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GeForce 8800 GT 512MB vs Radeon HD 4670 1GB

Intro

The GeForce 8800 GT 512MB features clock speeds of 600 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 memory. It features 112 SPUs as well as 56 TAUs and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 4670 1GB, which makes use of a 55 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR4/GDDR3/DDR3/DDR2 memory works at a speed of 1100 MHz on this specific model. It features 320(64x5) SPUs along with 32 TAUs and 8 ROPs.

Tom Clancy's H.A.W.X

Settings: High Quality
AA: 4x
AF: 8x
Resolution: 1680x1050
Test Machine: Tom's Hardware Charts Test Rig (Source)
GeForce 8800 GT 512MB 32 FPS
Radeon HD 4670 1GB 21 FPS
Difference: 11 FPS (52%)

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

The GeForce 8800 GT 512MB, in theory, should be a lot 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 quite a bit (approximately 40%) better at anisotropic 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

The GeForce 8800 GT 512MB should be a lot (approximately 60%) faster with regards to AA than the Radeon HD 4670 1GB, and should be capable of handling higher screen resolutions more effectively. (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

GeForce 8800 GT 512MB

Amazon.com

Radeon HD 4670 1GB

Amazon.com

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

Model GeForce 8800 GT 512MB Radeon HD 4670 1GB
Manufacturer nVidia AMD
Year Oct 2007 Sep 10, 2008
Code Name G92 RV730 XT
Fab Process 65 nm 55 nm
Bus PCIe x16 2.0 PCIe 2.0 x16, AGP 8x
Memory 512 MB 1024 MB
Core Speed 600 MHz 750 MHz
Shader Speed 1500 MHz (N/A) MHz
Memory Speed 900 MHz (1800 MHz effective) 1100 MHz (2200 MHz effective)
Unified Shaders 112 320(64x5)
Texture Mapping Units 56 32
Render Output Units 16 8
Bus Type GDDR3 GDDR4/GDDR3/DDR3/DDR2
Bus Width 256-bit 128-bit
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0
Power (Max TDP) 105 watts 70 watts
Shader Model 4.0 4.1
Bandwidth 57600 MB/sec 35200 MB/sec
Texel Rate 33600 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 6000 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of information (measured in MB per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the 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 applied per second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

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