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GeForce 9800 GT 1GB vs Radeon HD 4850 X2 1GB

Intro

The GeForce 9800 GT 1GB uses a 65/55 nm design. nVidia has set the core frequency at 600 MHz. The GDDR3 RAM is set to run at a speed of 900 MHz on this particular card. It features 112 SPUs along with 56 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 4850 X2 1GB, which comes with GPU core speed of 625 MHz, and 1024 MB of GDDR3 RAM set to run at 993 MHz through a 256-bit bus. It also is made up of 800(160x5) Stream Processors, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9800 GT 1GB 105 Watts
Radeon HD 4850 X2 1GB 250 Watts
Difference: 145 Watts (138%)

Memory Bandwidth

In theory, the Radeon HD 4850 X2 1GB should be 121% faster than the GeForce 9800 GT 1GB in general, due to its greater data rate. (explain)

Radeon HD 4850 X2 1GB 127104 MB/sec
GeForce 9800 GT 1GB 57600 MB/sec
Difference: 69504 (121%)

Texel Rate

The Radeon HD 4850 X2 1GB will be quite a bit (about 49%) faster with regards to AF than the GeForce 9800 GT 1GB. (explain)

Radeon HD 4850 X2 1GB 50000 Mtexels/sec
GeForce 9800 GT 1GB 33600 Mtexels/sec
Difference: 16400 (49%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 4850 X2 1GB is a better choice, by a large margin. (explain)

Radeon HD 4850 X2 1GB 20000 Mpixels/sec
GeForce 9800 GT 1GB 9600 Mpixels/sec
Difference: 10400 (108%)

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 GT 1GB

Amazon.com

Check prices at:

Radeon HD 4850 X2 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 GT 1GB Radeon HD 4850 X2 1GB
Manufacturer nVidia AMD
Year July 2008 Nov 7, 2008
Code Name G92a/b R700
Memory 1024 MB 1024 MB (x2)
Core Speed 600 MHz 625 MHz (x2)
Memory Speed 1800 MHz 1986 MHz (x2)
Power (Max TDP) 105 watts 250 watts
Bandwidth 57600 MB/sec 127104 MB/sec
Texel Rate 33600 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 112 800(160x5) (x2)
Texture Mapping Units 56 40 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR3 GDDR3
Bus Width 256-bit 256-bit (x2)
Fab Process 65/55 nm 55 nm
Transistors 754 million 956 million
Bus PCIe x16 2.0 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of information (measured in MB per second) that can be transported past the external memory interface in one second. The number is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, it must 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 anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the graphics 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 number of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce 9800 GT 1GB

Amazon.com

Check prices at:

Radeon HD 4850 X2 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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