Radeon HD 3650 512MB vs Radeon R9 M275X

Intro

Compare all that to the Radeon R9 M275X, which features GPU clock speed of 900 MHz, and 2048 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Radeon HD 3650 512MB		78 Watts
	Difference: 28 Watts (56%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 M275X will be 181% faster than the Radeon HD 3650 512MB in general, because of its higher data rate. (explain)

Radeon R9 M275X		72000 MB/sec
Radeon HD 3650 512MB		25600 MB/sec
	Difference: 46400 (181%)

Texel Rate

The Radeon R9 M275X will be a lot (about 521%) faster with regards to texture filtering than the Radeon HD 3650 512MB. (explain)

Radeon R9 M275X		36000 Mtexels/sec
Radeon HD 3650 512MB		5800 Mtexels/sec
	Difference: 30200 (521%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R9 M275X is the winner, by a large margin. (explain)

Radeon R9 M275X		14400 Mpixels/sec
Radeon HD 3650 512MB		2900 Mpixels/sec
	Difference: 11500 (397%)

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 maximum amount of data (counted in MB per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 amount of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling 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 card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.