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GeForce GTX 275 vs Radeon HD 7750


Intro

The GeForce GTX 275 makes use of a 55 nm design. nVidia has clocked the core speed at 633 MHz. The GDDR3 memory runs at a frequency of 1134 MHz on this model. It features 240 SPUs along with 80 TAUs and 28 ROPs.

Compare those specifications to the Radeon HD 7750, which makes use of a 28 nm design. AMD has set the core speed at 800 MHz. The GDDR5 RAM is set to run at a speed of 1125 MHz on this specific card. It features 512 SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750 55 Watts
GeForce GTX 275 219 Watts
Difference: 164 Watts (298%)

Memory Bandwidth

The GeForce GTX 275 should theoretically be quite a bit faster than the Radeon HD 7750 overall. (explain)

GeForce GTX 275 127008 MB/sec
Radeon HD 7750 72000 MB/sec
Difference: 55008 (76%)

Texel Rate

The GeForce GTX 275 should be a lot (about 98%) better at texture filtering than the Radeon HD 7750. (explain)

GeForce GTX 275 50640 Mtexels/sec
Radeon HD 7750 25600 Mtexels/sec
Difference: 25040 (98%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 275 is superior to the Radeon HD 7750, and very much so. (explain)

GeForce GTX 275 17724 Mpixels/sec
Radeon HD 7750 12800 Mpixels/sec
Difference: 4924 (38%)

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

GeForce GTX 275

Radeon HD 7750

Specifications

Display Specifications

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Model GeForce GTX 275 Radeon HD 7750
Manufacturer nVidia AMD
Year April 9, 2009 February 2012
Code Name G200b Cape Verde Pro
Memory 896 MB 1024 MB
Core Speed 633 MHz 800 MHz
Memory Speed 2268 MHz 4500 MHz
Power (Max TDP) 219 watts 55 watts
Bandwidth 127008 MB/sec 72000 MB/sec
Texel Rate 50640 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 17724 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 240 512
Texture Mapping Units 80 32
Render Output Units 28 16
Bus Type GDDR3 GDDR5
Bus Width 448-bit 128-bit
Fab Process 55 nm 28 nm
Transistors 1400 million 1500 million
Bus PCIe x16 2.0 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.1 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in megabytes per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units 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 fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

GeForce GTX 275

Radeon HD 7750

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