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Differences What are the advantages of each

Front view of Radeon HD 4650

Reasons to consider the
BIOSTAR Radeon HD 4650

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Higher effective memory clock speed 1,400 MHz vs 792 MHz More than 75% higher effective memory clock speed
Slightly higher memory bandwidth 22.4 GB/s vs 6.34 GB/s More than 3.5x higher memory bandwidth
More texture mapping units 32 vs 4 28 more texture mapping units
Slightly higher texture rate 19.2 GTexel/s vs 2.38 GTexel/s More than 8x higher texture rate
Higher memory clock speed 700 MHz vs 396 MHz More than 75% higher memory clock speed
More shading units 320 vs 40 280 more shading units
Wider memory bus 128 bit vs 64 bit 2x wider memory bus
Front view of Radeon HD 3550

Reasons to consider the
ATi Radeon HD 3550

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Slightly lower TDP 30W vs 48W Around 40% lower TDP

Features Key features of the Radeon HD 4650  vs 3550 

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

Radeon HD 4650
22.4 GB/s
Radeon HD 3550
6.34 GB/s

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

Radeon HD 4650
4.8 GPixel/s
Radeon HD 3550
2.38 GPixel/s

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

Radeon HD 4650
19.2 GTexel/s
Radeon HD 3550
2.38 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 4650
384 GFLOPS
Radeon HD 3550
47.52 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 4650  vs
3550 
GPU brand ATI ATI
GPU name RV730 RV620
Market Desktop Desktop
Clock speed 600 MHz 594 MHz
Is dual GPU No No
Reference card ATi Radeon HD 4650 600 MHz 256 MB None

raw performance

Shading units 320 40
Texture mapping units 32 4
Render output processors 8 4
Compute units 4 2
Pixel rate 4.8 GPixel/s 2.38 GPixel/s
Texture rate 19.2 GTexel/s 2.38 GTexel/s
Floating-point performance 384 GFLOPS 47.52 GFLOPS

memory

Radeon HD 4650  vs
3550 
Memory clock speed 700 MHz 396 MHz
Effective memory clock speed 1,400 MHz 792 MHz
Memory bus 128 bit 64 bit
Memory 256 MB 512 MB
Memory type GDDR3 DDR2
Memory bandwidth 22.4 GB/s 6.34 GB/s

noise and power

TDP 48W 30W

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