GeForce GTS 150 vs Radeon HD 7990

Intro

Compare those specifications to the Radeon HD 7990, which has a GPU core clock speed of 950 MHz, and 3072 MB of GDDR5 memory running at 1500 MHz through a 384-bit bus. It also is made up of 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 150		141 Watts
Radeon HD 7990		375 Watts
	Difference: 234 Watts (166%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7990 should be a lot faster than the GeForce GTS 150 in general. (explain)

Radeon HD 7990		576000 MB/sec
GeForce GTS 150		32000 MB/sec
	Difference: 544000 (1700%)

Texel Rate

The Radeon HD 7990 will be quite a bit (approximately 414%) more effective at anisotropic filtering than the GeForce GTS 150. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce GTS 150		47360 Mtexels/sec
	Difference: 195840 (414%)

Pixel Rate

The Radeon HD 7990 is quite a bit (about 414%) faster with regards to anti-aliasing than the GeForce GTS 150, and should be capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce GTS 150		11840 Mpixels/sec
	Difference: 48960 (414%)

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 information (counted in megabytes per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 once again. If 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 higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). 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 potential to get to the max fill rate.