Radeon HD 4650 512MB vs Radeon R7 250X 2GB

Intro

Compare those specs to the Radeon R7 250X 2GB, which features a GPU core clock speed of 1000 MHz, and 2048 MB of GDDR5 memory running at 1125 MHz through a 128-bit bus. It also features 640 Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB		55 Watts
Radeon R7 250X 2GB		95 Watts
	Difference: 40 Watts (73%)

Memory Bandwidth

Theoretically speaking, the Radeon R7 250X 2GB will be 350% quicker than the Radeon HD 4650 512MB overall, because of its higher bandwidth. (explain)

Radeon R7 250X 2GB		72000 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 56000 (350%)

Texel Rate

The Radeon R7 250X 2GB is much (about 108%) better at texture filtering than the Radeon HD 4650 512MB. (explain)

Radeon R7 250X 2GB		40000 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 20800 (108%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R7 250X 2GB is superior to the Radeon HD 4650 512MB, by a large margin. (explain)

Radeon R7 250X 2GB		16000 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 11200 (233%)

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 max amount of data (counted in megabytes per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 once 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 anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, 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 most pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.