GeForce GT 220 GDDR3 vs Radeon HD 7770

Intro

Compare those specs to the Radeon HD 7770, which uses a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 RAM runs at a speed of 1125 MHz on this specific model. It features 640 SPUs along with 40 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 7770		80 Watts
	Difference: 22 Watts (38%)

Memory Bandwidth

In theory, the Radeon HD 7770 is 122% quicker than the GeForce GT 220 GDDR3 overall, due to its higher bandwidth. (explain)

Radeon HD 7770		72000 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 39616 (122%)

Texel Rate

The Radeon HD 7770 is quite a bit (about 300%) more effective at AF than the GeForce GT 220 GDDR3. (explain)

Radeon HD 7770		40000 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 30000 (300%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 7770 is superior to the GeForce GT 220 GDDR3, by a large margin. (explain)

Radeon HD 7770		16000 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 11000 (220%)

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 information (measured in MB per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.