Radeon HD 4850 2GB vs Radeon R9 390X 8G

Intro

Compare all of that to the Radeon R9 390X 8G, which has core speeds of 1050 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 RAM. It features 2816 SPUs along with 176 Texture Address Units and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 2GB		110 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 165 Watts (150%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 390X 8G is 504% quicker than the Radeon HD 4850 2GB in general, due to its higher bandwidth. (explain)

Radeon R9 390X 8G		384000 MB/sec
Radeon HD 4850 2GB		63552 MB/sec
	Difference: 320448 (504%)

Texel Rate

The Radeon R9 390X 8G should be a lot (about 639%) better at texture filtering than the Radeon HD 4850 2GB. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon HD 4850 2GB		25000 Mtexels/sec
	Difference: 159800 (639%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 390X 8G is a better choice, by far. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon HD 4850 2GB		10000 Mpixels/sec
	Difference: 57200 (572%)

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 (counted in MB per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR 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 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 applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.