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Radeon HD 4650 512MB vs Radeon HD 7750

Intro

The Radeon HD 4650 512MB comes with core speeds of 600 MHz on the GPU, and 500 MHz on the 512 MB of DDR2 memory. It features 320(64x5) SPUs along with 32 Texture Address Units and 8 ROPs.

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

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Theoretically speaking, the Radeon HD 7750 will be 350% quicker than the Radeon HD 4650 512MB in general, because of its greater bandwidth. (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 a lot (approximately 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

If using lots of anti-aliasing is important to you, then the Radeon HD 7750 is a better choice, and very much so. (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

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 512MB

Amazon.com

Other US-based stores

Radeon HD 7750

Amazon.com

Other US-based stores

Specifications

Model Radeon HD 4650 512MB 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 512 MB 1024 MB
Core Speed 600 MHz 800 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 500 MHz (1000 MHz effective) 1125 MHz (4500 MHz effective)
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
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 16000 MB/sec 72000 MB/sec
Texel Rate 19200 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 4800 Mpixels/sec 12800 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in MB per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the 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 number of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total texture units 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 applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines 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 also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

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