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GeForce 9800 GTX+ vs Radeon HD 4850 X2 1GB

Intro

The GeForce 9800 GTX+ uses a 55 nm design. nVidia has set the core frequency at 738 MHz. The GDDR3 memory runs at a speed of 1100 MHz on this model. It features 128 SPUs as well as 64 Texture Address Units and 16 ROPs.

Compare those specifications to the Radeon HD 4850 X2 1GB, which comes with clock speeds of 625 MHz on the GPU, and 993 MHz on the 1024 MB of GDDR3 RAM. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator 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

The Radeon HD 4850 X2 1GB should in theory perform a lot faster than the GeForce 9800 GTX+ in general. (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 is just a bit (approximately 6%) faster with regards to texture filtering 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

If using a high resolution is important to you, then the Radeon HD 4850 X2 1GB is superior to the GeForce 9800 GTX+, and very much so. (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: Memory bandwidth is the max amount of data (measured in MB per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster 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 per second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at 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 the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum 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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