Radeon HD 4650 1GB vs Radeon R7 240

Intro

Compare those specifications to the Radeon R7 240, which uses a 28 nm design. AMD has set the core speed at 730 MHz. The DDR3 memory runs at a frequency of 900 MHz on this model. It features 320 SPUs along with 20 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 240		30 Watts
Radeon HD 4650 1GB		55 Watts
	Difference: 25 Watts (83%)

Memory Bandwidth

As far as performance goes, the Radeon R7 240 should theoretically be quite a bit better than the Radeon HD 4650 1GB in general. (explain)

Radeon R7 240		28800 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 6400 (29%)

Texel Rate

The Radeon HD 4650 1GB will be quite a bit (more or less 32%) more effective at texture filtering than the Radeon R7 240. (explain)

Radeon HD 4650 1GB		19200 Mtexels/sec
Radeon R7 240		14600 Mtexels/sec
	Difference: 4600 (32%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R7 240 is the winner, and very much so. (explain)

Radeon R7 240		5840 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 1040 (22%)

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 (in units of megabytes per second) that can be transferred over the external memory interface in a second. The number is worked out by multiplying the bus 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 4 instead. The higher the memory bandwidth, the faster 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 are applied per second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.