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Differences What are the advantages of each

Front view of Radeon HD 6490

Reasons to consider the
AMD Radeon HD 6490

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Slightly more memory 1,024 MB vs 256 MB 4x more memory
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 1,000 MHz 40% higher effective memory clock speed
Higher memory clock speed 700 MHz vs 500 MHz 40% higher memory clock speed
More texture mapping units 32 vs 16 Twice as many texture mapping units

Features Key features of the Radeon HD 6490  vs 4650 

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

Radeon HD 6490
16 GB/s
Radeon HD 4650
22.4 GB/s

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

Radeon HD 6490
4.4 GPixel/s
Radeon HD 4650
4.8 GPixel/s

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

Radeon HD 6490
8.8 GTexel/s
Radeon HD 4650
19.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6490
352 GFLOPS
Radeon HD 4650
384 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 6490  vs
4650 
GPU brand AMD ATI
GPU name Redwood RV730
Market Desktop Desktop
Clock speed 550 MHz 600 MHz
Is dual GPU No No
Reference card None ATi Radeon HD 4650 600 MHz 256 MB

raw performance

Shading units 320 320
Texture mapping units 16 32
Render output processors 8 8
Compute units 4 4
Pixel rate 4.4 GPixel/s 4.8 GPixel/s
Texture rate 8.8 GTexel/s 19.2 GTexel/s
Floating-point performance 352 GFLOPS 384 GFLOPS

memory

Radeon HD 6490  vs
4650 
Memory clock speed 500 MHz 700 MHz
Effective memory clock speed 1,000 MHz 1,400 MHz
Memory bus 128 bit 128 bit
Memory 1,024 MB 256 MB
Memory type DDR2 GDDR3
Memory bandwidth 16 GB/s 22.4 GB/s

noise and power

TDP 39W 48W

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