Radeon HD 4770 vs Radeon R9 280X

Intro

Compare those specifications to the Radeon R9 280X, which comes with a clock speed of 850 MHz and a GDDR5 memory frequency of 1500 MHz. It also uses a 384-bit memory bus, and makes use of a 28 nm design. It is comprised of 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
Radeon R9 280X		250 Watts
	Difference: 170 Watts (213%)

Memory Bandwidth

The Radeon R9 280X should theoretically be much faster than the Radeon HD 4770 overall. (explain)

Radeon R9 280X		288000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 236800 (463%)

Texel Rate

The Radeon R9 280X will be quite a bit (about 353%) better at AF than the Radeon HD 4770. (explain)

Radeon R9 280X		108800 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 84800 (353%)

Pixel Rate

The Radeon R9 280X will be much (approximately 127%) more effective at anti-aliasing than the Radeon HD 4770, and also will be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon R9 280X		27200 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 15200 (127%)

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 largest amount of data (in units of MB 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 its memory speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 number is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the graphics card will be at 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 card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.