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Differences What are the advantages of each

Front view of Radeon R5 340

Reasons to consider the
AMD Radeon R5 340

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Much higher effective memory clock speed 4,500 MHz vs 1,400 MHz Around 3.2x higher effective memory clock speed
Higher clock speed 800 MHz vs 600 MHz Around 35% higher clock speed
Higher memory bandwidth 72 GB/s vs 22.4 GB/s Around 3.2x higher memory bandwidth
More memory 2,048 MB vs 256 MB 8x more memory
Significantly higher memory clock speed 1,125 MHz vs 700 MHz More than 60% higher memory clock speed
Better PassMark direct compute score 1,231 vs 607 More than 2x better PassMark direct compute score
Front view of Radeon HD 4650

Reasons to consider the
BIOSTAR Radeon HD 4650

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Slightly lower TDP 48W vs 65W More than 25% lower TDP

Benchmarks Real world tests of Radeon R5 340 vs HD 4650

PassMark Direct Compute Measures performance of general-purpose computing using Microsoft DirectCompute

Features Key features of the Radeon R5 340  vs HD 4650 

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

Radeon R5 340
72 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 R5 340
6.6 GPixel/s
Radeon HD 4650
4.8 GPixel/s

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

Radeon R5 340
19.8 GTexel/s
Radeon HD 4650
19.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon R5 340
633.6 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

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