GeForce GTX 965M vs Radeon HD 4890 2GB

Intro

Compare all that to the Radeon HD 4890 2GB, which comes with a clock frequency of 1000 MHz and a GDDR5 memory frequency of 975 MHz. It also features a 256-bit bus, and makes use of a 55 nm design. It features 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 965M		60 Watts
Radeon HD 4890 2GB		190 Watts
	Difference: 130 Watts (217%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4890 2GB will be 95% faster than the GeForce GTX 965M in general, due to its higher data rate. (explain)

Radeon HD 4890 2GB		124800 MB/sec
GeForce GTX 965M		64000 MB/sec
	Difference: 60800 (95%)

Texel Rate

The GeForce GTX 965M should be a lot (approximately 51%) faster with regards to AF than the Radeon HD 4890 2GB. (explain)

GeForce GTX 965M		60416 Mtexels/sec
Radeon HD 4890 2GB		40000 Mtexels/sec
	Difference: 20416 (51%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GTX 965M is superior to the Radeon HD 4890 2GB, and very much so. (explain)

GeForce GTX 965M		30208 Mpixels/sec
Radeon HD 4890 2GB		16000 Mpixels/sec
	Difference: 14208 (89%)

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 (in units of megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core clock speed. 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 also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.