GeForce GTX 660 vs Radeon HD 4650 1GB

Intro

Compare that to the Radeon HD 4650 1GB, which uses a 55 nm design. AMD has set the core frequency at 600 MHz. The GDDR3 memory works at a speed of 700 MHz on this particular model. It features 320(64x5) SPUs as well as 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

As far as performance goes, the GeForce GTX 660 should theoretically be quite a bit better 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 texture filtering 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

If using a high screen resolution 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 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 largest amount of data (in units of MB per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out 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 fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.