GeForce GT 450 (OEM) vs Radeon HD 7990

Intro

Compare all of that to the Radeon HD 7990, which uses a 28 nm design. AMD has clocked the core frequency at 950 MHz. The GDDR5 RAM works at a speed of 1500 MHz on this card. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 450 (OEM)		106 Watts
Radeon HD 7990		375 Watts
	Difference: 269 Watts (254%)

Memory Bandwidth

The Radeon HD 7990 should theoretically be much faster than the GeForce GT 450 (OEM) in general. (explain)

Radeon HD 7990		576000 MB/sec
GeForce GT 450 (OEM)		96000 MB/sec
	Difference: 480000 (500%)

Texel Rate

The Radeon HD 7990 will be quite a bit (more or less 1183%) better at texture filtering than the GeForce GT 450 (OEM). (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce GT 450 (OEM)		18960 Mtexels/sec
	Difference: 224240 (1183%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7990 is superior to the GeForce GT 450 (OEM), and very much so. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce GT 450 (OEM)		18960 Mpixels/sec
	Difference: 41840 (221%)

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 largest amount of information (measured in megabytes per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This is worked out by multiplying the total amount 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 in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.