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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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Significantly higher clock speed 1,000 MHz vs 550 MHz More than 80% higher clock speed
Much higher effective memory clock speed 4,500 MHz vs 1,000 MHz 4.5x higher effective memory clock speed
Higher memory bandwidth 72 GB/s vs 16 GB/s 4.5x higher memory bandwidth
Better floating-point performance 1,280 GFLOPS vs 352 GFLOPS Around 3.8x better floating-point performance
Much higher memory clock speed 1,125 MHz vs 500 MHz 2.2x higher memory clock speed
Higher texture rate 40 GTexel/s vs 8.8 GTexel/s More than 4.5x higher texture rate
Higher pixel rate 16 GPixel/s vs 4.4 GPixel/s Around 3.8x higher pixel rate
More texture mapping units 40 vs 16 24 more texture mapping units
More render output processors 16 vs 8 Twice as many render output processors
More shading units 640 vs 320 Twice as many shading units
More compute units 10 vs 4 6 more compute units
Front view of Radeon HD 6390

Reasons to consider the
AMD Radeon HD 6390

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Lower TDP 39W vs 80W 2.1x lower TDP

Features Key features of the Radeon HD 7770  vs 6390 

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

Radeon HD 7770
72 GB/s
Radeon HD 6390
16 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 6390
4.4 GPixel/s

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

Radeon HD 7770
40 GTexel/s
Radeon HD 6390
8.8 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 7770
1,280 GFLOPS
Radeon HD 6390
352 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
6390 
GPU brand AMD AMD
GPU name Cape Verde XT Redwood LE
Market Desktop Desktop
Clock speed 1,000 MHz 550 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 640 320
Texture mapping units 40 16
Render output processors 16 8
Compute units 10 4
Pixel rate 16 GPixel/s 4.4 GPixel/s
Texture rate 40 GTexel/s 8.8 GTexel/s
Floating-point performance 1,280 GFLOPS 352 GFLOPS

memory

Radeon HD 7770  vs
6390 
Memory clock speed 1,125 MHz 500 MHz
Effective memory clock speed 4,500 MHz 1,000 MHz
Memory bus 128 bit 128 bit
Memory 1,024 MB 1,024 MB
Memory type GDDR5 DDR2
Memory bandwidth 72 GB/s 16 GB/s

noise and power

TDP 80W 39W

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