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GeForce 9800 GX2 vs Radeon HD 4830 1GB

Intro

The GeForce 9800 GX2 features a core clock speed of 600 MHz and a GDDR3 memory speed of 1000 MHz. It also features a 256-bit memory bus, and makes use of a 65 nm design. It features 128 SPUs, 64 TAUs, and 16 Raster Operation Units.

Compare all of that to the Radeon HD 4830 1GB, which comes with GPU clock speed of 575 MHz, and 1024 MB of GDDR4 RAM running at 900 MHz through a 256-bit bus. It also is made up of 640(128x5) Stream Processors, 32 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 1GB 95 Watts
GeForce 9800 GX2 197 Watts
Difference: 102 Watts (107%)

Memory Bandwidth

Performance-wise, the GeForce 9800 GX2 should theoretically be quite a bit superior to the Radeon HD 4830 1GB in general. (explain)

GeForce 9800 GX2 128000 MB/sec
Radeon HD 4830 1GB 57600 MB/sec
Difference: 70400 (122%)

Texel Rate

The GeForce 9800 GX2 should be much (more or less 317%) more effective at anisotropic filtering than the Radeon HD 4830 1GB. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
Radeon HD 4830 1GB 18400 Mtexels/sec
Difference: 58400 (317%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce 9800 GX2 is superior to the Radeon HD 4830 1GB, by a large margin. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
Radeon HD 4830 1GB 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 1GB

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 1GB
Manufacturer nVidia AMD
Year Mar 2008 Oct 21, 2008
Code Name G92 RV770 LE
Memory 512 MB (x2) 1024 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 GDDR4
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: Bandwidth is the maximum amount of information (counted in MB per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better 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 texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels 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 amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - 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 4830 1GB

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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