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Radeon HD 7750 vs Radeon HD 7850

Intro

The Radeon HD 7750 uses a 28 nm design. AMD has clocked the core speed at 800 MHz. The GDDR5 RAM works at a speed of 1125 MHz on this particular card. It features 512 SPUs along with 32 Texture Address Units and 16 ROPs.

Compare those specifications to the Radeon HD 7850, which features GPU core speed of 860 MHz, and 2048 MB of GDDR5 memory running at 1200 MHz through a 256-bit bus. It also is made up of 1024 SPUs, 64 Texture Address Units, and 32 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750 55 Watts
Radeon HD 7850 130 Watts
Difference: 75 Watts (136%)

Memory Bandwidth

Theoretically, the Radeon HD 7850 should perform a lot faster than the Radeon HD 7750 overall. (explain)

Radeon HD 7850 153600 MB/sec
Radeon HD 7750 72000 MB/sec
Difference: 81600 (113%)

Texel Rate

The Radeon HD 7850 will be a lot (more or less 115%) more effective at anisotropic filtering than the Radeon HD 7750. (explain)

Radeon HD 7850 55040 Mtexels/sec
Radeon HD 7750 25600 Mtexels/sec
Difference: 29440 (115%)

Pixel Rate

The Radeon HD 7850 should be quite a bit (more or less 115%) faster with regards to AA than the Radeon HD 7750, and also able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 7850 27520 Mpixels/sec
Radeon HD 7750 12800 Mpixels/sec
Difference: 14720 (115%)

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

Radeon HD 7750

Amazon.com

Radeon HD 7850

Amazon.com

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

Model Radeon HD 7750 Radeon HD 7850
Manufacturer AMD AMD
Year February 2012 March 2012
Code Name Cape Verde Pro Pitcairn Pro
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 1024 MB 2048 MB
Core Speed 800 MHz 860 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1125 MHz (4500 MHz effective) 1200 MHz (4800 MHz effective)
Unified Shaders 512 1024
Texture Mapping Units 32 64
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2
Power (Max TDP) 55 watts 130 watts
Shader Model 5.0 5.0
Bandwidth 72000 MB/sec 153600 MB/sec
Texel Rate 25600 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 12800 Mpixels/sec 27520 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in MB per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the 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 amount of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

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