GeForce GTX 260 Core 216 vs Radeon HD 7990

Intro

Compare all that 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 GTX 260 Core 216		202 Watts
Radeon HD 7990		375 Watts
	Difference: 173 Watts (86%)

Memory Bandwidth

In theory, the Radeon HD 7990 will be 415% faster than the GeForce GTX 260 Core 216 in general, due to its greater bandwidth. (explain)

Radeon HD 7990		576000 MB/sec
GeForce GTX 260 Core 216		111888 MB/sec
	Difference: 464112 (415%)

Texel Rate

The Radeon HD 7990 is much (more or less 486%) more effective at texture filtering than the GeForce GTX 260 Core 216. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce GTX 260 Core 216		41472 Mtexels/sec
	Difference: 201728 (486%)

Pixel Rate

The Radeon HD 7990 will be a lot (approximately 277%) faster with regards to FSAA than the GeForce GTX 260 Core 216, and capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce GTX 260 Core 216		16128 Mpixels/sec
	Difference: 44672 (277%)

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 (in units of megabytes per second) that can be moved over the external memory interface in one second. The number is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines 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 fill 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.