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Differences What are the advantages of each

Front view of GeForce GT 9800

Reasons to consider the
Nvidia GeForce GT 9800

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Higher memory bandwidth 57.6 GB/s vs 12.8 GB/s Around 4.5x higher memory bandwidth
Higher effective memory clock speed 1,800 MHz vs 800 MHz 2.2x higher effective memory clock speed
More texture mapping units 56 vs 8 48 more texture mapping units
Higher texture rate 33.6 GTexel/s vs 4.4 GTexel/s Around 7.8x higher texture rate
Significantly higher memory clock speed 900 MHz vs 400 MHz 2.2x higher memory clock speed
More render output processors 16 vs 4 12 more render output processors
Slightly higher pixel rate 9.6 GPixel/s vs 2.2 GPixel/s More than 4.2x higher pixel rate
Wider memory bus 256 bit vs 128 bit 2x wider memory bus
Front view of GeForce GT 9400

Reasons to consider the
Nvidia GeForce GT 9400

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Lower TDP 50W vs 125W 2.5x lower TDP

Benchmarks Real world tests of GeForce GT 9800 vs 9400

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the GeForce GT 9800  vs 9400 

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

GeForce GT 9800
57.6 GB/s
GeForce GT 9400
12.8 GB/s

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

GeForce GT 9800
9.6 GPixel/s
GeForce GT 9400
2.2 GPixel/s

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

GeForce GT 9800
33.6 GTexel/s
GeForce GT 9400
4.4 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GT 9800
336 GFLOPS
GeForce GT 9400
44.8 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

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