Radeon HD 4650 1GB vs Radeon R9 M295X

Intro

Compare all that to the Radeon R9 M295X, which has GPU clock speed of 750 MHz, and 4096 MB of GDDR5 memory set to run at 1375 MHz through a 256-bit bus. It also is made up of 2048 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
Radeon R9 M295X		125 Watts
	Difference: 70 Watts (127%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 M295X should be 686% faster than the Radeon HD 4650 1GB in general, due to its higher data rate. (explain)

Radeon R9 M295X		176000 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 153600 (686%)

Texel Rate

The Radeon R9 M295X will be a lot (more or less 400%) more effective at texture filtering than the Radeon HD 4650 1GB. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 76800 (400%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 M295X is a better choice, by a large margin. (explain)

Radeon R9 M295X		24000 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 19200 (400%)

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: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.