GeForce GT 220 GDDR3 vs Radeon HD 7850

Intro

Compare all that to the Radeon HD 7850, which comes with GPU core speed of 860 MHz, and 2048 MB of GDDR5 memory set to run at 1200 MHz through a 256-bit bus. It also features 1024 Stream Processors, 64 Texture Address Units, and 32 ROPs.

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

Performance-wise, the Radeon HD 7850 should in theory be a lot superior to the GeForce GT 220 GDDR3 overall. (explain)

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

Texel Rate

The Radeon HD 7850 should be a lot (approximately 450%) faster with regards to anisotropic filtering 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

The Radeon HD 7850 will be quite a bit (approximately 450%) more effective at full screen anti-aliasing than the GeForce GT 220 GDDR3, and capable of handling higher resolutions while still performing well. (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 largest amount of information (counted in MB per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR memory, 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, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel 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 potential to get to the maximum fill rate.