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Radeon HD 4850 X2 1GB vs Radeon R7 250X

Intro

The Radeon HD 4850 X2 1GB comes with core speeds of 625 MHz on the GPU, and 993 MHz on the 1024 MB of GDDR3 RAM. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

Compare those specs to the Radeon R7 250X, which comes with core clock speeds of 1000 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 RAM. It features 640 SPUs as well as 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250X 95 Watts
Radeon HD 4850 X2 1GB 250 Watts
Difference: 155 Watts (163%)

Memory Bandwidth

Theoretically, the Radeon HD 4850 X2 1GB should be a lot faster than the Radeon R7 250X in general. (explain)

Radeon HD 4850 X2 1GB 127104 MB/sec
Radeon R7 250X 72000 MB/sec
Difference: 55104 (77%)

Texel Rate

The Radeon HD 4850 X2 1GB will be quite a bit (more or less 25%) faster with regards to texture filtering than the Radeon R7 250X. (explain)

Radeon HD 4850 X2 1GB 50000 Mtexels/sec
Radeon R7 250X 40000 Mtexels/sec
Difference: 10000 (25%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 4850 X2 1GB is a better choice, and very much so. (explain)

Radeon HD 4850 X2 1GB 20000 Mpixels/sec
Radeon R7 250X 16000 Mpixels/sec
Difference: 4000 (25%)

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 R7 250X

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 R7 250X
Manufacturer AMD AMD
Year Nov 7, 2008 February 2014
Code Name R700 Cape Verde XT
Memory 1024 MB (x2) 1024 MB
Core Speed 625 MHz (x2) 1000 MHz
Memory Speed 1986 MHz (x2) 4500 MHz
Power (Max TDP) 250 watts 95 watts
Bandwidth 127104 MB/sec 72000 MB/sec
Texel Rate 50000 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 20000 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 800(160x5) (x2) 640
Texture Mapping Units 40 (x2) 40
Render Output Units 16 (x2) 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 55 nm 28 nm
Transistors 956 million 1500 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: Bandwidth is the max amount of information (in units of MB per second) that can be transferred past the external memory interface within a second. It's worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 4850 X2 1GB

Amazon.com

Check prices at:

Radeon R7 250X

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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