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

Intro

Compare all 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 memory. It features 2816 SPUs as well as 176 TAUs 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

Performance-wise, the Radeon R9 390X 8G should in theory be a lot better than the Radeon HD 4850 2GB in general. (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 will be much (more or less 639%) better at AF 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 using high levels of AA is important to you, then the Radeon R9 390X 8G is superior to the Radeon HD 4850 2GB, by a large margin. (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: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.