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GeForce 8800 GTX vs Radeon HD 5750 1GB

Intro

The GeForce 8800 GTX features a core clock speed of 575 MHz and a GDDR3 memory speed of 900 MHz. It also features a 384-bit memory bus, and makes use of a 90 nm design. It is made up of 128 SPUs, 64 Texture Address Units, and 24 Raster Operation Units.

Compare all that to the Radeon HD 5750 1GB, which features a core clock speed of 700 MHz and a GDDR5 memory speed of 1150 MHz. It also makes use of a 128-bit bus, and makes use of a 40 nm design. It features 720(144x5) SPUs, 36 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 1GB		86 Watts
GeForce 8800 GTX		155 Watts
	Difference: 69 Watts (80%)

Memory Bandwidth

Theoretically speaking, the GeForce 8800 GTX should perform just a bit faster than the Radeon HD 5750 1GB in general. (explain)

GeForce 8800 GTX		86400 MB/sec
Radeon HD 5750 1GB		73600 MB/sec
	Difference: 12800 (17%)

Texel Rate

The GeForce 8800 GTX is quite a bit (about 46%) faster with regards to AF than the Radeon HD 5750 1GB. (explain)

GeForce 8800 GTX		36800 Mtexels/sec
Radeon HD 5750 1GB		25200 Mtexels/sec
	Difference: 11600 (46%)

Pixel Rate

The GeForce 8800 GTX will be much (more or less 23%) faster with regards to full screen anti-aliasing than the Radeon HD 5750 1GB, and able to handle higher screen resolutions while still performing well. (explain)

GeForce 8800 GTX		13800 Mpixels/sec
Radeon HD 5750 1GB		11200 Mpixels/sec
	Difference: 2600 (23%)

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.

Price Comparison

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GeForce 8800 GTX

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Radeon HD 5750 1GB

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Specifications

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Model	GeForce 8800 GTX	Radeon HD 5750 1GB
Manufacturer	nVidia	AMD
Year	Nov 2006	October 13, 2009
Code Name	G80	Juniper LE
Memory	768 MB	1024 MB
Core Speed	575 MHz	700 MHz
Memory Speed	1800 MHz	4600 MHz
Power (Max TDP)	155 watts	86 watts
Bandwidth	86400 MB/sec	73600 MB/sec
Texel Rate	36800 Mtexels/sec	25200 Mtexels/sec
Pixel Rate	13800 Mpixels/sec	11200 Mpixels/sec
Unified Shaders	128	720(144x5)
Texture Mapping Units	64	36
Render Output Units	24	16
Bus Type	GDDR3	GDDR5
Bus Width	384-bit	128-bit
Fab Process	90 nm	40 nm
Transistors	681 million	1040 million
Bus	PCIe x16	PCIe 2.1 x16
DirectX Version	DirectX 10	DirectX 11
OpenGL Version	OpenGL 3.0	OpenGL 3.2

Memory Bandwidth: Bandwidth is the largest amount of data (in units of megabytes per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 processed in one second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, 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 most pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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