GeForce GT 315 vs Radeon HD 7990

Intro

Compare all that to the Radeon HD 7990, which has a clock frequency of 950 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 384-bit memory bus, and makes use of a 28 nm design. It is made up of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 315		52 Watts
Radeon HD 7990		375 Watts
	Difference: 323 Watts (621%)

Memory Bandwidth

In theory, the Radeon HD 7990 should be quite a bit faster than the GeForce GT 315 overall. (explain)

Radeon HD 7990		576000 MB/sec
GeForce GT 315		25280 MB/sec
	Difference: 550720 (2178%)

Texel Rate

The Radeon HD 7990 should be much (more or less 2332%) better at anisotropic filtering than the GeForce GT 315. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce GT 315		10000 Mtexels/sec
	Difference: 233200 (2332%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7990 is superior to the GeForce GT 315, by far. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce GT 315		5000 Mpixels/sec
	Difference: 55800 (1116%)

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 maximum amount of data (measured in megabytes per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.