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GeForce 9800 GTX+ vs Radeon HD 4850 X2 1GB

Intro

The GeForce 9800 GTX+ features a clock frequency of 738 MHz and a GDDR3 memory speed of 1100 MHz. It also uses a 256-bit bus, and makes use of a 55 nm design. It is made up of 128 SPUs, 64 Texture Address Units, and 16 Raster Operation Units.

Compare all of that to the Radeon HD 4850 X2 1GB, which has a GPU core clock speed of 625 MHz, and 1024 MB of GDDR3 memory set to run at 993 MHz through a 256-bit bus. It also features 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9800 GTX+ 145 Watts
Radeon HD 4850 X2 1GB 250 Watts
Difference: 105 Watts (72%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 X2 1GB is 81% faster than the GeForce 9800 GTX+ in general, because of its higher data rate. (explain)

Radeon HD 4850 X2 1GB 127104 MB/sec
GeForce 9800 GTX+ 70400 MB/sec
Difference: 56704 (81%)

Texel Rate

The Radeon HD 4850 X2 1GB should be a little bit (more or less 6%) better at AF than the GeForce 9800 GTX+. (explain)

Radeon HD 4850 X2 1GB 50000 Mtexels/sec
GeForce 9800 GTX+ 47232 Mtexels/sec
Difference: 2768 (6%)

Pixel Rate

The Radeon HD 4850 X2 1GB should be quite a bit (about 69%) better at anti-aliasing than the GeForce 9800 GTX+, and also should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 4850 X2 1GB 20000 Mpixels/sec
GeForce 9800 GTX+ 11808 Mpixels/sec
Difference: 8192 (69%)

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 GTX+

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 GTX+ Radeon HD 4850 X2 1GB
Manufacturer nVidia AMD
Year July 2008 Nov 7, 2008
Code Name G92b R700
Memory 512 MB 1024 MB (x2)
Core Speed 738 MHz 625 MHz (x2)
Memory Speed 2200 MHz 1986 MHz (x2)
Power (Max TDP) 145 watts 250 watts
Bandwidth 70400 MB/sec 127104 MB/sec
Texel Rate 47232 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 11808 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 128 800(160x5) (x2)
Texture Mapping Units 64 40 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR3 GDDR3
Bus Width 256-bit 256-bit (x2)
Fab Process 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 data (in units of megabytes per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce 9800 GTX+

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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