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Radeon HD 4650 1GB vs Radeon HD 7750

Intro

The Radeon HD 4650 1GB uses a 55 nm design. ATi has clocked the core speed at 600 MHz. The GDDR3 memory is set to run at a frequency of 700 MHz on this specific model. It features 320(64x5) SPUs along with 32 TAUs and 8 Rasterization Operator Units.

Compare that to the Radeon HD 7750, which comes with core speeds of 800 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 memory. It features 512 SPUs along with 32 TAUs and 16 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

In theory, the Radeon HD 7750 will be 221% faster than the Radeon HD 4650 1GB overall, because of its higher bandwidth. (explain)

Radeon HD 7750 72000 MB/sec
Radeon HD 4650 1GB 22400 MB/sec
Difference: 49600 (221%)

Texel Rate

The Radeon HD 7750 will be much (about 33%) better at anisotropic filtering than the Radeon HD 4650 1GB. (explain)

Radeon HD 7750 25600 Mtexels/sec
Radeon HD 4650 1GB 19200 Mtexels/sec
Difference: 6400 (33%)

Pixel Rate

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

Radeon HD 7750 12800 Mpixels/sec
Radeon HD 4650 1GB 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

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

Radeon HD 4650 1GB

Amazon.com

Other US-based stores

Radeon HD 7750

Amazon.com

Other US-based stores

Specifications

Model Radeon HD 4650 1GB Radeon HD 7750
Manufacturer ATi ATi
Year Sep 10, 2008 February 2012
Code Name RV730 PRO Cape Verde Pro
Fab Process 55 nm 28 nm
Bus PCIe 2.0 x16, AGP 8x PCIe 3.0 x16
Memory 1024 MB 1024 MB
Core Speed 600 MHz 800 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 700 MHz (1400 MHz effective) 1125 MHz (4500 MHz effective)
Unified Shaders 320(64x5) 512
Texture Mapping Units 32 32
Render Output Units 8 16
Bus Type GDDR3 GDDR5
Bus Width 128-bit 128-bit
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2
Power (Max TDP) 55 watts 55 watts
Shader Model 4.1 5.0
Bandwidth 22400 MB/sec 72000 MB/sec
Texel Rate 19200 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 4800 Mpixels/sec 12800 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed 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 per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs 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 also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

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