GeForce GTX 850M vs Radeon HD 4650 1GB

Intro

Compare all of that to the Radeon HD 4650 1GB, which features GPU 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) SPUs, 32 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
Radeon HD 4650 1GB		55 Watts
	Difference: 15 Watts (38%)

Memory Bandwidth

In theory, the GeForce GTX 850M should be a lot faster than the Radeon HD 4650 1GB overall. (explain)

GeForce GTX 850M		32000 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 9600 (43%)

Texel Rate

The GeForce GTX 850M is a lot (more or less 83%) faster with regards to anisotropic filtering than the Radeon HD 4650 1GB. (explain)

GeForce GTX 850M		35040 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 15840 (83%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 850M is superior to the Radeon HD 4650 1GB, by a large margin. (explain)

GeForce GTX 850M		14016 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 9216 (192%)

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 maximum amount of data (in units of megabytes per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high 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 clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most 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 amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.