GeForce GTX 970M vs Radeon HD 4870 1GB

Intro

Compare those specifications to the Radeon HD 4870 1GB, which comes with core speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 970M		75 Watts
Radeon HD 4870 1GB		150 Watts
	Difference: 75 Watts (100%)

Memory Bandwidth

The Radeon HD 4870 1GB should theoretically be a small bit faster than the GeForce GTX 970M overall. (explain)

Radeon HD 4870 1GB		115200 MB/sec
GeForce GTX 970M		96000 MB/sec
	Difference: 19200 (20%)

Texel Rate

The GeForce GTX 970M should be much (approximately 146%) faster with regards to anisotropic filtering than the Radeon HD 4870 1GB. (explain)

GeForce GTX 970M		73920 Mtexels/sec
Radeon HD 4870 1GB		30000 Mtexels/sec
	Difference: 43920 (146%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTX 970M is superior to the Radeon HD 4870 1GB, by a large margin. (explain)

GeForce GTX 970M		44352 Mpixels/sec
Radeon HD 4870 1GB		12000 Mpixels/sec
	Difference: 32352 (270%)

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 largest amount of data (measured in megabytes per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's 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 texture map elements (texels) that are processed per second. This number is calculated by multiplying the total amount of texture units by the core clock 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 processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.