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GeForce 8400 GS 512MB vs Radeon HD 4670 512MB

Intro

The GeForce 8400 GS 512MB makes use of a 80 nm design. nVidia has clocked the core frequency at 650 MHz. The DDR2 RAM runs at a frequency of 400 MHz on this particular card. It features 16 SPUs as well as 8 TAUs and 4 ROPs.

Compare all that to the Radeon HD 4670 512MB, which features a GPU core clock speed of 750 MHz, and 512 MB of GDDR4/GDDR3/DDR3/DDR2 RAM set to run at 1000 MHz through a 128-bit bus. It also features 320(64x5) SPUs, 32 TAUs, and 8 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB 40 Watts
Radeon HD 4670 512MB 70 Watts
Difference: 30 Watts (75%)

Memory Bandwidth

In theory, the Radeon HD 4670 512MB will be 400% faster than the GeForce 8400 GS 512MB overall, due to its greater bandwidth. (explain)

Radeon HD 4670 512MB 32000 MB/sec
GeForce 8400 GS 512MB 6400 MB/sec
Difference: 25600 (400%)

Texel Rate

The Radeon HD 4670 512MB is a lot (approximately 362%) better at texture filtering than the GeForce 8400 GS 512MB. (explain)

Radeon HD 4670 512MB 24000 Mtexels/sec
GeForce 8400 GS 512MB 5200 Mtexels/sec
Difference: 18800 (362%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 4670 512MB is superior to the GeForce 8400 GS 512MB, by a large margin. (explain)

Radeon HD 4670 512MB 6000 Mpixels/sec
GeForce 8400 GS 512MB 2600 Mpixels/sec
Difference: 3400 (131%)

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 4670 512MB

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 4670 512MB
Manufacturer nVidia AMD
Year June 2007 Sep 10, 2008
Code Name G86 RV730 XT
Memory 512 MB 512 MB
Core Speed 650 MHz 750 MHz
Memory Speed 800 MHz 2000 MHz
Power (Max TDP) 40 watts 70 watts
Bandwidth 6400 MB/sec 32000 MB/sec
Texel Rate 5200 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 6000 Mpixels/sec
Unified Shaders 16 320(64x5)
Texture Mapping Units 8 32
Render Output Units 4 8
Bus Type DDR2 GDDR4/GDDR3/DDR3/DDR2
Bus Width 64-bit 128-bit
Fab Process 80 nm 55 nm
Transistors 210 million 514 million
Bus PCIe x16, PCI PCIe 2.0 x16, AGP 8x
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the 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 can be processed per second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling 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 that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel 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 max fill rate.

Display Prices

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GeForce 8400 GS 512MB

Amazon.com

Check prices at:

Radeon HD 4670 512MB

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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