Radeon HD 4650 1GB vs Radeon R9 M280X

Intro

Compare all of that to the Radeon R9 M280X, which has core speeds of 900 MHz on the GPU, and 1375 MHz on the 4096 MB of GDDR5 memory. It features 896 SPUs along with 56 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
Radeon R9 M280X		75 Watts
	Difference: 20 Watts (36%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 M280X will be 293% quicker than the Radeon HD 4650 1GB overall, due to its greater bandwidth. (explain)

Radeon R9 M280X		88000 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 65600 (293%)

Texel Rate

The Radeon R9 M280X should be much (approximately 163%) more effective at texture filtering than the Radeon HD 4650 1GB. (explain)

Radeon R9 M280X		50400 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 31200 (163%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 M280X is a better choice, by far. (explain)

Radeon R9 M280X		14400 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 9600 (200%)

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

Specifications

Memory Bandwidth: Bandwidth is the max amount of data (in units of megabytes per second) that can be transported over the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number 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 outputting the pixels (image) to 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 ability to reach the maximum fill rate.