Radeon HD 4850 512MB vs Radeon R7 240

Intro

Compare those specifications to the Radeon R7 240, which comes with core speeds of 730 MHz on the GPU, and 900 MHz on the 2048 MB of DDR3 memory. It features 320 SPUs along with 20 TAUs and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 240		30 Watts
Radeon HD 4850 512MB		110 Watts
	Difference: 80 Watts (267%)

Memory Bandwidth

In theory, the Radeon HD 4850 512MB is 121% faster than the Radeon R7 240 overall, due to its higher data rate. (explain)

Radeon HD 4850 512MB		63552 MB/sec
Radeon R7 240		28800 MB/sec
	Difference: 34752 (121%)

Texel Rate

The Radeon HD 4850 512MB is a lot (approximately 71%) more effective at texture filtering than the Radeon R7 240. (explain)

Radeon HD 4850 512MB		25000 Mtexels/sec
Radeon R7 240		14600 Mtexels/sec
	Difference: 10400 (71%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 4850 512MB is superior to the Radeon R7 240, and very much so. (explain)

Radeon HD 4850 512MB		10000 Mpixels/sec
Radeon R7 240		5840 Mpixels/sec
	Difference: 4160 (71%)

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 (in units of megabytes per second) that can be transported past the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, the result should 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, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.