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GeForce 9800 GX2 vs Radeon HD 4670 512MB

Intro

The GeForce 9800 GX2 uses a 65 nm design. nVidia has clocked the core frequency at 600 MHz. The GDDR3 RAM runs at a frequency of 1000 MHz on this specific card. It features 128 SPUs along with 64 Texture Address Units and 16 Rasterization Operator Units.

Compare that to the Radeon HD 4670 512MB, which features a clock frequency of 750 MHz and a GDDR4/GDDR3/DDR3/DDR2 memory speed of 1000 MHz. It also makes use of a 128-bit bus, and uses a 55 nm design. It is comprised of 320(64x5) SPUs, 32 TAUs, and 8 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB 70 Watts
GeForce 9800 GX2 197 Watts
Difference: 127 Watts (181%)

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GX2 should perform a lot faster than the Radeon HD 4670 512MB overall. (explain)

GeForce 9800 GX2 128000 MB/sec
Radeon HD 4670 512MB 32000 MB/sec
Difference: 96000 (300%)

Texel Rate

The GeForce 9800 GX2 is much (about 220%) faster with regards to AF than the Radeon HD 4670 512MB. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
Radeon HD 4670 512MB 24000 Mtexels/sec
Difference: 52800 (220%)

Pixel Rate

If using a high resolution is important to you, then the GeForce 9800 GX2 is a better choice, and very much so. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
Radeon HD 4670 512MB 6000 Mpixels/sec
Difference: 13200 (220%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce 9800 GX2

Amazon.com

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Radeon HD 4670 512MB

Amazon.com

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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 9800 GX2 Radeon HD 4670 512MB
Manufacturer nVidia AMD
Year Mar 2008 Sep 10, 2008
Code Name G92 RV730 XT
Memory 512 MB (x2) 512 MB
Core Speed 600 MHz (x2) 750 MHz
Memory Speed 2000 MHz (x2) 2000 MHz
Power (Max TDP) 197 watts 70 watts
Bandwidth 128000 MB/sec 32000 MB/sec
Texel Rate 76800 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 19200 Mpixels/sec 6000 Mpixels/sec
Unified Shaders 128 (x2) 320(64x5)
Texture Mapping Units 64 (x2) 32
Render Output Units 16 (x2) 8
Bus Type GDDR3 GDDR4/GDDR3/DDR3/DDR2
Bus Width 256-bit (x2) 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 (in units of megabytes per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs 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 rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce 9800 GX2

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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