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GeForce 9800 GT 1GB vs Radeon HD 4850 X2 512MB

Intro

The GeForce 9800 GT 1GB features a clock frequency of 600 MHz and a GDDR3 memory speed of 900 MHz. It also uses a 256-bit bus, and makes use of a 65/55 nm design. It is made up of 112 SPUs, 56 TAUs, and 16 Raster Operation Units.

Compare all that to the Radeon HD 4850 X2 512MB, which makes use of a 55 nm design. AMD has clocked the core frequency at 625 MHz. The GDDR3 RAM runs at a speed of 993 MHz on this card. It features 800(160x5) SPUs as well as 40 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9800 GT 1GB 105 Watts
Radeon HD 4850 X2 512MB 250 Watts
Difference: 145 Watts (138%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 X2 512MB should be much faster than the GeForce 9800 GT 1GB in general. (explain)

Radeon HD 4850 X2 512MB 127104 MB/sec
GeForce 9800 GT 1GB 57600 MB/sec
Difference: 69504 (121%)

Texel Rate

The Radeon HD 4850 X2 512MB will be much (more or less 49%) more effective at AF than the GeForce 9800 GT 1GB. (explain)

Radeon HD 4850 X2 512MB 50000 Mtexels/sec
GeForce 9800 GT 1GB 33600 Mtexels/sec
Difference: 16400 (49%)

Pixel Rate

The Radeon HD 4850 X2 512MB is quite a bit (approximately 108%) faster with regards to anti-aliasing than the GeForce 9800 GT 1GB, and should be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 4850 X2 512MB 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 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 GT 1GB Radeon HD 4850 X2 512MB
Manufacturer nVidia AMD
Year July 2008 Nov 7, 2008
Code Name G92a/b R700
Memory 1024 MB 512 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 data (in units of megabytes per second) that can be moved past the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 amount of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core 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 processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output 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

Hide Prices

GeForce 9800 GT 1GB

Amazon.com

Check prices at:

Radeon HD 4850 X2 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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