GeForce GT 220 GDDR3 vs Radeon HD 7850

Intro

Compare those specifications to the Radeon HD 7850, which comes with a GPU core clock speed of 860 MHz, and 2048 MB of GDDR5 RAM running at 1200 MHz through a 256-bit bus. It also is comprised of 1024 SPUs, 64 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 220 GDDR3		58 Watts
Radeon HD 7850		130 Watts
	Difference: 72 Watts (124%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7850 should be 374% quicker than the GeForce GT 220 GDDR3 overall, due to its greater data rate. (explain)

Radeon HD 7850		153600 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 121216 (374%)

Texel Rate

The Radeon HD 7850 will be a lot (approximately 450%) better at AF than the GeForce GT 220 GDDR3. (explain)

Radeon HD 7850		55040 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 45040 (450%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 7850 is superior to the GeForce GT 220 GDDR3, and very much so. (explain)

Radeon HD 7850		27520 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 22520 (450%)

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: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This number is worked out 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 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 maximum amount of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.