GeForce GT 315 vs Radeon HD 6990

Intro

Compare all of that to the Radeon HD 6990, which comes with a clock speed of 830 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 256-bit memory bus, and uses a 40 nm design. It is comprised of 1536 SPUs, 96 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 315		52 Watts
Radeon HD 6990		375 Watts
	Difference: 323 Watts (621%)

Memory Bandwidth

The Radeon HD 6990 should in theory be much faster than the GeForce GT 315 in general. (explain)

Radeon HD 6990		320000 MB/sec
GeForce GT 315		25280 MB/sec
	Difference: 294720 (1166%)

Texel Rate

The Radeon HD 6990 will be a lot (approximately 1494%) more effective at texture filtering than the GeForce GT 315. (explain)

Radeon HD 6990		159360 Mtexels/sec
GeForce GT 315		10000 Mtexels/sec
	Difference: 149360 (1494%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6990 is superior to the GeForce GT 315, and very much so. (explain)

Radeon HD 6990		53120 Mpixels/sec
GeForce GT 315		5000 Mpixels/sec
	Difference: 48120 (962%)

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 max amount of data (counted in megabytes per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the bus width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster 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 are applied in one second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.