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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 1,660 MHz Around 2.8x higher effective memory clock speed
Significantly higher clock speed 1,000 MHz vs 670 MHz Around 50% higher clock speed
Higher memory bandwidth 72 GB/s vs 26.56 GB/s Around 2.8x higher memory bandwidth
Better floating-point performance 1,280 GFLOPS vs 428.8 GFLOPS Around 3x better floating-point performance
Slightly more memory 1,024 MB vs 256 MB 4x more memory
Higher texture rate 40 GTexel/s vs 10.72 GTexel/s Around 3.8x higher texture rate
Higher memory clock speed 1,125 MHz vs 830 MHz More than 35% higher memory clock speed
More texture mapping units 40 vs 16 24 more texture mapping units
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 3690

Reasons to consider the
ATi Radeon HD 3690

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GPUBoss is not aware of any important advantages of the ATi Radeon HD 3690 vs the AMD Radeon HD 7770.

Features Key features of the Radeon HD 7770  vs 3690 

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

Radeon HD 7770
72 GB/s
Radeon HD 3690
26.56 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 3690
10.72 GPixel/s

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

Radeon HD 7770
40 GTexel/s
Radeon HD 3690
10.72 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 7770
1,280 GFLOPS
Radeon HD 3690
428.8 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
3690 
GPU brand AMD ATI
GPU name Cape Verde XT RV670
Market Desktop Desktop
Clock speed 1,000 MHz 670 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 16
Compute units 10 4
Pixel rate 16 GPixel/s 10.72 GPixel/s
Texture rate 40 GTexel/s 10.72 GTexel/s
Floating-point performance 1,280 GFLOPS 428.8 GFLOPS

memory

Radeon HD 7770  vs
3690 
Memory clock speed 1,125 MHz 830 MHz
Effective memory clock speed 4,500 MHz 1,660 MHz
Memory bus 128 bit 128 bit
Memory 1,024 MB 256 MB
Memory type GDDR5 GDDR3
Memory bandwidth 72 GB/s 26.56 GB/s

noise and power

TDP 80W 75W

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