GeForce GTX 660 vs Radeon HD 3650 256MB

Intro

Compare those specifications to the Radeon HD 3650 256MB, which comes with clock speeds of 725 MHz on the GPU, and 800 MHz on the 256 MB of DDR2 memory. It features 120(24x5) SPUs along with 8 Texture Address Units and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650 256MB		78 Watts
GeForce GTX 660		140 Watts
	Difference: 62 Watts (79%)

Memory Bandwidth

In theory, the GeForce GTX 660 is 463% quicker than the Radeon HD 3650 256MB overall, because of its greater data rate. (explain)

GeForce GTX 660		144192 MB/sec
Radeon HD 3650 256MB		25600 MB/sec
	Difference: 118592 (463%)

Texel Rate

The GeForce GTX 660 should be quite a bit (about 1252%) more effective at AF than the Radeon HD 3650 256MB. (explain)

GeForce GTX 660		78400 Mtexels/sec
Radeon HD 3650 256MB		5800 Mtexels/sec
	Difference: 72600 (1252%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GTX 660 is a better choice, and very much so. (explain)

GeForce GTX 660		23520 Mpixels/sec
Radeon HD 3650 256MB		2900 Mpixels/sec
	Difference: 20620 (711%)

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 (measured in MB per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called 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, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.