Radeon HD 4870 1GB vs Radeon R9 M365X

Intro

Compare those specs to the Radeon R9 M365X, which features GPU core speed of 925 MHz, and 4096 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 4870 1GB should in theory perform a lot faster than the Radeon R9 M365X overall. (explain)

Radeon HD 4870 1GB		115200 MB/sec
Radeon R9 M365X		72000 MB/sec
	Difference: 43200 (60%)

Texel Rate

The Radeon R9 M365X is a lot (more or less 23%) faster with regards to AF than the Radeon HD 4870 1GB. (explain)

Radeon R9 M365X		37000 Mtexels/sec
Radeon HD 4870 1GB		30000 Mtexels/sec
	Difference: 7000 (23%)

Pixel Rate

The Radeon R9 M365X is much (approximately 23%) more effective at full screen anti-aliasing than the Radeon HD 4870 1GB, and also able to handle higher resolutions better. (explain)

Radeon R9 M365X		14800 Mpixels/sec
Radeon HD 4870 1GB		12000 Mpixels/sec
	Difference: 2800 (23%)

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 data (in units of megabytes per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card 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 clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.