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Radeon HD 4650 1GB vs Radeon HD 7750


Intro

The Radeon HD 4650 1GB features core speeds of 600 MHz on the GPU, and 700 MHz on the 1024 MB of GDDR3 memory. It features 320(64x5) SPUs as well as 32 TAUs and 8 Rasterization Operator Units.

Compare all that to the Radeon HD 7750, which features a GPU core clock speed of 800 MHz, and 1024 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also is comprised of 512 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Theoretically speaking, the Radeon HD 7750 should be 221% quicker than the Radeon HD 4650 1GB in general, because of its greater data rate. (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 quite a bit (about 33%) better at AF 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

The Radeon HD 7750 is quite a bit (about 167%) faster with regards to full screen anti-aliasing than the Radeon HD 4650 1GB, and will be capable of handling higher resolutions more effectively. (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

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Radeon HD 4650 1GB

Amazon.com

Radeon HD 7750

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

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Model Radeon HD 4650 1GB Radeon HD 7750
Manufacturer AMD AMD
Year Sep 10, 2008 February 2012
Code Name RV730 PRO Cape Verde Pro
Memory 1024 MB 1024 MB
Core Speed 600 MHz 800 MHz
Memory Speed 1400 MHz 4500 MHz
Power (Max TDP) 55 watts 55 watts
Bandwidth 22400 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 GDDR3 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 max amount of information (in units of MB per second) that can be transported past the external memory interface within a second. The number is calculated by multiplying the interface width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video 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 that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4650 1GB

Amazon.com

Radeon HD 7750

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.

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