Radeon HD 4850 X2 512MB vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which features core speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs along with 128 TAUs and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
Radeon HD 4850 X2 512MB		250 Watts
	Difference: 125 Watts (100%)

Memory Bandwidth

Theoretically, the Radeon R9 M390X should perform a lot faster than the Radeon HD 4850 X2 512MB in general. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon HD 4850 X2 512MB		127104 MB/sec
	Difference: 32896 (26%)

Texel Rate

The Radeon R9 M390X should be quite a bit (approximately 85%) better at AF than the Radeon HD 4850 X2 512MB. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon HD 4850 X2 512MB		50000 Mtexels/sec
	Difference: 42544 (85%)

Pixel Rate

The Radeon R9 M390X is a little bit (more or less 16%) more effective at AA than the Radeon HD 4850 X2 512MB, and will be capable of handling higher resolutions better. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon HD 4850 X2 512MB		20000 Mpixels/sec
	Difference: 3136 (16%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of data (measured in megabytes per second) that can be transferred across the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The better 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 most pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs 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 fill rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.