GeForce GTX 550 Ti vs Radeon HD 4650 1GB

Intro

Compare those specifications to the Radeon HD 4650 1GB, which uses a 55 nm design. AMD has clocked the core speed at 600 MHz. The GDDR3 memory is set to run at a speed of 700 MHz on this model. 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 550 Ti		116 Watts
	Difference: 61 Watts (111%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 550 Ti is 340% faster than the Radeon HD 4650 1GB overall, because of its greater data rate. (explain)

GeForce GTX 550 Ti		98496 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 76096 (340%)

Texel Rate

The GeForce GTX 550 Ti is much (about 50%) faster with regards to anisotropic filtering than the Radeon HD 4650 1GB. (explain)

GeForce GTX 550 Ti		28800 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 9600 (50%)

Pixel Rate

The GeForce GTX 550 Ti is quite a bit (about 350%) more effective at full screen anti-aliasing than the Radeon HD 4650 1GB, and also should be capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce GTX 550 Ti		21600 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 16800 (350%)

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 megabytes per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 in one second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.