GeForce GT 450 (OEM) vs Radeon HD 6790

Intro

Compare those specifications to the Radeon HD 6790, which comes with a GPU core clock speed of 840 MHz, and 1024 MB of GDDR5 memory running at 1050 MHz through a 256-bit bus. It also is comprised of 800 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 450 (OEM)		106 Watts
Radeon HD 6790		150 Watts
	Difference: 44 Watts (42%)

Memory Bandwidth

The Radeon HD 6790 should theoretically be much faster than the GeForce GT 450 (OEM) in general. (explain)

Radeon HD 6790		134400 MB/sec
GeForce GT 450 (OEM)		96000 MB/sec
	Difference: 38400 (40%)

Texel Rate

The Radeon HD 6790 will be much (about 77%) more effective at texture filtering than the GeForce GT 450 (OEM). (explain)

Radeon HD 6790		33600 Mtexels/sec
GeForce GT 450 (OEM)		18960 Mtexels/sec
	Difference: 14640 (77%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GT 450 (OEM) is the winner, by far. (explain)

GeForce GT 450 (OEM)		18960 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 5520 (41%)

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 maximum amount of information (in units of megabytes per second) that can be transferred across the external memory interface in one second. It's worked out by multiplying the bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, 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 graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core 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, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.