Radeon HD 4770 vs Radeon R9 M280X

Intro

Compare those specs to the Radeon R9 M280X, which features a clock frequency of 900 MHz and a GDDR5 memory frequency of 1375 MHz. It also uses a 128-bit bus, and makes use of a 28 nm design. It is comprised of 896 SPUs, 56 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M280X		75 Watts
Radeon HD 4770		80 Watts
	Difference: 5 Watts (7%)

Memory Bandwidth

As far as performance goes, the Radeon R9 M280X should theoretically be much better than the Radeon HD 4770 overall. (explain)

Radeon R9 M280X		88000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 36800 (72%)

Texel Rate

The Radeon R9 M280X should be quite a bit (approximately 110%) more effective at AF than the Radeon HD 4770. (explain)

Radeon R9 M280X		50400 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 26400 (110%)

Pixel Rate

The Radeon R9 M280X will be a small bit (more or less 20%) faster with regards to full screen anti-aliasing than the Radeon HD 4770, and should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 M280X		14400 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 2400 (20%)

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 maximum amount of information (counted in MB per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.