GeForce GT 450 (OEM) vs Radeon HD 4850 X2 512MB

Intro

Compare those specs to the Radeon HD 4850 X2 512MB, which has GPU clock speed of 625 MHz, and 512 MB of GDDR3 memory set to run at 993 MHz through a 256-bit bus. It also is made up of 800(160x5) SPUs, 40 Texture Address Units, 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 X2 512MB		250 Watts
	Difference: 144 Watts (136%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 X2 512MB will be 32% quicker than the GeForce GT 450 (OEM) in general, due to its higher data rate. (explain)

Radeon HD 4850 X2 512MB		127104 MB/sec
GeForce GT 450 (OEM)		96000 MB/sec
	Difference: 31104 (32%)

Texel Rate

The Radeon HD 4850 X2 512MB is a lot (about 164%) more effective at AF than the GeForce GT 450 (OEM). (explain)

Radeon HD 4850 X2 512MB		50000 Mtexels/sec
GeForce GT 450 (OEM)		18960 Mtexels/sec
	Difference: 31040 (164%)

Pixel Rate

The Radeon HD 4850 X2 512MB will be a small bit (more or less 5%) better at FSAA than the GeForce GT 450 (OEM), and also should be able to handle higher resolutions more effectively. (explain)

Radeon HD 4850 X2 512MB		20000 Mpixels/sec
GeForce GT 450 (OEM)		18960 Mpixels/sec
	Difference: 1040 (5%)

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 data (measured in MB per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total amount of texture units by the core 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 processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.