Radeon HD 4830 512MB vs Radeon R7 250

Intro

Compare that to the Radeon R7 250, which features GPU core speed of 1000 MHz, and 1024 MB of GDDR5 memory running at 1150 MHz through a 128-bit bus. It also is comprised of 384 Stream Processors, 24 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250		65 Watts
Radeon HD 4830 512MB		95 Watts
	Difference: 30 Watts (46%)

Memory Bandwidth

In theory, the Radeon R7 250 should perform a lot faster than the Radeon HD 4830 512MB in general. (explain)

Radeon R7 250		73600 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 16000 (28%)

Texel Rate

The Radeon R7 250 is quite a bit (approximately 30%) faster with regards to AF than the Radeon HD 4830 512MB. (explain)

Radeon R7 250		24000 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 5600 (30%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 4830 512MB is superior to the Radeon R7 250, though only just barely. (explain)

Radeon HD 4830 512MB		9200 Mpixels/sec
Radeon R7 250		8000 Mpixels/sec
	Difference: 1200 (15%)

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: Memory bandwidth is the largest amount of information (in units of MB per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill 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.