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GeForce 9800 GTX+ vs Radeon HD 4850 X2 1GB

Intro

The GeForce 9800 GTX+ comes with a GPU core clock speed of 738 MHz, and the 512 MB of GDDR3 memory runs at 1100 MHz through a 256-bit bus. It also is made up of 128 SPUs, 64 Texture Address Units, and 16 ROPs.

Compare all of that to the Radeon HD 4850 X2 1GB, which makes use of a 55 nm design. AMD has clocked the core speed at 625 MHz. The GDDR3 memory runs at a speed of 993 MHz on this particular card. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

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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

Performance-wise, the Radeon HD 4850 X2 1GB should in theory be a lot better than the GeForce 9800 GTX+ overall. (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 will be a little bit (about 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

The Radeon HD 4850 X2 1GB is a lot (more or less 69%) better at full screen anti-aliasing than the GeForce 9800 GTX+, and also able to handle higher resolutions without losing too much performance. (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 maximum amount of data (counted in MB per second) that can be transferred past the external memory interface within a second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's 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 number of texture map elements (texels) that can be processed per 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 higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. 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 output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

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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