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GeForce 8400 GS 512MB vs Radeon HD 6770

Intro

The GeForce 8400 GS 512MB features a GPU core speed of 650 MHz, and the 512 MB of DDR2 RAM runs at 400 MHz through a 64-bit bus. It also features 16 SPUs, 8 TAUs, and 4 Raster Operation Units.

Compare those specs to the Radeon HD 6770, which features clock speeds of 900 MHz on the GPU, and 1050 MHz on the 512 MB of GDDR5 RAM. It features 800 SPUs as well as 40 TAUs and 16 Rasterization Operator 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 better than 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 (approximately 592%) more effective at AF 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 lots of anti-aliasing is important to you, then the Radeon HD 6770 is superior to the GeForce 8400 GS 512MB, and very much so. (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: Bandwidth is the largest amount of data (measured in megabytes per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines 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 output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

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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