Radeon HD 4890 1GB vs Radeon R7 240

Intro

Compare those specifications to the Radeon R7 240, which has a clock speed of 730 MHz and a DDR3 memory frequency 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

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 240		30 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 160 Watts (533%)

Memory Bandwidth

Performance-wise, the Radeon HD 4890 1GB should theoretically be a lot superior to the Radeon R7 240 in general. (explain)

Radeon HD 4890 1GB		124800 MB/sec
Radeon R7 240		28800 MB/sec
	Difference: 96000 (333%)

Texel Rate

The Radeon HD 4890 1GB is a lot (about 174%) better at AF than the Radeon R7 240. (explain)

Radeon HD 4890 1GB		40000 Mtexels/sec
Radeon R7 240		14600 Mtexels/sec
	Difference: 25400 (174%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 4890 1GB is superior to the Radeon R7 240, and very much so. (explain)

Radeon HD 4890 1GB		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: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could 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 colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.