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GeForce 9800 GX2 vs Radeon HD 5750 1GB

Intro

The GeForce 9800 GX2 has a GPU core speed of 600 MHz, and the 512 MB of GDDR3 memory runs at 1000 MHz through a 256-bit bus. It also features 128 Stream Processors, 64 TAUs, and 16 Raster Operation Units.

Compare that to the Radeon HD 5750 1GB, which features core clock speeds of 700 MHz on the GPU, and 1150 MHz on the 1024 MB of GDDR5 memory. It features 720(144x5) SPUs as well as 36 Texture Address Units and 16 Rasterization Operator Units.

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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

Performance-wise, the GeForce 9800 GX2 should theoretically be quite a bit superior to the Radeon HD 5750 1GB overall. (explain)

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

Texel Rate

The GeForce 9800 GX2 is a lot (about 205%) better at AF 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 will be a lot (about 71%) faster with regards to FSAA than the Radeon HD 5750 1GB, and able to handle higher resolutions while still performing well. (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 maximum amount of information (counted in MB per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total texture units 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 per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

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