GeForce GTX 590 vs Radeon HD 7990

Intro

Compare all of that to the Radeon HD 7990, which features core clock speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 RAM. It features 2048 SPUs as well as 128 Texture Address Units and 32 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
GeForce GTX 590		6680 points
	Difference: 8840 (132%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 590		365 Watts
Radeon HD 7990		375 Watts
	Difference: 10 Watts (3%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7990 should be 75% quicker than the GeForce GTX 590 overall, due to its higher bandwidth. (explain)

Radeon HD 7990		576000 MB/sec
GeForce GTX 590		328320 MB/sec
	Difference: 247680 (75%)

Texel Rate

The Radeon HD 7990 will be much (approximately 213%) faster with regards to AF than the GeForce GTX 590. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce GTX 590		77696 Mtexels/sec
	Difference: 165504 (213%)

Pixel Rate

The Radeon HD 7990 will be just a bit (approximately 4%) more effective at full screen anti-aliasing than the GeForce GTX 590, and able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce GTX 590		58272 Mpixels/sec
	Difference: 2528 (4%)

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: Memory bandwidth is the largest amount of information (measured in MB per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the bus width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.