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Radeon HD 4850 1GB vs Radeon R7 250X 2GB

Intro

The Radeon HD 4850 1GB makes use of a 55 nm design. AMD has clocked the core frequency at 625 MHz. The GDDR4 memory is set to run at a speed of 993 MHz on this particular model. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Compare that to the Radeon R7 250X 2GB, which uses a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 memory works at a speed of 1125 MHz on this model. It features 640 SPUs as well as 40 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250X 2GB 95 Watts
Radeon HD 4850 1GB 110 Watts
Difference: 15 Watts (16%)

Memory Bandwidth

Theoretically speaking, the Radeon R7 250X 2GB should be 13% quicker than the Radeon HD 4850 1GB overall, because of its greater bandwidth. (explain)

Radeon R7 250X 2GB 72000 MB/sec
Radeon HD 4850 1GB 63552 MB/sec
Difference: 8448 (13%)

Texel Rate

The Radeon R7 250X 2GB should be much (more or less 60%) better at anisotropic filtering than the Radeon HD 4850 1GB. (explain)

Radeon R7 250X 2GB 40000 Mtexels/sec
Radeon HD 4850 1GB 25000 Mtexels/sec
Difference: 15000 (60%)

Pixel Rate

The Radeon R7 250X 2GB should be a lot (approximately 60%) faster with regards to FSAA than the Radeon HD 4850 1GB, and should be capable of handling higher screen resolutions better. (explain)

Radeon R7 250X 2GB 16000 Mpixels/sec
Radeon HD 4850 1GB 10000 Mpixels/sec
Difference: 6000 (60%)

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 4850 1GB

Amazon.com

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Radeon R7 250X 2GB

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 4850 1GB Radeon R7 250X 2GB
Manufacturer AMD AMD
Year Jun 25, 2008 February 2014
Code Name RV770 PRO Cape Verde XT
Memory 1024 MB 2048 MB
Core Speed 625 MHz 1000 MHz
Memory Speed 1986 MHz 4500 MHz
Power (Max TDP) 110 watts 95 watts
Bandwidth 63552 MB/sec 72000 MB/sec
Texel Rate 25000 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 10000 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 800(160x5) 640
Texture Mapping Units 40 40
Render Output Units 16 16
Bus Type GDDR4 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 28 nm
Transistors 956 million 1500 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: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be moved across the external memory interface in a second. The number is worked out by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 number of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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Radeon HD 4850 1GB

Amazon.com

Check prices at:

Radeon R7 250X 2GB

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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