GeForce GTX 660 vs Radeon HD 4650 1GB

Intro

Compare all that to the Radeon HD 4650 1GB, which has core speeds of 600 MHz on the GPU, and 700 MHz on the 1024 MB of GDDR3 RAM. It features 320(64x5) SPUs along with 32 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
GeForce GTX 660		140 Watts
	Difference: 85 Watts (155%)

Memory Bandwidth

In theory, the GeForce GTX 660 should be quite a bit faster than the Radeon HD 4650 1GB overall. (explain)

GeForce GTX 660		144192 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 121792 (544%)

Texel Rate

The GeForce GTX 660 is a lot (about 308%) faster with regards to AF than the Radeon HD 4650 1GB. (explain)

GeForce GTX 660		78400 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 59200 (308%)

Pixel Rate

The GeForce GTX 660 will be much (approximately 390%) better at FSAA than the Radeon HD 4650 1GB, and will be capable of handling higher resolutions more effectively. (explain)

GeForce GTX 660		23520 Mpixels/sec
Radeon HD 4650 1GB		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 max amount of data (in units of MB per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the bus width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's 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 processed in one second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.