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Radeon HD 4750 vs Radeon HD 5830

Intro

The Radeon HD 4750 features a clock speed of 730 MHz and a GDDR5 memory frequency of 800 MHz. It also uses a 128-bit memory bus, and makes use of a 40 nm design. It is comprised of 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 5830, which comes with core clock speeds of 800 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 memory. It features 1120(224x5) SPUs along with 56 TAUs 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

Theoretically speaking, the Radeon HD 5830 is 150% quicker than the Radeon HD 4750 overall, due to its greater data rate. (explain)

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

Texel Rate

The Radeon HD 5830 is quite a bit (more or less 92%) more effective at texture filtering than the Radeon HD 4750. (explain)

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

Pixel Rate

The Radeon HD 5830 will be just a bit (more or less 10%) more effective at anti-aliasing than the Radeon HD 4750, and will be able to handle higher resolutions without slowing down too much. (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 maximum amount of data (in units of MB per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the bus width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher 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 in one second.

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

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