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GeForce 9800 GTX vs Radeon HD 4850 512MB

Intro

The GeForce 9800 GTX comes with a clock speed of 675 MHz and a GDDR3 memory frequency of 1100 MHz. It also uses a 256-bit bus, and makes use of a 65 nm design. It is made up of 128 SPUs, 64 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 4850 512MB, which comes with core speeds of 625 MHz on the GPU, and 993 MHz on the 512 MB of GDDR3 RAM. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 512MB 110 Watts
GeForce 9800 GTX 140 Watts
Difference: 30 Watts (27%)

Memory Bandwidth

In theory, the GeForce 9800 GTX is 11% faster than the Radeon HD 4850 512MB overall, because of its higher data rate. (explain)

GeForce 9800 GTX 70400 MB/sec
Radeon HD 4850 512MB 63552 MB/sec
Difference: 6848 (11%)

Texel Rate

The GeForce 9800 GTX will be much (about 73%) better at AF than the Radeon HD 4850 512MB. (explain)

GeForce 9800 GTX 43200 Mtexels/sec
Radeon HD 4850 512MB 25000 Mtexels/sec
Difference: 18200 (73%)

Pixel Rate

The GeForce 9800 GTX will be a little bit (more or less 8%) faster with regards to anti-aliasing than the Radeon HD 4850 512MB, and should be able to handle higher screen resolutions more effectively. (explain)

GeForce 9800 GTX 10800 Mpixels/sec
Radeon HD 4850 512MB 10000 Mpixels/sec
Difference: 800 (8%)

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.

Price Comparison

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GeForce 9800 GTX

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 GTX Radeon HD 4850 512MB
Manufacturer nVidia AMD
Year April 2008 Jun 25, 2008
Code Name G92 RV770 PRO
Memory 512 MB 512 MB
Core Speed 675 MHz 625 MHz
Memory Speed 2200 MHz 1986 MHz
Power (Max TDP) 140 watts 110 watts
Bandwidth 70400 MB/sec 63552 MB/sec
Texel Rate 43200 Mtexels/sec 25000 Mtexels/sec
Pixel Rate 10800 Mpixels/sec 10000 Mpixels/sec
Unified Shaders 128 800(160x5)
Texture Mapping Units 64 40
Render Output Units 16 16
Bus Type GDDR3 GDDR3
Bus Width 256-bit 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 (measured in MB per second) that can be transported past the external memory interface within a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, 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 is worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - 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 GTX

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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