Radeon HD 4850 1GB vs Radeon R9 M395X

Intro

Compare all that to the Radeon R9 M395X, which features a core clock speed of 723 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 256-bit memory bus, and uses 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 4850 1GB		110 Watts
Radeon R9 M395X		125 Watts
	Difference: 15 Watts (14%)

Memory Bandwidth

In theory, the Radeon R9 M395X is 152% quicker than the Radeon HD 4850 1GB overall, due to its greater data rate. (explain)

Radeon R9 M395X		160000 MB/sec
Radeon HD 4850 1GB		63552 MB/sec
	Difference: 96448 (152%)

Texel Rate

The Radeon R9 M395X should be quite a bit (about 270%) more effective at texture filtering than the Radeon HD 4850 1GB. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 4850 1GB		25000 Mtexels/sec
	Difference: 67544 (270%)

Pixel Rate

The Radeon R9 M395X is a lot (more or less 131%) faster with regards to full screen anti-aliasing than the Radeon HD 4850 1GB, and should be capable of handling higher screen resolutions better. (explain)

Radeon R9 M395X		23136 Mpixels/sec
Radeon HD 4850 1GB		10000 Mpixels/sec
	Difference: 13136 (131%)

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 maximum amount of information (counted in megabytes per second) that can be transported past the external memory interface in one second. The number is worked out by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core speed of the card. 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 also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.