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Radeon HD 4870 2GB vs Radeon R9 M270X

Intro

The Radeon HD 4870 2GB has a GPU core speed of 750 MHz, and the 2048 MB of GDDR5 RAM runs at 900 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

Compare those specifications to the Radeon R9 M270X, which makes use of a 28 nm design. AMD has set the core frequency at 725 MHz. The GDDR5 memory is set to run at a speed of 1125 MHz on this card. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 4870 2GB should theoretically perform a lot faster than the Radeon R9 M270X in general. (explain)

Radeon HD 4870 2GB 115200 MB/sec
Radeon R9 M270X 72000 MB/sec
Difference: 43200 (60%)

Texel Rate

The Radeon HD 4870 2GB should be a little bit (more or less 3%) more effective at texture filtering than the Radeon R9 M270X. (explain)

Radeon HD 4870 2GB 30000 Mtexels/sec
Radeon R9 M270X 29000 Mtexels/sec
Difference: 1000 (3%)

Pixel Rate

The Radeon HD 4870 2GB is a little bit (approximately 3%) faster with regards to AA than the Radeon R9 M270X, and capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 4870 2GB 12000 Mpixels/sec
Radeon R9 M270X 11600 Mpixels/sec
Difference: 400 (3%)

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

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Radeon HD 4870 2GB

Amazon.com

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Radeon R9 M270X

Amazon.com

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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 4870 2GB Radeon R9 M270X
Manufacturer AMD AMD
Year Jun 25, 2008 May 1 2014
Code Name RV770 XT Venus XT
Memory 2048 MB 2048 MB
Core Speed 750 MHz 725 MHz
Memory Speed 3600 MHz 4500 MHz
Power (Max TDP) 150 watts (Unknown) watts
Bandwidth 115200 MB/sec 72000 MB/sec
Texel Rate 30000 Mtexels/sec 29000 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 11600 Mpixels/sec
Unified Shaders 800(160x5) 640
Texture Mapping Units 40 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 28 nm
Transistors 956 million (Unknown) million
Bus PCIe 2.0 x16 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.2
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of data (in units of megabytes per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total number of texture units by the core clock 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 processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 4870 2GB

Amazon.com

Check prices at:

Radeon R9 M270X

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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