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GeForce 9800 GX2 vs Radeon HD 4850 512MB

Intro

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

Compare that to the Radeon HD 4850 512MB, which comes with a core clock frequency of 625 MHz and a GDDR3 memory speed of 993 MHz. It also uses a 256-bit bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 512MB 110 Watts
GeForce 9800 GX2 197 Watts
Difference: 87 Watts (79%)

Memory Bandwidth

The GeForce 9800 GX2, in theory, should perform a lot faster than the Radeon HD 4850 512MB overall. (explain)

GeForce 9800 GX2 128000 MB/sec
Radeon HD 4850 512MB 63552 MB/sec
Difference: 64448 (101%)

Texel Rate

The GeForce 9800 GX2 is quite a bit (more or less 207%) more effective at texture filtering than the Radeon HD 4850 512MB. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
Radeon HD 4850 512MB 25000 Mtexels/sec
Difference: 51800 (207%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce 9800 GX2 is the winner, and very much so. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
Radeon HD 4850 512MB 10000 Mpixels/sec
Difference: 9200 (92%)

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 4850 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 4850 512MB
Manufacturer nVidia AMD
Year Mar 2008 Jun 25, 2008
Code Name G92 RV770 PRO
Memory 512 MB (x2) 512 MB
Core Speed 600 MHz (x2) 625 MHz
Memory Speed 2000 MHz (x2) 1986 MHz
Power (Max TDP) 197 watts 110 watts
Bandwidth 128000 MB/sec 63552 MB/sec
Texel Rate 76800 Mtexels/sec 25000 Mtexels/sec
Pixel Rate 19200 Mpixels/sec 10000 Mpixels/sec
Unified Shaders 128 (x2) 800(160x5)
Texture Mapping Units 64 (x2) 40
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 max amount of information (measured in MB per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many 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 4850 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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