Radeon HD 3650 256MB vs Radeon R7 240

Intro

Compare those specs to the Radeon R7 240, which has a clock frequency of 730 MHz and a DDR3 memory frequency of 900 MHz. It also features a 128-bit memory bus, and makes use of a 28 nm design. It is made up of 320 SPUs, 20 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 240		30 Watts
Radeon HD 3650 256MB		78 Watts
	Difference: 48 Watts (160%)

Memory Bandwidth

The Radeon R7 240 should in theory be a small bit faster than the Radeon HD 3650 256MB overall. (explain)

Radeon R7 240		28800 MB/sec
Radeon HD 3650 256MB		25600 MB/sec
	Difference: 3200 (13%)

Texel Rate

The Radeon R7 240 is much (about 152%) more effective at texture filtering than the Radeon HD 3650 256MB. (explain)

Radeon R7 240		14600 Mtexels/sec
Radeon HD 3650 256MB		5800 Mtexels/sec
	Difference: 8800 (152%)

Pixel Rate

The Radeon R7 240 is a lot (more or less 101%) better at anti-aliasing than the Radeon HD 3650 256MB, and also will be capable of handling higher screen resolutions while still performing well. (explain)

Radeon R7 240		5840 Mpixels/sec
Radeon HD 3650 256MB		2900 Mpixels/sec
	Difference: 2940 (101%)

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 data (measured in MB per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better 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 number of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the 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 chip can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.