Radeon HD 7990 vs Radeon R7 240

Intro

Compare those specs to the Radeon R7 240, which has GPU core speed of 730 MHz, and 2048 MB of DDR3 memory running at 900 MHz through a 128-bit bus. It also features 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

As far as performance goes, the Radeon HD 7990 should theoretically be quite a bit better 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%) faster with regards to AF than the Radeon R7 240. (explain)

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

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 7990 is superior to the Radeon R7 240, and very much so. (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 largest amount of information (counted in megabytes per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This 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 processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.