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Differences What are the advantages of each

Front view of GeForce GTS 250

Reasons to consider the
ZOTAC GeForce GTS 250

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Higher clock speed 750 MHz vs 520 MHz Around 45% higher clock speed
Significantly higher memory bandwidth 73.6 GB/s vs 8 GB/s Around 9.2x 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 4.16 GTexel/s More than 11.5x higher texture rate
Significantly more texture mapping units 64 vs 8 56 more texture mapping units
Much higher memory clock speed 1,150 MHz vs 500 MHz More than 2.2x higher memory clock speed
Significantly wider memory bus 256 bit vs 64 bit 4x wider memory bus
Higher pixel rate 12 GPixel/s vs 2.08 GPixel/s More than 5.8x higher pixel rate
More render output processors 16 vs 4 12 more render output processors
Front view of GeForce 8400 GS PCI

Reasons to consider the
SPARKLE GeForce 8400 GS PCI

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Significantly lower TDP 40W vs 150W 3.7x lower TDP

Features Key features of the GeForce GTS 250  vs 8400 GS PCI 

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

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

GeForce GTS 250
12 GPixel/s
GeForce 8400 GS PCI
2.08 GPixel/s

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

GeForce GTS 250
48 GTexel/s
GeForce 8400 GS PCI
4.16 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTS 250
483.8 GFLOPS
GeForce 8400 GS PCI
39.36 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

GeForce GTS 250  vs
8400 GS PCI 
GPU brand Nvidia Nvidia
GPU name G92 B1 G86
Market Desktop Desktop
Clock speed 750 MHz 520 MHz
Is dual GPU No No
Reference card Nvidia GeForce GTS 250 702 MHz 1 GB Nvidia GeForce 8400 GS PCI 520 MHz 512 MB

raw performance

Shading units 128 16
Texture mapping units 64 8
Render output processors 16 4
Pixel rate 12 GPixel/s 2.08 GPixel/s
Texture rate 48 GTexel/s 4.16 GTexel/s
Floating-point performance 483.8 GFLOPS 39.36 GFLOPS

memory

GeForce GTS 250  vs
8400 GS PCI 
Memory clock speed 1,150 MHz 500 MHz
Effective memory clock speed 2,300 MHz 1,000 MHz
Memory bus 256 bit 64 bit
Memory 1,024 MB 512 MB
Memory type GDDR3 DDR3
Memory bandwidth 73.6 GB/s 8 GB/s

noise and power

TDP 150W 40W

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