GeForce GTX 470 vs Radeon HD 4650 512MB

Intro

Compare those specifications to the Radeon HD 4650 512MB, which features GPU core speed of 600 MHz, and 512 MB of DDR2 RAM running at 500 MHz through a 128-bit bus. It also features 320(64x5) SPUs, 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 470		215 Watts
	Difference: 160 Watts (291%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 470 should theoretically be quite a bit better than the Radeon HD 4650 512MB in general. (explain)

GeForce GTX 470		133920 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 117920 (737%)

Texel Rate

The GeForce GTX 470 will be a lot (approximately 77%) faster with regards to anisotropic filtering than the Radeon HD 4650 512MB. (explain)

GeForce GTX 470		33992 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 14792 (77%)

Pixel Rate

The GeForce GTX 470 will be quite a bit (more or less 406%) better at anti-aliasing than the Radeon HD 4650 512MB, and also should be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 470		24280 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 19480 (406%)

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: Bandwidth is the largest amount of information (measured in megabytes per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the interface width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 amount of texture map elements (texels) that are applied per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that 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 Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.