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Radeon HD 4650 512MB vs Radeon HD 7750


The Radeon HD 4650 512MB has a core clock frequency of 600 MHz and a DDR2 memory frequency of 500 MHz. It also makes use of a 128-bit memory bus, and uses a 55 nm design. It is made up of 320(64x5) SPUs, 32 TAUs, and 8 Raster Operation Units.

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

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

In theory, the Radeon HD 7750 should perform quite a bit faster than the Radeon HD 4650 512MB in general. (explain)

Radeon HD 7750 72000 MB/sec
Radeon HD 4650 512MB 16000 MB/sec
Difference: 56000 (350%)

Texel Rate

The Radeon HD 7750 should be much (about 33%) faster with regards to texture filtering than the Radeon HD 4650 512MB. (explain)

Radeon HD 7750 25600 Mtexels/sec
Radeon HD 4650 512MB 19200 Mtexels/sec
Difference: 6400 (33%)

Pixel Rate

The Radeon HD 7750 will be a lot (more or less 167%) better at full screen anti-aliasing than the Radeon HD 4650 512MB, and also should be capable of handling higher screen resolutions better. (explain)

Radeon HD 7750 12800 Mpixels/sec
Radeon HD 4650 512MB 4800 Mpixels/sec
Difference: 8000 (167%)

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 4650 512MB

Radeon HD 7750

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.


Display Specifications

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Model Radeon HD 4650 512MB Radeon HD 7750
Manufacturer AMD AMD
Year Sep 10, 2008 February 2012
Code Name RV730 PRO Cape Verde Pro
Memory 512 MB 1024 MB
Core Speed 600 MHz 800 MHz
Memory Speed 1000 MHz 4500 MHz
Power (Max TDP) 55 watts 55 watts
Bandwidth 16000 MB/sec 72000 MB/sec
Texel Rate 19200 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 4800 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 320(64x5) 512
Texture Mapping Units 32 32
Render Output Units 8 16
Bus Type DDR2 GDDR5
Bus Width 128-bit 128-bit
Fab Process 55 nm 28 nm
Transistors 514 million 1500 million
Bus PCIe 2.0 x16, AGP 8x 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 data (in units of megabytes per second) that can be transported across the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 once 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 anti-aliasing, HDR 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 of the card by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

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


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