GeForce GT 450 (OEM) vs Radeon HD 4850 2GB

Intro

Compare those specifications to the Radeon HD 4850 2GB, which has clock speeds of 625 MHz on the GPU, and 993 MHz on the 2048 MB of GDDR4 memory. It features 800(160x5) SPUs as well as 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 450 (OEM)		106 Watts
Radeon HD 4850 2GB		110 Watts
	Difference: 4 Watts (4%)

Memory Bandwidth

As far as performance goes, the GeForce GT 450 (OEM) should in theory be quite a bit better than the Radeon HD 4850 2GB overall. (explain)

GeForce GT 450 (OEM)		96000 MB/sec
Radeon HD 4850 2GB		63552 MB/sec
	Difference: 32448 (51%)

Texel Rate

The Radeon HD 4850 2GB is quite a bit (more or less 32%) more effective at texture filtering than the GeForce GT 450 (OEM). (explain)

Radeon HD 4850 2GB		25000 Mtexels/sec
GeForce GT 450 (OEM)		18960 Mtexels/sec
	Difference: 6040 (32%)

Pixel Rate

If using lots of anti-aliasing 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 4850 2GB		10000 Mpixels/sec
	Difference: 8960 (90%)

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 information (in units of megabytes per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip 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 card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.