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Radeon HD 4830 1GB vs Radeon R9 M275X

Intro

The Radeon HD 4830 1GB comes with a GPU core clock speed of 575 MHz, and the 1024 MB of GDDR4 memory is set to run at 900 MHz through a 256-bit bus. It also features 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare all that to the Radeon R9 M275X, which has a clock speed of 900 MHz and a GDDR5 memory frequency of 1125 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It is comprised of 640 SPUs, 40 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Radeon HD 4830 1GB		95 Watts
	Difference: 45 Watts (90%)

Memory Bandwidth

In theory, the Radeon R9 M275X will be 25% faster than the Radeon HD 4830 1GB in general, because of its greater bandwidth. (explain)

Radeon R9 M275X		72000 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 14400 (25%)

Texel Rate

The Radeon R9 M275X will be a lot (more or less 96%) better at anisotropic filtering than the Radeon HD 4830 1GB. (explain)

Radeon R9 M275X		36000 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 17600 (96%)

Pixel Rate

The Radeon R9 M275X will be quite a bit (approximately 57%) faster with regards to AA than the Radeon HD 4830 1GB, and also able to handle higher screen resolutions without slowing down too much. (explain)

Radeon R9 M275X		14400 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 5200 (57%)

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 4830 1GB

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Radeon R9 M275X

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Specifications

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Model	Radeon HD 4830 1GB	Radeon R9 M275X
Manufacturer	AMD	AMD
Year	Oct 21, 2008	May 1 2014
Code Name	RV770 LE	Venus XTX
Memory	1024 MB	2048 MB
Core Speed	575 MHz	900 MHz
Memory Speed	1800 MHz	4500 MHz
Power (Max TDP)	95 watts	50 watts
Bandwidth	57600 MB/sec	72000 MB/sec
Texel Rate	18400 Mtexels/sec	36000 Mtexels/sec
Pixel Rate	9200 Mpixels/sec	14400 Mpixels/sec
Unified Shaders	640(128x5)	640
Texture Mapping Units	32	40
Render Output Units	16	16
Bus Type	GDDR4	GDDR5
Bus Width	256-bit	128-bit
Fab Process	55 nm	28 nm
Transistors	956 million	(Unknown) million
Bus	PCIe 2.0 x16	PCIe 3.0 x16
DirectX Version	DirectX 10.1	DirectX 11.2
OpenGL Version	OpenGL 3.0	OpenGL 4.3

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the bus width by its memory 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 memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total number 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 applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka 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 - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

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