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GeForce 9800 GTX vs Radeon HD 4830 512MB

Intro

The GeForce 9800 GTX uses a 65 nm design. nVidia has clocked the core speed at 675 MHz. The GDDR3 memory runs at a frequency of 1100 MHz on this particular model. It features 128 SPUs along with 64 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 4830 512MB, which makes use of a 55 nm design. AMD has set the core speed at 575 MHz. The GDDR3 memory works at a speed of 900 MHz on this specific card. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB 95 Watts
GeForce 9800 GTX 140 Watts
Difference: 45 Watts (47%)

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GTX is 22% faster than the Radeon HD 4830 512MB overall, because of its higher data rate. (explain)

GeForce 9800 GTX 70400 MB/sec
Radeon HD 4830 512MB 57600 MB/sec
Difference: 12800 (22%)

Texel Rate

The GeForce 9800 GTX should be much (more or less 135%) better at anisotropic filtering than the Radeon HD 4830 512MB. (explain)

GeForce 9800 GTX 43200 Mtexels/sec
Radeon HD 4830 512MB 18400 Mtexels/sec
Difference: 24800 (135%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce 9800 GTX is a better choice, but only just. (explain)

GeForce 9800 GTX 10800 Mpixels/sec
Radeon HD 4830 512MB 9200 Mpixels/sec
Difference: 1600 (17%)

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 9800 GTX

Amazon.com

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Radeon HD 4830 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 GTX Radeon HD 4830 512MB
Manufacturer nVidia AMD
Year April 2008 Oct 21, 2008
Code Name G92 RV770 LE
Memory 512 MB 512 MB
Core Speed 675 MHz 575 MHz
Memory Speed 2200 MHz 1800 MHz
Power (Max TDP) 140 watts 95 watts
Bandwidth 70400 MB/sec 57600 MB/sec
Texel Rate 43200 Mtexels/sec 18400 Mtexels/sec
Pixel Rate 10800 Mpixels/sec 9200 Mpixels/sec
Unified Shaders 128 640(128x5)
Texture Mapping Units 64 32
Render Output Units 16 16
Bus Type GDDR3 GDDR3
Bus Width 256-bit 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: Bandwidth is the max amount of data (measured in MB per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

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

Display Prices

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GeForce 9800 GTX

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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