GeForce GT 450 (OEM) vs Radeon HD 7970

Intro

Compare those specs to the Radeon HD 7970, which has GPU core speed of 925 MHz, and 3072 MB of GDDR5 RAM running at 1375 MHz through a 384-bit bus. It also is comprised of 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 450 (OEM)		106 Watts
Radeon HD 7970		250 Watts
	Difference: 144 Watts (136%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7970 should be 175% quicker than the GeForce GT 450 (OEM) overall, due to its higher data rate. (explain)

Radeon HD 7970		264000 MB/sec
GeForce GT 450 (OEM)		96000 MB/sec
	Difference: 168000 (175%)

Texel Rate

The Radeon HD 7970 will be much (approximately 524%) faster with regards to anisotropic filtering than the GeForce GT 450 (OEM). (explain)

Radeon HD 7970		118400 Mtexels/sec
GeForce GT 450 (OEM)		18960 Mtexels/sec
	Difference: 99440 (524%)

Pixel Rate

The Radeon HD 7970 should be quite a bit (about 56%) more effective at AA than the GeForce GT 450 (OEM), and will be able to handle higher resolutions better. (explain)

Radeon HD 7970		29600 Mpixels/sec
GeForce GT 450 (OEM)		18960 Mpixels/sec
	Difference: 10640 (56%)

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: Memory bandwidth is the largest amount of data (measured in megabytes per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

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