard memory

Radeon HD 7770
72 GB/s
Radeon HD 4580
22.18 GB/s

pixel rate Number of pixels a graphics card can render to the screen every second

Radeon HD 7770
16 GPixel/s
Radeon HD 4580
3.18 GPixel/s

texture rate Speed at which a graphics card can perform texture mapping

Radeon HD 7770
40 GTexel/s
Radeon HD 4580
6.37 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 7770
1,280 GFLOPS
Radeon HD 4580
191.04 GFLOPS

shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading

texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes

Specifications Full list of technical specs

gpu

Radeon HD 7770  vs
4580 
GPU brand AMD ATI
GPU name Cape Verde XT RV635
Market Desktop Desktop
Clock speed 1,000 MHz 796 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 640 120
Texture mapping units 40 8
Render output processors 16 4
Compute units 10 3
Pixel rate 16 GPixel/s 3.18 GPixel/s
Texture rate 40 GTexel/s 6.37 GTexel/s
Floating-point performance 1,280 GFLOPS 191.04 GFLOPS

memory

Radeon HD 7770  vs
4580 
Memory clock speed 1,125 MHz 693 MHz
Effective memory clock speed 4,500 MHz 1,386 MHz
Memory bus 128 bit 128 bit
Memory 1,024 MB 512 MB
Memory type GDDR5 GDDR3
Memory bandwidth 72 GB/s 22.18 GB/s

noise and power

TDP 80W 65W

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