GeForce GTX 965M vs Radeon HD 4890 2GB

Intro

Compare all that to the Radeon HD 4890 2GB, which comes with GPU clock speed of 1000 MHz, and 2048 MB of GDDR5 RAM set to run at 975 MHz through a 256-bit bus. It also is comprised of 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

The Radeon HD 4890 2GB, in theory, should be much faster than the GeForce GTX 965M overall. (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 much (about 51%) more effective at 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

The GeForce GTX 965M will be quite a bit (more or less 89%) faster with regards to anti-aliasing than the Radeon HD 4890 2GB, and also will be capable of handling higher screen resolutions without losing too much performance. (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 (counted in megabytes per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the bus width by its memory clock 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 bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.