Radeon HD 4770 vs Radeon R9 M380

Intro

Compare those specifications to the Radeon R9 M380, which makes use of a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 memory runs at a speed of 1500 MHz on this card. It features 640 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon R9 M380 should perform quite a bit faster than the Radeon HD 4770 overall. (explain)

Radeon R9 M380		96000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 44800 (88%)

Texel Rate

The Radeon R9 M380 should be quite a bit (more or less 67%) better at AF than the Radeon HD 4770. (explain)

Radeon R9 M380		40000 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 16000 (67%)

Pixel Rate

The Radeon R9 M380 will be a lot (more or less 33%) better at anti-aliasing than the Radeon HD 4770, and should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 M380		16000 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 4000 (33%)

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 past the external memory interface within a second. It is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs 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 is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.