GeForce GTX 965M vs Radeon HD 4870 2GB

Intro

Compare all of that to the Radeon HD 4870 2GB, which has clock speeds of 750 MHz on the GPU, and 900 MHz on the 2048 MB of GDDR5 memory. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 965M		60 Watts
Radeon HD 4870 2GB		150 Watts
	Difference: 90 Watts (150%)

Memory Bandwidth

The Radeon HD 4870 2GB should in theory be a lot faster than the GeForce GTX 965M overall. (explain)

Radeon HD 4870 2GB		115200 MB/sec
GeForce GTX 965M		64000 MB/sec
	Difference: 51200 (80%)

Texel Rate

The GeForce GTX 965M will be much (approximately 101%) more effective at anisotropic filtering than the Radeon HD 4870 2GB. (explain)

GeForce GTX 965M		60416 Mtexels/sec
Radeon HD 4870 2GB		30000 Mtexels/sec
	Difference: 30416 (101%)

Pixel Rate

The GeForce GTX 965M should be much (approximately 152%) better at full screen anti-aliasing than the Radeon HD 4870 2GB, and should be able to handle higher screen resolutions more effectively. (explain)

GeForce GTX 965M		30208 Mpixels/sec
Radeon HD 4870 2GB		12000 Mpixels/sec
	Difference: 18208 (152%)

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 max amount of information (measured in megabytes per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 can be 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 card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

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