GeForce 930M vs Radeon HD 4890 2GB

Intro

Compare all of that to the Radeon HD 4890 2GB, which uses a 55 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 RAM runs at a frequency of 975 MHz on this specific card. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 4890 2GB should be 767% quicker than the GeForce 930M in general, because of its higher bandwidth. (explain)

Radeon HD 4890 2GB		124800 MB/sec
GeForce 930M		14400 MB/sec
	Difference: 110400 (767%)

Texel Rate

The Radeon HD 4890 2GB will be a lot (more or less 80%) more effective at anisotropic filtering than the GeForce 930M. (explain)

Radeon HD 4890 2GB		40000 Mtexels/sec
GeForce 930M		22272 Mtexels/sec
	Difference: 17728 (80%)

Pixel Rate

The Radeon HD 4890 2GB will be a lot (approximately 116%) more effective at full screen anti-aliasing than the GeForce 930M, and should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 4890 2GB		16000 Mpixels/sec
GeForce 930M		7424 Mpixels/sec
	Difference: 8576 (116%)

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 MB per second) that can be moved past the external memory interface in a second. The number is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.