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Differences What are the advantages of each

Front view of Radeon HD 6390

Reasons to consider the
AMD Radeon HD 6390

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Slightly more shading units 320 vs 128 192 more shading units
Significantly lower TDP 39W vs 150W 3.8x lower TDP
Front view of GeForce GTS 250

Reasons to consider the
ZOTAC GeForce GTS 250

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Higher clock speed 750 MHz vs 550 MHz More than 35% higher clock speed
Higher memory bandwidth 73.6 GB/s vs 16 GB/s More than 4.5x higher memory bandwidth
Higher effective memory clock speed 2,300 MHz vs 1,000 MHz More than 2.2x higher effective memory clock speed
Higher texture rate 48 GTexel/s vs 8.8 GTexel/s Around 5.5x higher texture rate
Much higher memory clock speed 1,150 MHz vs 500 MHz More than 2.2x higher memory clock speed
More texture mapping units 64 vs 16 48 more texture mapping units
Slightly higher pixel rate 12 GPixel/s vs 4.4 GPixel/s Around 2.8x higher pixel rate
Wider memory bus 256 bit vs 128 bit 2x wider memory bus
More render output processors 16 vs 8 Twice as many render output processors

Features Key features of the Radeon HD 6390  vs GeForce GTS 250 

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

Radeon HD 6390
16 GB/s
GeForce GTS 250
73.6 GB/s

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

Radeon HD 6390
4.4 GPixel/s
GeForce GTS 250
12 GPixel/s

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

Radeon HD 6390
8.8 GTexel/s
GeForce GTS 250
48 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6390
352 GFLOPS
GeForce GTS 250
483.8 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 6390  vs
GeForce GTS 250 
GPU brand AMD Nvidia
GPU name Redwood LE G92 B1
Market Desktop Desktop
Clock speed 550 MHz 750 MHz
Is dual GPU No No
Reference card None Nvidia GeForce GTS 250 702 MHz 1 GB

raw performance

Shading units 320 128
Texture mapping units 16 64
Render output processors 8 16
Pixel rate 4.4 GPixel/s 12 GPixel/s
Texture rate 8.8 GTexel/s 48 GTexel/s
Floating-point performance 352 GFLOPS 483.8 GFLOPS

memory

Radeon HD 6390  vs
GeForce GTS 250 
Memory clock speed 500 MHz 1,150 MHz
Effective memory clock speed 1,000 MHz 2,300 MHz
Memory bus 128 bit 256 bit
Memory 1,024 MB 1,024 MB
Memory type DDR2 GDDR3
Memory bandwidth 16 GB/s 73.6 GB/s

noise and power

TDP 39W 150W

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