GeForce GTX 465 vs Radeon HD 7990

Intro

Compare those specifications to the Radeon HD 7990, which uses a 28 nm design. AMD has clocked the core speed at 950 MHz. The GDDR5 RAM is set to run at a frequency of 1500 MHz on this particular model. It features 2048 SPUs along with 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 465		200 Watts
Radeon HD 7990		375 Watts
	Difference: 175 Watts (88%)

Memory Bandwidth

The Radeon HD 7990, in theory, should perform a lot faster than the GeForce GTX 465 in general. (explain)

Radeon HD 7990		576000 MB/sec
GeForce GTX 465		102592 MB/sec
	Difference: 473408 (461%)

Texel Rate

The Radeon HD 7990 will be quite a bit (approximately 811%) faster with regards to AF than the GeForce GTX 465. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce GTX 465		26708 Mtexels/sec
	Difference: 216492 (811%)

Pixel Rate

The Radeon HD 7990 should be a lot (more or less 213%) faster with regards to anti-aliasing than the GeForce GTX 465, and also will be able to handle higher resolutions while still performing well. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce GTX 465		19424 Mpixels/sec
	Difference: 41376 (213%)

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 transferred over the external memory interface in a second. It's calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number of texture units by the core 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 processed in a second.

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