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Radeon HD 4770 vs Radeon HD 7750

Intro

The Radeon HD 4770 has a GPU core speed of 750 MHz, and the 512 MB of GDDR5 RAM is set to run at 800 MHz through a 128-bit bus. It also is comprised of 640(128x5) Stream Processors, 32 Texture Address Units, and 16 Raster Operation Units.

Compare all of that to the Radeon HD 7750, which features a clock speed of 800 MHz and a GDDR5 memory speed of 1125 MHz. It also makes use of a 128-bit bus, and uses a 28 nm design. It is comprised of 512 SPUs, 32 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750 55 Watts
Radeon HD 4770 80 Watts
Difference: 25 Watts (45%)

Memory Bandwidth

The Radeon HD 7750 should theoretically perform a lot faster than the Radeon HD 4770 overall. (explain)

Radeon HD 7750 72000 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 20800 (41%)

Texel Rate

The Radeon HD 7750 is a bit (more or less 7%) faster with regards to AF than the Radeon HD 4770. (explain)

Radeon HD 7750 25600 Mtexels/sec
Radeon HD 4770 24000 Mtexels/sec
Difference: 1600 (7%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 7750 is the winner, but it probably won't make a huge difference. (explain)

Radeon HD 7750 12800 Mpixels/sec
Radeon HD 4770 12000 Mpixels/sec
Difference: 800 (7%)

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 4770

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 4770 Radeon HD 7750
Manufacturer AMD AMD
Year Apr 28, 2009 February 2012
Code Name RV740 Cape Verde Pro
Memory 512 MB 1024 MB
Core Speed 750 MHz 800 MHz
Memory Speed 3200 MHz 4500 MHz
Power (Max TDP) 80 watts 55 watts
Bandwidth 51200 MB/sec 72000 MB/sec
Texel Rate 24000 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 640(128x5) 512
Texture Mapping Units 32 32
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 826 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: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, 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 are processed in one second. This number is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 4770

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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