GeForce GTX 570 vs Radeon HD 4650 1GB

Intro

Compare all that to the Radeon HD 4650 1GB, which has a GPU core clock speed of 600 MHz, and 1024 MB of GDDR3 RAM set to run at 700 MHz through a 128-bit bus. It also is made up of 320(64x5) Stream Processors, 32 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
GeForce GTX 570		219 Watts
	Difference: 164 Watts (298%)

Memory Bandwidth

Performance-wise, the GeForce GTX 570 should theoretically be much superior to the Radeon HD 4650 1GB overall. (explain)

GeForce GTX 570		152000 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 129600 (579%)

Texel Rate

The GeForce GTX 570 is a lot (about 129%) better at AF than the Radeon HD 4650 1GB. (explain)

GeForce GTX 570		43920 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 24720 (129%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 570 is a better choice, by a large margin. (explain)

GeForce GTX 570		29280 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 24480 (510%)

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 transported past the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the 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 - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.