GeForce 920M vs Radeon HD 4650 1GB

Intro

Compare those specs to the Radeon HD 4650 1GB, which features core clock speeds of 600 MHz on the GPU, and 700 MHz on the 1024 MB of GDDR3 memory. It features 320(64x5) SPUs as well as 32 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 4650 1GB will be 56% faster than the GeForce 920M overall, due to its higher data rate. (explain)

Radeon HD 4650 1GB		22400 MB/sec
GeForce 920M		14400 MB/sec
	Difference: 8000 (56%)

Texel Rate

The GeForce 920M will be much (about 59%) faster with regards to AF than the Radeon HD 4650 1GB. (explain)

GeForce 920M		30528 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 11328 (59%)

Pixel Rate

The GeForce 920M will be a lot (about 59%) better at FSAA than the Radeon HD 4650 1GB, and also should be capable of handling higher resolutions without losing too much performance. (explain)

GeForce 920M		7632 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 2832 (59%)

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 information (in units of megabytes per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 once 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 anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.