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GeForce 8400 GS 512MB vs Radeon HD 6770

Intro

The GeForce 8400 GS 512MB has core clock speeds of 650 MHz on the GPU, and 400 MHz on the 512 MB of DDR2 memory. It features 16 SPUs along with 8 Texture Address Units and 4 ROPs.

Compare those specs to the Radeon HD 6770, which uses a 40 nm design. AMD has set the core speed at 900 MHz. The GDDR5 memory works at a speed of 1050 MHz on this particular card. It features 800 SPUs along with 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

In theory, the Radeon HD 6770 will be 950% faster than the GeForce 8400 GS 512MB overall, because of its higher data rate. (explain)

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

Texel Rate

The Radeon HD 6770 should be much (more or less 592%) faster with regards to anisotropic 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

The Radeon HD 6770 will be quite a bit (approximately 454%) more effective at FSAA than the GeForce 8400 GS 512MB, and should be able to handle higher screen resolutions more effectively. (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 maximum amount of data (in units of MB per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the bus width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If 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, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total amount of texture units by the core clock 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 processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum 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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