Radeon HD 4650 1GB vs Radeon R7 250

Intro

Compare that 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 memory bus, and makes use of a 28 nm design. It is made up of 384 SPUs, 24 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
Radeon R7 250		65 Watts
	Difference: 10 Watts (18%)

Memory Bandwidth

The Radeon R7 250, in theory, should be a lot faster than the Radeon HD 4650 1GB in general. (explain)

Radeon R7 250		73600 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 51200 (229%)

Texel Rate

The Radeon R7 250 is quite a bit (more or less 25%) more effective at texture filtering than the Radeon HD 4650 1GB. (explain)

Radeon R7 250		24000 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 4800 (25%)

Pixel Rate

The Radeon R7 250 should be much (about 67%) better at full screen anti-aliasing than the Radeon HD 4650 1GB, and able to handle higher resolutions better. (explain)

Radeon R7 250		8000 Mpixels/sec
Radeon HD 4650 1GB		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 largest amount of data (measured in MB per second) that can be moved past the external memory interface in a second. The number is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant 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.