GeForce GTX 660 vs Radeon HD 4650 512MB

Intro

Compare that to the Radeon HD 4650 512MB, which features a GPU core clock speed of 600 MHz, and 512 MB of DDR2 RAM set to run at 500 MHz through a 128-bit bus. It also features 320(64x5) Stream Processors, 32 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB		55 Watts
GeForce GTX 660		140 Watts
	Difference: 85 Watts (155%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 660 is 801% faster than the Radeon HD 4650 512MB overall, due to its greater data rate. (explain)

GeForce GTX 660		144192 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 128192 (801%)

Texel Rate

The GeForce GTX 660 should be quite a bit (approximately 308%) more effective at AF than the Radeon HD 4650 512MB. (explain)

GeForce GTX 660		78400 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 59200 (308%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 660 is superior to the Radeon HD 4650 512MB, by far. (explain)

GeForce GTX 660		23520 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 18720 (390%)

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 moved across the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster 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 texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total number of texture units of the card 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 in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.