GeForce GT 450 (OEM) vs Radeon HD 4870 1GB

Intro

Compare those specifications to the Radeon HD 4870 1GB, which makes use of a 55 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 memory runs at a frequency of 900 MHz on this particular model. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 450 (OEM)		106 Watts
Radeon HD 4870 1GB		150 Watts
	Difference: 44 Watts (42%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4870 1GB should in theory be a bit better than the GeForce GT 450 (OEM) in general. (explain)

Radeon HD 4870 1GB		115200 MB/sec
GeForce GT 450 (OEM)		96000 MB/sec
	Difference: 19200 (20%)

Texel Rate

The Radeon HD 4870 1GB should be a lot (about 58%) faster with regards to AF than the GeForce GT 450 (OEM). (explain)

Radeon HD 4870 1GB		30000 Mtexels/sec
GeForce GT 450 (OEM)		18960 Mtexels/sec
	Difference: 11040 (58%)

Pixel Rate

The GeForce GT 450 (OEM) is much (more or less 58%) better at full screen anti-aliasing than the Radeon HD 4870 1GB, and capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce GT 450 (OEM)		18960 Mpixels/sec
Radeon HD 4870 1GB		12000 Mpixels/sec
	Difference: 6960 (58%)

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 max amount of information (measured in megabytes per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, 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 can be applied in one second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core clock speed. 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, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.