GeForce GT 450 (OEM) vs Radeon HD 7970

Intro

Compare all of that to the Radeon HD 7970, which uses a 28 nm design. AMD has set the core frequency at 925 MHz. The GDDR5 RAM works at a speed of 1375 MHz on this specific model. It features 2048 SPUs along with 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 7970		250 Watts
	Difference: 144 Watts (136%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7970 is 175% faster than the GeForce GT 450 (OEM) overall, because of its greater 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 is quite a bit (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

If using high levels of AA is important to you, then the Radeon HD 7970 is a better choice, and very much so. (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: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the 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 number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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