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GeForce 820M vs GeForce 9400 GT 256MB

Intro

The GeForce 820M has 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 Texture Address Units and 4 ROPs.

Compare those specs to the GeForce 9400 GT 256MB, which features core clock speeds of 550 MHz on the GPU, and 400 MHz on the 256 MB of GDDR2 memory. It features 16 SPUs along with 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 should be quite a bit faster than the GeForce 9400 GT 256MB overall. (explain)

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

Texel Rate

The GeForce 820M should be a lot (approximately 161%) faster with regards to AF than the GeForce 9400 GT 256MB. (explain)

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

Pixel Rate

If running with a high resolution is important to you, then the GeForce 820M is superior to the GeForce 9400 GT 256MB, and very much so. (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

Display Prices

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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

Display 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 maximum amount of data (in units of MB per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 can be applied per second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record 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 clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max 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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