GeForce GTX 870M vs Radeon HD 4650 1GB

Intro

Compare that to the Radeon HD 4650 1GB, which comes with clock speeds of 600 MHz on the GPU, and 700 MHz on the 1024 MB of GDDR3 memory. 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 870M		110 Watts
	Difference: 55 Watts (100%)

Memory Bandwidth

In theory, the GeForce GTX 870M should be much faster than the Radeon HD 4650 1GB in general. (explain)

GeForce GTX 870M		96000 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 73600 (329%)

Texel Rate

The GeForce GTX 870M should be a lot (approximately 449%) faster with regards to texture filtering than the Radeon HD 4650 1GB. (explain)

GeForce GTX 870M		105392 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 86192 (449%)

Pixel Rate

The GeForce GTX 870M is much (approximately 371%) faster with regards to FSAA than the Radeon HD 4650 1GB, and able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 870M		22584 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 17784 (371%)

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 (measured in megabytes per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the interface width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 number of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.