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Radeon HD 4750 vs Radeon HD 4830 512MB

Intro

The Radeon HD 4750 comes with a GPU clock speed of 730 MHz, and the 512 MB of GDDR5 RAM runs at 800 MHz through a 128-bit bus. It also is comprised of 640(128x5) Stream Processors, 32 Texture Address Units, and 16 ROPs.

Compare those specifications to the Radeon HD 4830 512MB, which features a clock frequency of 575 MHz and a GDDR3 memory frequency of 900 MHz. It also makes use of a 256-bit memory bus, and makes use of a 55 nm design. It is made up of 640(128x5) SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
Radeon HD 4830 512MB		95 Watts
	Difference: 20 Watts (27%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4830 512MB should in theory be a small bit superior to the Radeon HD 4750 overall. (explain)

Radeon HD 4830 512MB		57600 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 6400 (13%)

Texel Rate

The Radeon HD 4750 should be quite a bit (more or less 27%) faster with regards to anisotropic filtering than the Radeon HD 4830 512MB. (explain)

Radeon HD 4750		23360 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 4960 (27%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 4750 is a better choice, by a large margin. (explain)

Radeon HD 4750		11680 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 2480 (27%)

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 4830 512MB

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Specifications

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Model	Radeon HD 4750	Radeon HD 4830 512MB
Manufacturer	AMD	AMD
Year		Oct 21, 2008
Code Name	RV740	RV770 LE
Memory	512 MB	512 MB
Core Speed	730 MHz	575 MHz
Memory Speed	3200 MHz	1800 MHz
Power (Max TDP)	75 watts	95 watts
Bandwidth	51200 MB/sec	57600 MB/sec
Texel Rate	23360 Mtexels/sec	18400 Mtexels/sec
Pixel Rate	11680 Mpixels/sec	9200 Mpixels/sec
Unified Shaders	640(128x5)	640(128x5)
Texture Mapping Units	32	32
Render Output Units	16	16
Bus Type	GDDR5	GDDR3
Bus Width	128-bit	256-bit
Fab Process	40 nm	55 nm
Transistors	826 million	956 million
Bus	PCIe 2.0 x16	PCIe 2.0 x16
DirectX Version	DirectX 10.1	DirectX 10.1
OpenGL Version	OpenGL 3.0	OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of data (counted in megabytes per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once 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 anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

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