GeForce GT 220 GDDR3 vs Radeon HD 4770

Intro

Compare those specs to the Radeon HD 4770, which has core clock speeds of 750 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 220 GDDR3		58 Watts
Radeon HD 4770		80 Watts
	Difference: 22 Watts (38%)

Memory Bandwidth

In theory, the Radeon HD 4770 will be 58% faster than the GeForce GT 220 GDDR3 in general, due to its greater bandwidth. (explain)

Radeon HD 4770		51200 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 18816 (58%)

Texel Rate

The Radeon HD 4770 is a lot (approximately 140%) better at anisotropic filtering than the GeForce GT 220 GDDR3. (explain)

Radeon HD 4770		24000 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 14000 (140%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 4770 is the winner, and very much so. (explain)

Radeon HD 4770		12000 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 7000 (140%)

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 max amount of data (in units of MB per second) that can be moved over the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If 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 figure is worked out by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at 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 that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called 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, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.