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

Intro

Compare those specifications to the Radeon HD 4850 X2 512MB, which comes with a core clock speed of 625 MHz and a GDDR3 memory speed of 993 MHz. It also features a 256-bit memory bus, and uses a 55 nm design. It is made up of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

Hide Graphs

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

The Radeon HD 4850 X2 512MB should in theory perform much faster than the GeForce GT 450 (OEM) in general. (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 quite a bit (about 164%) faster with regards to anisotropic filtering 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%) faster with regards to full screen anti-aliasing than the GeForce GT 450 (OEM), and should be able to handle higher screen resolutions without losing too much performance. (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: Bandwidth is the largest amount of information (measured in MB per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.