Radeon HD 4550 256MB vs Radeon R7 250

Intro

Compare those specifications to the Radeon R7 250, which has GPU core speed of 1000 MHz, and 1024 MB of GDDR5 RAM set to run at 1150 MHz through a 128-bit bus. It also features 384 Stream Processors, 24 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4550 256MB		25 Watts
Radeon R7 250		65 Watts
	Difference: 40 Watts (160%)

Memory Bandwidth

As far as performance goes, the Radeon R7 250 should theoretically be quite a bit better than the Radeon HD 4550 256MB in general. (explain)

Radeon R7 250		73600 MB/sec
Radeon HD 4550 256MB		12800 MB/sec
	Difference: 60800 (475%)

Texel Rate

The Radeon R7 250 is much (approximately 400%) more effective at AF than the Radeon HD 4550 256MB. (explain)

Radeon R7 250		24000 Mtexels/sec
Radeon HD 4550 256MB		4800 Mtexels/sec
	Difference: 19200 (400%)

Pixel Rate

The Radeon R7 250 will be quite a bit (about 233%) better at full screen anti-aliasing than the Radeon HD 4550 256MB, and also able to handle higher screen resolutions while still performing well. (explain)

Radeon R7 250		8000 Mpixels/sec
Radeon HD 4550 256MB		2400 Mpixels/sec
	Difference: 5600 (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 largest amount of data (measured in MB per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the bus width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of 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 output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.