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GeForce 820M vs GeForce 9400 GT 256MB

Intro

The GeForce 820M has core clock speeds of 719 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 memory. It features 96 SPUs along with 16 TAUs and 4 Rasterization Operator Units.

Compare all that to the GeForce 9400 GT 256MB, which has a clock speed of 550 MHz and a GDDR2 memory speed of 400 MHz. It also features a 128-bit bus, and uses a 65 nm design. It is comprised of 16 SPUs, 8 Texture Address Units, and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M 15 Watts
GeForce 9400 GT 256MB 50 Watts
Difference: 35 Watts (233%)

Memory Bandwidth

Theoretically speaking, the GeForce 820M is 25% faster than the GeForce 9400 GT 256MB in general, because of its higher data rate. (explain)

GeForce 820M 16000 MB/sec
GeForce 9400 GT 256MB 12800 MB/sec
Difference: 3200 (25%)

Texel Rate

The GeForce 820M is a lot (about 161%) more effective at texture filtering than the GeForce 9400 GT 256MB. (explain)

GeForce 820M 11504 Mtexels/sec
GeForce 9400 GT 256MB 4400 Mtexels/sec
Difference: 7104 (161%)

Pixel Rate

The GeForce 820M will be much (approximately 31%) better at AA than the GeForce 9400 GT 256MB, and should be capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce 820M 2876 Mpixels/sec
GeForce 9400 GT 256MB 2200 Mpixels/sec
Difference: 676 (31%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

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GeForce 820M

Amazon.com

Check prices at:

GeForce 9400 GT 256MB

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce 820M GeForce 9400 GT 256MB
Manufacturer nVidia nVidia
Year February 2014 August 2008
Code Name GF117 G96a
Memory 2048 MB 256 MB
Core Speed 719 MHz 550 MHz
Memory Speed 2000 MHz 800 MHz
Power (Max TDP) 15 watts 50 watts
Bandwidth 16000 MB/sec 12800 MB/sec
Texel Rate 11504 Mtexels/sec 4400 Mtexels/sec
Pixel Rate 2876 Mpixels/sec 2200 Mpixels/sec
Unified Shaders 96 16
Texture Mapping Units 16 8
Render Output Units 4 4
Bus Type DDR3 GDDR2
Bus Width 64-bit 128-bit
Fab Process 28 nm 65 nm
Transistors (Unknown) million 314 million
Bus PCIe 2.0 x16 PCIe x16 2.0, PCI
DirectX Version DirectX 12 DirectX 10
OpenGL Version OpenGL 4.5 OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of data (in units of megabytes per second) that can be transferred over the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce 820M

Amazon.com

Check prices at:

GeForce 9400 GT 256MB

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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