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Radeon HD 4850 1GB vs Radeon HD 7750

Intro

The Radeon HD 4850 1GB comes with a clock speed of 625 MHz and a GDDR4 memory frequency of 993 MHz. It also makes use of a 256-bit memory bus, and makes use of a 55 nm design. It is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

Compare those specifications to the Radeon HD 7750, which has 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 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750 55 Watts
Radeon HD 4850 1GB 110 Watts
Difference: 55 Watts (100%)

Memory Bandwidth

In theory, the Radeon HD 7750 will be 13% faster than the Radeon HD 4850 1GB in general, due to its greater bandwidth. (explain)

Radeon HD 7750 72000 MB/sec
Radeon HD 4850 1GB 63552 MB/sec
Difference: 8448 (13%)

Texel Rate

The Radeon HD 7750 should be a little bit (about 2%) more effective at anisotropic filtering than the Radeon HD 4850 1GB. (explain)

Radeon HD 7750 25600 Mtexels/sec
Radeon HD 4850 1GB 25000 Mtexels/sec
Difference: 600 (2%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7750 is a better choice, by a large margin. (explain)

Radeon HD 7750 12800 Mpixels/sec
Radeon HD 4850 1GB 10000 Mpixels/sec
Difference: 2800 (28%)

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 HD 7750

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 HD 7750
Manufacturer AMD AMD
Year Jun 25, 2008 February 2012
Code Name RV770 PRO Cape Verde Pro
Memory 1024 MB 1024 MB
Core Speed 625 MHz 800 MHz
Memory Speed 1986 MHz 4500 MHz
Power (Max TDP) 110 watts 55 watts
Bandwidth 63552 MB/sec 72000 MB/sec
Texel Rate 25000 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 10000 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 800(160x5) 512
Texture Mapping Units 40 32
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 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total number of texture units by the core clock 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 amount of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines 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 output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 4850 1GB

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.

Comments

One Response to “Radeon HD 4850 1GB vs Radeon HD 7750”
vik says:

Radeon HD 7750, which features a clock frequency of 800 MHz and a GDDR5 memory frequency of 1125 MHz
and GDDR3 memory frequency of 800 MHz !!!!!
Sapphire PCI-Ex Radeon HD7750 2048MB GDDR3 (128bit) (800/1600) (VGA, DVI, HDMI)

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