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GeForce 9800 GX2 vs Radeon HD 4830 512MB

Intro

The GeForce 9800 GX2 makes use of a 65 nm design. nVidia has clocked the core frequency at 600 MHz. The GDDR3 memory is set to run at a speed of 1000 MHz on this specific model. It features 128 SPUs as well as 64 TAUs and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 4830 512MB, which has a core clock frequency of 575 MHz and a GDDR3 memory frequency of 900 MHz. It also makes use of a 256-bit bus, and uses a 55 nm design. It features 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB 95 Watts
GeForce 9800 GX2 197 Watts
Difference: 102 Watts (107%)

Memory Bandwidth

As far as performance goes, the GeForce 9800 GX2 should theoretically be a lot better than the Radeon HD 4830 512MB in general. (explain)

GeForce 9800 GX2 128000 MB/sec
Radeon HD 4830 512MB 57600 MB/sec
Difference: 70400 (122%)

Texel Rate

The GeForce 9800 GX2 should be much (more or less 317%) faster with regards to anisotropic filtering than the Radeon HD 4830 512MB. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
Radeon HD 4830 512MB 18400 Mtexels/sec
Difference: 58400 (317%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce 9800 GX2 is the winner, by far. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
Radeon HD 4830 512MB 9200 Mpixels/sec
Difference: 10000 (109%)

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

Check prices at:

Radeon HD 4830 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 9800 GX2 Radeon HD 4830 512MB
Manufacturer nVidia AMD
Year Mar 2008 Oct 21, 2008
Code Name G92 RV770 LE
Memory 512 MB (x2) 512 MB
Core Speed 600 MHz (x2) 575 MHz
Memory Speed 2000 MHz (x2) 1800 MHz
Power (Max TDP) 197 watts 95 watts
Bandwidth 128000 MB/sec 57600 MB/sec
Texel Rate 76800 Mtexels/sec 18400 Mtexels/sec
Pixel Rate 19200 Mpixels/sec 9200 Mpixels/sec
Unified Shaders 128 (x2) 640(128x5)
Texture Mapping Units 64 (x2) 32
Render Output Units 16 (x2) 16
Bus Type GDDR3 GDDR3
Bus Width 256-bit (x2) 256-bit
Fab Process 65 nm 55 nm
Transistors 754 million 956 million
Bus PCIe x16 2.0 PCIe 2.0 x16
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 number of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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GeForce 9800 GX2

Amazon.com

Check prices at:

Radeon HD 4830 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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