GeForce 930M vs Radeon HD 4870 1GB

Intro

Compare all of that to the Radeon HD 4870 1GB, which uses a 55 nm design. AMD has set the core frequency at 750 MHz. The GDDR5 memory is set to run at a speed of 900 MHz on this specific model. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon HD 4870 1GB should perform quite a bit faster than the GeForce 930M overall. (explain)

Radeon HD 4870 1GB		115200 MB/sec
GeForce 930M		14400 MB/sec
	Difference: 100800 (700%)

Texel Rate

The Radeon HD 4870 1GB will be much (approximately 35%) more effective at texture filtering than the GeForce 930M. (explain)

Radeon HD 4870 1GB		30000 Mtexels/sec
GeForce 930M		22272 Mtexels/sec
	Difference: 7728 (35%)

Pixel Rate

The Radeon HD 4870 1GB is quite a bit (about 62%) faster with regards to AA than the GeForce 930M, and able to handle higher screen resolutions better. (explain)

Radeon HD 4870 1GB		12000 Mpixels/sec
GeForce 930M		7424 Mpixels/sec
	Difference: 4576 (62%)

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 information (in units of megabytes per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.