GeForce GT 450 (OEM) vs Radeon HD 4870 X2

Intro

Compare those specifications to the Radeon HD 4870 X2, which makes use of a 55 nm design. AMD has set the core frequency at 750 MHz. The GDDR5 memory is set to run at a speed of 900 MHz on this card. 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 X2		350 Watts
	Difference: 244 Watts (230%)

Memory Bandwidth

In theory, the Radeon HD 4870 X2 will be 140% quicker than the GeForce GT 450 (OEM) in general, due to its higher data rate. (explain)

Radeon HD 4870 X2		230400 MB/sec
GeForce GT 450 (OEM)		96000 MB/sec
	Difference: 134400 (140%)

Texel Rate

The Radeon HD 4870 X2 is much (approximately 216%) better at texture filtering than the GeForce GT 450 (OEM). (explain)

Radeon HD 4870 X2		60000 Mtexels/sec
GeForce GT 450 (OEM)		18960 Mtexels/sec
	Difference: 41040 (216%)

Pixel Rate

The Radeon HD 4870 X2 is a lot (about 27%) better at FSAA than the GeForce GT 450 (OEM), and also will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 4870 X2		24000 Mpixels/sec
GeForce GT 450 (OEM)		18960 Mpixels/sec
	Difference: 5040 (27%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

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

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core clock speed. 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 rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.