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Radeon HD 4830 1GB vs Radeon R9 M275X

Intro

The Radeon HD 4830 1GB features a clock speed of 575 MHz and a GDDR4 memory frequency of 900 MHz. It also makes use of a 256-bit bus, and uses a 55 nm design. It is comprised of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare that to the Radeon R9 M275X, which uses a 28 nm design. AMD has clocked the core frequency at 900 MHz. The GDDR5 RAM runs at a frequency of 1125 MHz on this card. It features 640 SPUs along with 40 TAUs 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

Theoretically, the Radeon R9 M275X should be much faster than the Radeon HD 4830 1GB in general. (explain)

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

Texel Rate

The Radeon R9 M275X should be a lot (about 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 much (about 57%) more effective at FSAA than the Radeon HD 4830 1GB, and will be capable of handling higher resolutions while still performing well. (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: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card 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 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 also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

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