Radeon HD 5770 vs Radeon R9 390 8G

Intro

Compare all of that to the Radeon R9 390 8G, which comes with a clock speed of 1000 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 512-bit bus, and makes use of a 28 nm design. It features 2560 SPUs, 160 Texture Address Units, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770		108 Watts
Radeon R9 390 8G		275 Watts
	Difference: 167 Watts (155%)

Memory Bandwidth

As far as performance goes, the Radeon R9 390 8G should theoretically be much superior to the Radeon HD 5770 overall. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon HD 5770		76800 MB/sec
	Difference: 307200 (400%)

Texel Rate

The Radeon R9 390 8G is quite a bit (approximately 371%) more effective at AF than the Radeon HD 5770. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon HD 5770		34000 Mtexels/sec
	Difference: 126000 (371%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 390 8G is superior to the Radeon HD 5770, and very much so. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon HD 5770		13600 Mpixels/sec
	Difference: 50400 (371%)

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 megabytes per second) that can be transferred over 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 memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.