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Radeon HD 4850 1GB vs Radeon R7 250

Intro

The Radeon HD 4850 1GB has a core clock frequency of 625 MHz and a GDDR4 memory frequency of 993 MHz. It also features a 256-bit memory bus, and uses a 55 nm design. It is made up of 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

Compare all that to the Radeon R7 250, which features GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 memory set to run at 1150 MHz through a 128-bit bus. It also is made up of 384 Stream Processors, 24 TAUs, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250 65 Watts
Radeon HD 4850 1GB 110 Watts
Difference: 45 Watts (69%)

Memory Bandwidth

The Radeon R7 250 should theoretically be a bit faster than the Radeon HD 4850 1GB overall. (explain)

Radeon R7 250 73600 MB/sec
Radeon HD 4850 1GB 63552 MB/sec
Difference: 10048 (16%)

Texel Rate

The Radeon HD 4850 1GB should be a bit (approximately 4%) faster with regards to texture filtering than the Radeon R7 250. (explain)

Radeon HD 4850 1GB 25000 Mtexels/sec
Radeon R7 250 24000 Mtexels/sec
Difference: 1000 (4%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 4850 1GB is a better choice, by a large margin. (explain)

Radeon HD 4850 1GB 10000 Mpixels/sec
Radeon R7 250 8000 Mpixels/sec
Difference: 2000 (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.

Price Comparison

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Radeon HD 4850 1GB

Amazon.com

Check prices at:

Radeon R7 250

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 1GB Radeon R7 250
Manufacturer AMD AMD
Year Jun 25, 2008 October 2013
Code Name RV770 PRO Oland XT
Memory 1024 MB 1024 MB
Core Speed 625 MHz 1000 MHz
Memory Speed 1986 MHz 4600 MHz
Power (Max TDP) 110 watts 65 watts
Bandwidth 63552 MB/sec 73600 MB/sec
Texel Rate 25000 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 10000 Mpixels/sec 8000 Mpixels/sec
Unified Shaders 800(160x5) 384
Texture Mapping Units 40 24
Render Output Units 16 8
Bus Type GDDR4 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 28 nm
Transistors 956 million 1040 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 max amount of data (measured in MB per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the bus width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster 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 applied per second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the 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 amount of pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4850 1GB

Amazon.com

Check prices at:

Radeon R7 250

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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