GeForce GTX 965M vs Radeon HD 4870 512MB

Intro

Compare that to the Radeon HD 4870 512MB, which makes use of a 55 nm design. AMD has clocked the core speed at 750 MHz. The GDDR5 RAM works at a speed of 900 MHz on this particular card. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 965M		60 Watts
Radeon HD 4870 512MB		150 Watts
	Difference: 90 Watts (150%)

Memory Bandwidth

In theory, the Radeon HD 4870 512MB should be 80% faster than the GeForce GTX 965M in general, due to its greater data rate. (explain)

Radeon HD 4870 512MB		115200 MB/sec
GeForce GTX 965M		64000 MB/sec
	Difference: 51200 (80%)

Texel Rate

The GeForce GTX 965M should be a lot (approximately 101%) faster with regards to texture filtering than the Radeon HD 4870 512MB. (explain)

GeForce GTX 965M		60416 Mtexels/sec
Radeon HD 4870 512MB		30000 Mtexels/sec
	Difference: 30416 (101%)

Pixel Rate

The GeForce GTX 965M will be quite a bit (more or less 152%) more effective at AA than the Radeon HD 4870 512MB, and should be able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 965M		30208 Mpixels/sec
Radeon HD 4870 512MB		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 largest amount of information (measured in MB per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher 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 number of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the video 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 that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.