Radeon HD 4770 vs Radeon R9 M395X

Intro

Compare that to the Radeon R9 M395X, which makes use of a 28 nm design. AMD has clocked the core frequency at 723 MHz. The GDDR5 RAM is set to run at a speed of 1250 MHz on this specific card. It features 2048 SPUs as well as 128 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
Radeon R9 M395X		125 Watts
	Difference: 45 Watts (56%)

Memory Bandwidth

In theory, the Radeon R9 M395X is 213% quicker than the Radeon HD 4770 in general, because of its higher bandwidth. (explain)

Radeon R9 M395X		160000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 108800 (213%)

Texel Rate

The Radeon R9 M395X will be much (more or less 286%) better at AF than the Radeon HD 4770. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 68544 (286%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 M395X is the winner, by far. (explain)

Radeon R9 M395X		23136 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 11136 (93%)

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 (measured in MB per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. If it uses DDR memory, it should 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, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the card's 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 rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.