Radeon HD 4650 512MB vs Radeon R7 250

Intro

Compare those specs to the Radeon R7 250, which comes with a clock speed of 1000 MHz and a GDDR5 memory speed of 1150 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It is made up of 384 SPUs, 24 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB		55 Watts
Radeon R7 250		65 Watts
	Difference: 10 Watts (18%)

Memory Bandwidth

Theoretically speaking, the Radeon R7 250 will be 360% quicker than the Radeon HD 4650 512MB overall, due to its greater bandwidth. (explain)

Radeon R7 250		73600 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 57600 (360%)

Texel Rate

The Radeon R7 250 will be a lot (about 25%) faster with regards to AF than the Radeon HD 4650 512MB. (explain)

Radeon R7 250		24000 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 4800 (25%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R7 250 is superior to the Radeon HD 4650 512MB, and very much so. (explain)

Radeon R7 250		8000 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 3200 (67%)

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 (in units of MB per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 can be applied in one second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.