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

Intro

Compare those specs to the Radeon HD 4850 512MB, which uses a 55 nm design. AMD has clocked the core frequency at 625 MHz. The GDDR3 memory works at a speed of 993 MHz on this model. It features 800(160x5) SPUs as well as 40 TAUs 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 4850 512MB		110 Watts
	Difference: 4 Watts (4%)

Memory Bandwidth

In theory, the GeForce GT 450 (OEM) should be 51% faster than the Radeon HD 4850 512MB in general, because of its greater bandwidth. (explain)

GeForce GT 450 (OEM)		96000 MB/sec
Radeon HD 4850 512MB		63552 MB/sec
	Difference: 32448 (51%)

Texel Rate

The Radeon HD 4850 512MB will be a lot (approximately 32%) better at texture filtering than the GeForce GT 450 (OEM). (explain)

Radeon HD 4850 512MB		25000 Mtexels/sec
GeForce GT 450 (OEM)		18960 Mtexels/sec
	Difference: 6040 (32%)

Pixel Rate

The GeForce GT 450 (OEM) should be a lot (more or less 90%) faster with regards to FSAA than the Radeon HD 4850 512MB, and will be able to handle higher resolutions without slowing down too much. (explain)

GeForce GT 450 (OEM)		18960 Mpixels/sec
Radeon HD 4850 512MB		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: Bandwidth is the largest amount of information (in units of MB 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 clock speed. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better 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 in one second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.