Radeon HD 4890 2GB vs Radeon R7 240

Intro

Compare all of that to the Radeon R7 240, which features a core clock speed of 730 MHz and a DDR3 memory speed of 900 MHz. It also makes use of a 128-bit bus, and uses a 28 nm design. It is comprised of 320 SPUs, 20 Texture Address Units, and 8 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 240		30 Watts
Radeon HD 4890 2GB		190 Watts
	Difference: 160 Watts (533%)

Memory Bandwidth

The Radeon HD 4890 2GB should in theory perform quite a bit faster than the Radeon R7 240 overall. (explain)

Radeon HD 4890 2GB		124800 MB/sec
Radeon R7 240		28800 MB/sec
	Difference: 96000 (333%)

Texel Rate

The Radeon HD 4890 2GB should be much (about 174%) more effective at anisotropic filtering than the Radeon R7 240. (explain)

Radeon HD 4890 2GB		40000 Mtexels/sec
Radeon R7 240		14600 Mtexels/sec
	Difference: 25400 (174%)

Pixel Rate

The Radeon HD 4890 2GB is much (about 174%) more effective at full screen anti-aliasing than the Radeon R7 240, and able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 4890 2GB		16000 Mpixels/sec
Radeon R7 240		5840 Mpixels/sec
	Difference: 10160 (174%)

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 information (counted in megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better 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 texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called 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 of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.