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Radeon HD 4850 X2 512MB vs Radeon HD 7750

Intro

The Radeon HD 4850 X2 512MB has a core clock frequency of 625 MHz and a GDDR3 memory speed of 993 MHz. It also uses a 256-bit bus, and makes use of a 55 nm design. It is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 7750, which comes with GPU clock speed of 800 MHz, and 1024 MB of GDDR5 memory running at 1125 MHz through a 128-bit bus. It also is comprised of 512 Stream Processors, 32 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750 55 Watts
Radeon HD 4850 X2 512MB 250 Watts
Difference: 195 Watts (355%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 X2 512MB should perform quite a bit faster than the Radeon HD 7750 in general. (explain)

Radeon HD 4850 X2 512MB 127104 MB/sec
Radeon HD 7750 72000 MB/sec
Difference: 55104 (77%)

Texel Rate

The Radeon HD 4850 X2 512MB will be quite a bit (more or less 95%) better at AF than the Radeon HD 7750. (explain)

Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Radeon HD 7750 25600 Mtexels/sec
Difference: 24400 (95%)

Pixel Rate

The Radeon HD 4850 X2 512MB will be a lot (about 56%) more effective at anti-aliasing than the Radeon HD 7750, and also will be capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 4850 X2 512MB 20000 Mpixels/sec
Radeon HD 7750 12800 Mpixels/sec
Difference: 7200 (56%)

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 512MB

Amazon.com

Check prices at:

Radeon HD 7750

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 512MB Radeon HD 7750
Manufacturer AMD AMD
Year Nov 7, 2008 February 2012
Code Name R700 Cape Verde Pro
Memory 512 MB (x2) 1024 MB
Core Speed 625 MHz (x2) 800 MHz
Memory Speed 1986 MHz (x2) 4500 MHz
Power (Max TDP) 250 watts 55 watts
Bandwidth 127104 MB/sec 72000 MB/sec
Texel Rate 50000 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 20000 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 800(160x5) (x2) 512
Texture Mapping Units 40 (x2) 32
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 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Bandwidth is the largest amount of information (counted in megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the bus width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the video 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 the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 4850 X2 512MB

Amazon.com

Check prices at:

Radeon HD 7750

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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