Radeon HD 7990 vs Radeon R7 240

Intro

Compare all of that to the Radeon R7 240, which features a GPU core clock speed of 730 MHz, and 2048 MB of DDR3 RAM set to run at 900 MHz through a 128-bit bus. It also is comprised of 320 Stream Processors, 20 Texture Address Units, and 8 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 7990		15520 points
Radeon R7 240		1218 points
	Difference: 14302 (1174%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 240		30 Watts
Radeon HD 7990		375 Watts
	Difference: 345 Watts (1150%)

Memory Bandwidth

The Radeon HD 7990 should in theory be much faster than the Radeon R7 240 overall. (explain)

Radeon HD 7990		576000 MB/sec
Radeon R7 240		28800 MB/sec
	Difference: 547200 (1900%)

Texel Rate

The Radeon HD 7990 is much (about 1566%) better at anisotropic filtering than the Radeon R7 240. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon R7 240		14600 Mtexels/sec
	Difference: 228600 (1566%)

Pixel Rate

The Radeon HD 7990 should be quite a bit (approximately 941%) more effective at AA than the Radeon R7 240, and should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon R7 240		5840 Mpixels/sec
	Difference: 54960 (941%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in MB per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.