Radeon HD 4870 1GB vs Radeon R9 M370X

Intro

Compare that to the Radeon R9 M370X, which comes with a GPU core clock speed of 800 MHz, and 2048 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also is made up of 640 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon HD 4870 1GB should perform a lot faster than the Radeon R9 M370X overall. (explain)

Radeon HD 4870 1GB		115200 MB/sec
Radeon R9 M370X		72000 MB/sec
	Difference: 43200 (60%)

Texel Rate

The Radeon R9 M370X should be a small bit (approximately 7%) faster with regards to AF than the Radeon HD 4870 1GB. (explain)

Radeon R9 M370X		32000 Mtexels/sec
Radeon HD 4870 1GB		30000 Mtexels/sec
	Difference: 2000 (7%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 M370X is superior to the Radeon HD 4870 1GB, but it probably won't make a huge difference. (explain)

Radeon R9 M370X		12800 Mpixels/sec
Radeon HD 4870 1GB		12000 Mpixels/sec
	Difference: 800 (7%)

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 maximum amount of information (measured in MB per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better 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 can be processed in one second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock 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 is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.