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GeForce 9800 GX2 vs Radeon HD 4850 1GB

Intro

The GeForce 9800 GX2 features clock speeds of 600 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR3 RAM. It features 128 SPUs as well as 64 Texture Address Units and 16 ROPs.

Compare that to the Radeon HD 4850 1GB, which makes use of a 55 nm design. AMD has clocked the core speed at 625 MHz. The GDDR4 RAM is set to run at a speed of 993 MHz on this card. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 1GB 110 Watts
GeForce 9800 GX2 197 Watts
Difference: 87 Watts (79%)

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GX2 should be quite a bit faster than the Radeon HD 4850 1GB overall. (explain)

GeForce 9800 GX2 128000 MB/sec
Radeon HD 4850 1GB 63552 MB/sec
Difference: 64448 (101%)

Texel Rate

The GeForce 9800 GX2 will be much (approximately 207%) faster with regards to AF than the Radeon HD 4850 1GB. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
Radeon HD 4850 1GB 25000 Mtexels/sec
Difference: 51800 (207%)

Pixel Rate

The GeForce 9800 GX2 will be a lot (about 92%) better at FSAA than the Radeon HD 4850 1GB, and capable of handling higher resolutions without losing too much performance. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
Radeon HD 4850 1GB 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 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 GX2 Radeon HD 4850 1GB
Manufacturer nVidia AMD
Year Mar 2008 Jun 25, 2008
Code Name G92 RV770 PRO
Memory 512 MB (x2) 1024 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 GDDR4
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: Bandwidth is the largest amount of data (measured in MB per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the interface width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the clock 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 is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce 9800 GX2

Amazon.com

Check prices at:

Radeon HD 4850 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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