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Radeon HD 4850 X2 1GB vs Radeon R9 295X2

Intro

The Radeon HD 4850 X2 1GB makes use of a 55 nm design. AMD has clocked the core speed at 625 MHz. The GDDR3 RAM is set to run at a speed of 993 MHz on this card. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

Compare all of that to the Radeon R9 295X2, which features clock speeds of 1018 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 memory. It features 2816 SPUs along with 176 Texture Address Units and 64 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 X2 1GB 250 Watts
Radeon R9 295X2 500 Watts
Difference: 250 Watts (100%)

Memory Bandwidth

The Radeon R9 295X2, in theory, should be a lot faster than the Radeon HD 4850 X2 1GB in general. (explain)

Radeon R9 295X2 640000 MB/sec
Radeon HD 4850 X2 1GB 127104 MB/sec
Difference: 512896 (404%)

Texel Rate

The Radeon R9 295X2 is quite a bit (approximately 617%) more effective at anisotropic filtering than the Radeon HD 4850 X2 1GB. (explain)

Radeon R9 295X2 358336 Mtexels/sec
Radeon HD 4850 X2 1GB 50000 Mtexels/sec
Difference: 308336 (617%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 295X2 is the winner, and very much so. (explain)

Radeon R9 295X2 130304 Mpixels/sec
Radeon HD 4850 X2 1GB 20000 Mpixels/sec
Difference: 110304 (552%)

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

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Radeon HD 4850 X2 1GB

Amazon.com

Check prices at:

Radeon R9 295X2

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.

Specifications

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Model Radeon HD 4850 X2 1GB Radeon R9 295X2
Manufacturer AMD AMD
Year Nov 7, 2008 April 2014
Code Name R700 Vesuvius
Memory 1024 MB (x2) 4096 MB (x2)
Core Speed 625 MHz (x2) 1018 MHz (x2)
Memory Speed 1986 MHz (x2) 5000 MHz (x2)
Power (Max TDP) 250 watts 500 watts
Bandwidth 127104 MB/sec 640000 MB/sec
Texel Rate 50000 Mtexels/sec 358336 Mtexels/sec
Pixel Rate 20000 Mpixels/sec 130304 Mpixels/sec
Unified Shaders 800(160x5) (x2) 2816 (x2)
Texture Mapping Units 40 (x2) 176 (x2)
Render Output Units 16 (x2) 64 (x2)
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 512-bit (x2)
Fab Process 55 nm 28 nm
Transistors 956 million 6200 million
Bus PCIe 2.0 x16 (PCIe bridge) 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 (measured in MB per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high 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 better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

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

Display Prices

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Radeon HD 4850 X2 1GB

Amazon.com

Check prices at:

Radeon R9 295X2

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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