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GeForce 9800 GX2 vs Radeon HD 5750 1GB

Intro

The GeForce 9800 GX2 uses a 65 nm design. nVidia has clocked the core frequency at 600 MHz. The GDDR3 RAM runs at a speed of 1000 MHz on this particular model. It features 128 SPUs along with 64 TAUs and 16 ROPs.

Compare that to the Radeon HD 5750 1GB, which makes use of a 40 nm design. AMD has clocked the core frequency at 700 MHz. The GDDR5 memory works at a frequency of 1150 MHz on this particular model. It features 720(144x5) SPUs as well as 36 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 1GB 86 Watts
GeForce 9800 GX2 197 Watts
Difference: 111 Watts (129%)

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GX2 should perform a lot faster than the Radeon HD 5750 1GB in general. (explain)

GeForce 9800 GX2 128000 MB/sec
Radeon HD 5750 1GB 73600 MB/sec
Difference: 54400 (74%)

Texel Rate

The GeForce 9800 GX2 will be quite a bit (approximately 205%) better at anisotropic filtering than the Radeon HD 5750 1GB. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
Radeon HD 5750 1GB 25200 Mtexels/sec
Difference: 51600 (205%)

Pixel Rate

The GeForce 9800 GX2 should be a lot (approximately 71%) more effective at anti-aliasing than the Radeon HD 5750 1GB, and also capable of handling higher resolutions without losing too much performance. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
Radeon HD 5750 1GB 11200 Mpixels/sec
Difference: 8000 (71%)

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

Radeon HD 5750 1GB

Amazon.com

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 5750 1GB
Manufacturer nVidia AMD
Year Mar 2008 October 13, 2009
Code Name G92 Juniper LE
Memory 512 MB (x2) 1024 MB
Core Speed 600 MHz (x2) 700 MHz
Memory Speed 2000 MHz (x2) 4600 MHz
Power (Max TDP) 197 watts 86 watts
Bandwidth 128000 MB/sec 73600 MB/sec
Texel Rate 76800 Mtexels/sec 25200 Mtexels/sec
Pixel Rate 19200 Mpixels/sec 11200 Mpixels/sec
Unified Shaders 128 (x2) 720(144x5)
Texture Mapping Units 64 (x2) 36
Render Output Units 16 (x2) 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 65 nm 40 nm
Transistors 754 million 1040 million
Bus PCIe x16 2.0 PCIe 2.1 x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in MB per second) that can be transported past the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This is calculated 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 video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the clock 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 output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

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