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GeForce 8400 GS 512MB vs Radeon HD 5850

Intro

The GeForce 8400 GS 512MB comes with a core clock speed of 650 MHz and a DDR2 memory frequency of 400 MHz. It also features a 64-bit bus, and makes use of a 80 nm design. It is comprised of 16 SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

Compare that to the Radeon HD 5850, which has a core clock speed of 725 MHz and a GDDR5 memory speed of 1000 MHz. It also uses a 256-bit memory bus, and uses a 40 nm design. It features 1440(288x5) SPUs, 72 TAUs, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB 40 Watts
Radeon HD 5850 151 Watts
Difference: 111 Watts (278%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5850 should be 1900% faster than the GeForce 8400 GS 512MB overall, due to its higher data rate. (explain)

Radeon HD 5850 128000 MB/sec
GeForce 8400 GS 512MB 6400 MB/sec
Difference: 121600 (1900%)

Texel Rate

The Radeon HD 5850 is much (about 904%) faster with regards to anisotropic filtering than the GeForce 8400 GS 512MB. (explain)

Radeon HD 5850 52200 Mtexels/sec
GeForce 8400 GS 512MB 5200 Mtexels/sec
Difference: 47000 (904%)

Pixel Rate

The Radeon HD 5850 is a lot (more or less 792%) better at AA than the GeForce 8400 GS 512MB, and should be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 5850 23200 Mpixels/sec
GeForce 8400 GS 512MB 2600 Mpixels/sec
Difference: 20600 (792%)

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 8400 GS 512MB

Amazon.com

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Radeon HD 5850

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 8400 GS 512MB Radeon HD 5850
Manufacturer nVidia AMD
Year June 2007 September 30, 2009
Code Name G86 Cypress PRO
Memory 512 MB 1024 MB
Core Speed 650 MHz 725 MHz
Memory Speed 800 MHz 4000 MHz
Power (Max TDP) 40 watts 151 watts
Bandwidth 6400 MB/sec 128000 MB/sec
Texel Rate 5200 Mtexels/sec 52200 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 23200 Mpixels/sec
Unified Shaders 16 1440(288x5)
Texture Mapping Units 8 72
Render Output Units 4 32
Bus Type DDR2 GDDR5
Bus Width 64-bit 256-bit
Fab Process 80 nm 40 nm
Transistors 210 million 2154 million
Bus PCIe x16, PCI PCIe 2.1 x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved over the external memory interface in a second. It is calculated by multiplying the bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total 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 processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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GeForce 8400 GS 512MB

Amazon.com

Check prices at:

Radeon HD 5850

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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