GeForce GT 220 GDDR3 vs Radeon HD 4870 X2

Intro

Compare those specs to the Radeon HD 4870 X2, which has a core clock frequency of 750 MHz and a GDDR5 memory speed of 900 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It features 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 220 GDDR3		58 Watts
Radeon HD 4870 X2		350 Watts
	Difference: 292 Watts (503%)

Memory Bandwidth

Performance-wise, the Radeon HD 4870 X2 should in theory be quite a bit superior to the GeForce GT 220 GDDR3 overall. (explain)

Radeon HD 4870 X2		230400 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 198016 (611%)

Texel Rate

The Radeon HD 4870 X2 should be much (about 500%) faster with regards to AF than the GeForce GT 220 GDDR3. (explain)

Radeon HD 4870 X2		60000 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 50000 (500%)

Pixel Rate

The Radeon HD 4870 X2 will be quite a bit (more or less 380%) faster with regards to AA than the GeForce GT 220 GDDR3, and also capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 4870 X2		24000 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 19000 (380%)

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 past the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the 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 texture map elements (texels) that can be applied per second. This is worked out by multiplying the total texture units of the card by the core 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 applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.