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GeForce 8400 GS 512MB vs Radeon HD 6770

Intro

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

Compare those specifications to the Radeon HD 6770, which comes with a core clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It is comprised of 800 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB 40 Watts
Radeon HD 6770 108 Watts
Difference: 68 Watts (170%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6770 should in theory be much superior to the GeForce 8400 GS 512MB in general. (explain)

Radeon HD 6770 67200 MB/sec
GeForce 8400 GS 512MB 6400 MB/sec
Difference: 60800 (950%)

Texel Rate

The Radeon HD 6770 is quite a bit (more or less 592%) better at texture filtering than the GeForce 8400 GS 512MB. (explain)

Radeon HD 6770 36000 Mtexels/sec
GeForce 8400 GS 512MB 5200 Mtexels/sec
Difference: 30800 (592%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6770 is a better choice, by far. (explain)

Radeon HD 6770 14400 Mpixels/sec
GeForce 8400 GS 512MB 2600 Mpixels/sec
Difference: 11800 (454%)

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

Check prices at:

Radeon HD 6770

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 6770
Manufacturer nVidia AMD
Year June 2007 January 2011
Code Name G86 Juniper XT
Memory 512 MB 512 MB
Core Speed 650 MHz 900 MHz
Memory Speed 800 MHz 4200 MHz
Power (Max TDP) 40 watts 108 watts
Bandwidth 6400 MB/sec 67200 MB/sec
Texel Rate 5200 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 16 800
Texture Mapping Units 8 40
Render Output Units 4 16
Bus Type DDR2 GDDR5
Bus Width 64-bit 128-bit
Fab Process 80 nm 40 nm
Transistors 210 million 1040 million
Bus PCIe x16, PCI PCIe x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the interface width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount 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 fill rate is also dependant on quite a few other factors, especially 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 6770

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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