Radeon HD 4890 1GB vs Radeon R7 370 4G

Intro

Compare that to the Radeon R7 370 4G, which makes use of a 28 nm design. AMD has set the core speed at 975 MHz. The GDDR5 RAM runs at a speed of 1400 MHz on this particular card. It features 1024 SPUs along with 64 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 370 4G		110 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 80 Watts (73%)

Memory Bandwidth

As far as performance goes, the Radeon R7 370 4G should theoretically be quite a bit better than the Radeon HD 4890 1GB in general. (explain)

Radeon R7 370 4G		179200 MB/sec
Radeon HD 4890 1GB		124800 MB/sec
	Difference: 54400 (44%)

Texel Rate

The Radeon R7 370 4G is a lot (about 56%) more effective at AF than the Radeon HD 4890 1GB. (explain)

Radeon R7 370 4G		62400 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 22400 (56%)

Pixel Rate

The Radeon R7 370 4G is much (approximately 95%) better at anti-aliasing than the Radeon HD 4890 1GB, and also will be able to handle higher resolutions without losing too much performance. (explain)

Radeon R7 370 4G		31200 Mpixels/sec
Radeon HD 4890 1GB		16000 Mpixels/sec
	Difference: 15200 (95%)

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 MB per second) that can be moved past the external memory interface within a second. The number is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better 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 amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video 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 amount of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated 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 fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.