Radeon HD 4770 vs Radeon R7 240

Intro

Compare all that to the Radeon R7 240, which features clock speeds of 730 MHz on the GPU, and 900 MHz on the 2048 MB of DDR3 memory. It features 320 SPUs as well as 20 Texture Address Units and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 240		30 Watts
Radeon HD 4770		80 Watts
	Difference: 50 Watts (167%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4770 should in theory be a lot better than the Radeon R7 240 overall. (explain)

Radeon HD 4770		51200 MB/sec
Radeon R7 240		28800 MB/sec
	Difference: 22400 (78%)

Texel Rate

The Radeon HD 4770 will be much (more or less 64%) more effective at AF than the Radeon R7 240. (explain)

Radeon HD 4770		24000 Mtexels/sec
Radeon R7 240		14600 Mtexels/sec
	Difference: 9400 (64%)

Pixel Rate

The Radeon HD 4770 is quite a bit (approximately 105%) faster with regards to anti-aliasing than the Radeon R7 240, and should be capable of handling higher screen resolutions better. (explain)

Radeon HD 4770		12000 Mpixels/sec
Radeon R7 240		5840 Mpixels/sec
	Difference: 6160 (105%)

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 max amount of data (in units of MB per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the 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 could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.