Radeon HD 3650 vs Radeon R7 250X 2GB

Intro

Compare all of that to the Radeon R7 250X 2GB, which features a clock frequency of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650		78 Watts
Radeon R7 250X 2GB		95 Watts
	Difference: 17 Watts (22%)

Memory Bandwidth

Theoretically speaking, the Radeon R7 250X 2GB should be 181% quicker than the Radeon HD 3650 in general, due to its greater data rate. (explain)

Radeon R7 250X 2GB		72000 MB/sec
Radeon HD 3650		25600 MB/sec
	Difference: 46400 (181%)

Texel Rate

The Radeon R7 250X 2GB should be a lot (about 590%) more effective at anisotropic filtering than the Radeon HD 3650. (explain)

Radeon R7 250X 2GB		40000 Mtexels/sec
Radeon HD 3650		5800 Mtexels/sec
	Difference: 34200 (590%)

Pixel Rate

The Radeon R7 250X 2GB should be much (about 452%) better at full screen anti-aliasing than the Radeon HD 3650, and also will be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon R7 250X 2GB		16000 Mpixels/sec
Radeon HD 3650		2900 Mpixels/sec
	Difference: 13100 (452%)

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 maximum amount of data (counted in MB per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the clock speed of the card. 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 quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.