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GeForce 8800 GT 512MB vs Radeon HD 4670 1GB


The GeForce 8800 GT 512MB uses a 65 nm design. nVidia has clocked the core frequency at 600 MHz. The GDDR3 RAM works at a frequency of 900 MHz on this particular model. It features 112 SPUs along with 56 Texture Address Units and 16 Rasterization Operator Units.

Compare that to the Radeon HD 4670 1GB, which comes with a GPU core clock speed of 750 MHz, and 1024 MB of GDDR4/GDDR3/DDR3/DDR2 RAM set to run at 1100 MHz through a 128-bit bus. It also is comprised of 320(64x5) Stream Processors, 32 Texture Address Units, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 1GB 70 Watts
GeForce 8800 GT 512MB 105 Watts
Difference: 35 Watts (50%)

Memory Bandwidth

Theoretically, the GeForce 8800 GT 512MB should perform quite a bit faster than the Radeon HD 4670 1GB in general. (explain)

GeForce 8800 GT 512MB 57600 MB/sec
Radeon HD 4670 1GB 35200 MB/sec
Difference: 22400 (64%)

Texel Rate

The GeForce 8800 GT 512MB will be a lot (more or less 40%) more effective at texture filtering than the Radeon HD 4670 1GB. (explain)

GeForce 8800 GT 512MB 33600 Mtexels/sec
Radeon HD 4670 1GB 24000 Mtexels/sec
Difference: 9600 (40%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce 8800 GT 512MB is superior to the Radeon HD 4670 1GB, by a large margin. (explain)

GeForce 8800 GT 512MB 9600 Mpixels/sec
Radeon HD 4670 1GB 6000 Mpixels/sec
Difference: 3600 (60%)

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 8800 GT 512MB

Radeon HD 4670 1GB

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.


Display Specifications

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Model GeForce 8800 GT 512MB Radeon HD 4670 1GB
Manufacturer nVidia AMD
Year Oct 2007 Sep 10, 2008
Code Name G92 RV730 XT
Memory 512 MB 1024 MB
Core Speed 600 MHz 750 MHz
Memory Speed 1800 MHz 2200 MHz
Power (Max TDP) 105 watts 70 watts
Bandwidth 57600 MB/sec 35200 MB/sec
Texel Rate 33600 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 6000 Mpixels/sec
Unified Shaders 112 320(64x5)
Texture Mapping Units 56 32
Render Output Units 16 8
Bus Width 256-bit 128-bit
Fab Process 65 nm 55 nm
Transistors 754 million 514 million
Bus PCIe x16 2.0 PCIe 2.0 x16, AGP 8x
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of information (counted in MB per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.


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