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GeForce GTX 285 1GB vs Radeon HD 4670 512MB


Intro

The GeForce GTX 285 1GB uses a 55 nm design. nVidia has set the core speed at 648 MHz. The GDDR3 RAM runs at a speed of 1242 MHz on this particular card. It features 240 SPUs as well as 80 TAUs and 32 Rasterization Operator Units.

Compare those specs to the Radeon HD 4670 512MB, which makes use of a 55 nm design. AMD has clocked the core speed at 750 MHz. The GDDR4/GDDR3/DDR3/DDR2 RAM runs at a frequency of 1000 MHz on this specific model. It features 320(64x5) SPUs along with 32 TAUs and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB 70 Watts
GeForce GTX 285 1GB 204 Watts
Difference: 134 Watts (191%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 285 1GB should perform much faster than the Radeon HD 4670 512MB overall. (explain)

GeForce GTX 285 1GB 158976 MB/sec
Radeon HD 4670 512MB 32000 MB/sec
Difference: 126976 (397%)

Texel Rate

The GeForce GTX 285 1GB will be quite a bit (more or less 116%) better at texture filtering than the Radeon HD 4670 512MB. (explain)

GeForce GTX 285 1GB 51840 Mtexels/sec
Radeon HD 4670 512MB 24000 Mtexels/sec
Difference: 27840 (116%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 285 1GB is superior to the Radeon HD 4670 512MB, and very much so. (explain)

GeForce GTX 285 1GB 20736 Mpixels/sec
Radeon HD 4670 512MB 6000 Mpixels/sec
Difference: 14736 (246%)

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 GTX 285 1GB

Radeon HD 4670 512MB

Specifications

Display Specifications

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Model GeForce GTX 285 1GB Radeon HD 4670 512MB
Manufacturer nVidia AMD
Year January 15, 2009 Sep 10, 2008
Code Name G200b RV730 XT
Memory 1024 MB 512 MB
Core Speed 648 MHz 750 MHz
Memory Speed 2484 MHz 2000 MHz
Power (Max TDP) 204 watts 70 watts
Bandwidth 158976 MB/sec 32000 MB/sec
Texel Rate 51840 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 20736 Mpixels/sec 6000 Mpixels/sec
Unified Shaders 240 320(64x5)
Texture Mapping Units 80 32
Render Output Units 32 8
Bus Type GDDR3 GDDR4/GDDR3/DDR3/DDR2
Bus Width 512-bit 128-bit
Fab Process 55 nm 55 nm
Transistors 1400 million 514 million
Bus PCIe x16 2.0 PCIe 2.0 x16, AGP 8x
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.1 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in MB per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the 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 most pixels that the graphics chip could possibly record to its 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 core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

GeForce GTX 285 1GB

Radeon HD 4670 512MB

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