Radeon HD 4650 512MB vs Radeon R9 M295X

Intro

Compare those specifications to the Radeon R9 M295X, which comes with GPU core speed of 750 MHz, and 4096 MB of GDDR5 RAM 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 512MB		55 Watts
Radeon R9 M295X		125 Watts
	Difference: 70 Watts (127%)

Memory Bandwidth

Theoretically, the Radeon R9 M295X should be quite a bit faster than the Radeon HD 4650 512MB in general. (explain)

Radeon R9 M295X		176000 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 160000 (1000%)

Texel Rate

The Radeon R9 M295X will be much (approximately 400%) more effective at AF than the Radeon HD 4650 512MB. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon HD 4650 512MB		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 far. (explain)

Radeon R9 M295X		24000 Mpixels/sec
Radeon HD 4650 512MB		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: Bandwidth is the largest amount of information (in units of MB per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card 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 clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.