GeForce GT 450 (OEM) vs Radeon HD 7950 3GB

Intro

Compare those specifications to the Radeon HD 7950 3GB, which features a core clock frequency of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 384-bit bus, and makes use of a 28 nm design. It is comprised of 1792 SPUs, 112 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 450 (OEM)		106 Watts
Radeon HD 7950 3GB		200 Watts
	Difference: 94 Watts (89%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7950 3GB will be 150% quicker than the GeForce GT 450 (OEM) overall, due to its greater bandwidth. (explain)

Radeon HD 7950 3GB		240000 MB/sec
GeForce GT 450 (OEM)		96000 MB/sec
	Difference: 144000 (150%)

Texel Rate

The Radeon HD 7950 3GB is quite a bit (about 373%) more effective at anisotropic filtering than the GeForce GT 450 (OEM). (explain)

Radeon HD 7950 3GB		89600 Mtexels/sec
GeForce GT 450 (OEM)		18960 Mtexels/sec
	Difference: 70640 (373%)

Pixel Rate

The Radeon HD 7950 3GB is much (approximately 35%) more effective at full screen anti-aliasing than the GeForce GT 450 (OEM), and able to handle higher resolutions more effectively. (explain)

Radeon HD 7950 3GB		25600 Mpixels/sec
GeForce GT 450 (OEM)		18960 Mpixels/sec
	Difference: 6640 (35%)

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.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in MB per second) that can be transported past the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

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