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GeForce 9800 GX2 vs Radeon HD 5750 1GB


Intro

The GeForce 9800 GX2 comes with a core clock speed of 600 MHz and a GDDR3 memory frequency of 1000 MHz. It also features a 256-bit bus, and uses a 65 nm design. It is comprised of 128 SPUs, 64 TAUs, and 16 ROPs.

Compare all of that to the Radeon HD 5750 1GB, which has GPU clock speed of 700 MHz, and 1024 MB of GDDR5 memory running at 1150 MHz through a 128-bit bus. It also is comprised of 720(144x5) SPUs, 36 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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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 is 74% faster than the Radeon HD 5750 1GB overall, due to its greater data rate. (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

If using lots of anti-aliasing is important to you, then the GeForce 9800 GX2 is superior to the Radeon HD 5750 1GB, and very much so. (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

GeForce 9800 GX2

Radeon HD 5750 1GB

Specifications

Display 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 data (measured in MB per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

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

GeForce 9800 GX2

Radeon HD 5750 1GB

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