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Radeon HD 4750 vs Radeon HD 5830

Intro

The Radeon HD 4750 comes with a GPU core speed of 730 MHz, and the 512 MB of GDDR5 memory is set to run at 800 MHz through a 128-bit bus. It also features 640(128x5) Stream Processors, 32 Texture Address Units, and 16 Raster Operation Units.

Compare that to the Radeon HD 5830, which makes use of a 40 nm design. AMD has clocked the core speed at 800 MHz. The GDDR5 memory runs at a frequency of 1000 MHz on this model. It features 1120(224x5) SPUs as well as 56 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
Radeon HD 5830		175 Watts
	Difference: 100 Watts (133%)

Memory Bandwidth

Performance-wise, the Radeon HD 5830 should in theory be a lot better than the Radeon HD 4750 in general. (explain)

Radeon HD 5830		128000 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 76800 (150%)

Texel Rate

The Radeon HD 5830 should be quite a bit (approximately 92%) more effective at anisotropic filtering than the Radeon HD 4750. (explain)

Radeon HD 5830		44800 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 21440 (92%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 5830 is superior to the Radeon HD 4750, though only just barely. (explain)

Radeon HD 5830		12800 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 1120 (10%)

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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Radeon HD 4750

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Radeon HD 5830

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Specifications

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Model	Radeon HD 4750	Radeon HD 5830
Manufacturer	AMD	AMD
Year		February 25, 2010
Code Name	RV740	Cypress LE
Memory	512 MB	1024 MB
Core Speed	730 MHz	800 MHz
Memory Speed	3200 MHz	4000 MHz
Power (Max TDP)	75 watts	175 watts
Bandwidth	51200 MB/sec	128000 MB/sec
Texel Rate	23360 Mtexels/sec	44800 Mtexels/sec
Pixel Rate	11680 Mpixels/sec	12800 Mpixels/sec
Unified Shaders	640(128x5)	1120(224x5)
Texture Mapping Units	32	56
Render Output Units	16	16
Bus Type	GDDR5	GDDR5
Bus Width	128-bit	256-bit
Fab Process	40 nm	40 nm
Transistors	826 million	2154 million
Bus	PCIe 2.0 x16	PCIe 2.1 x16
DirectX Version	DirectX 10.1	DirectX 11
OpenGL Version	OpenGL 3.0	OpenGL 3.2

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in MB per second) that can be moved across the external memory interface in one second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR memory, it must 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the video card will be at handling 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 graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

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