GeForce GTX 980M vs Radeon HD 4850 1GB

Intro

Compare those specs to the Radeon HD 4850 1GB, which features core clock speeds of 625 MHz on the GPU, and 993 MHz on the 1024 MB of GDDR4 RAM. 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 980M		100 Watts
Radeon HD 4850 1GB		110 Watts
	Difference: 10 Watts (10%)

Memory Bandwidth

In theory, the GeForce GTX 980M should be 101% quicker than the Radeon HD 4850 1GB overall, due to its higher data rate. (explain)

GeForce GTX 980M		128000 MB/sec
Radeon HD 4850 1GB		63552 MB/sec
	Difference: 64448 (101%)

Texel Rate

The GeForce GTX 980M will be a lot (more or less 299%) more effective at AF than the Radeon HD 4850 1GB. (explain)

GeForce GTX 980M		99648 Mtexels/sec
Radeon HD 4850 1GB		25000 Mtexels/sec
	Difference: 74648 (299%)

Pixel Rate

The GeForce GTX 980M will be a lot (more or less 564%) more effective at FSAA than the Radeon HD 4850 1GB, and also should be capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTX 980M		66432 Mpixels/sec
Radeon HD 4850 1GB		10000 Mpixels/sec
	Difference: 56432 (564%)

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 (in units of MB per second) that can be moved over the external memory interface in one second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total 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 in a second.

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