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GeForce GTX 275 vs Radeon HD 7750

Intro

The GeForce GTX 275 comes with core speeds of 633 MHz on the GPU, and 1134 MHz on the 896 MB of GDDR3 RAM. It features 240 SPUs as well as 80 TAUs and 28 ROPs.

Compare all that to the Radeon HD 7750, which uses a 28 nm design. AMD has clocked the core speed at 800 MHz. The GDDR5 RAM works at a speed of 1125 MHz on this specific card. It features 512 SPUs along with 32 TAUs and 16 ROPs.

(No game benchmarks for this combination yet.)

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 in theory be quite a bit faster than the Radeon HD 7750 in general. (explain)

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

Texel Rate

The GeForce GTX 275 should be much (more or less 98%) more effective at anisotropic 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 using lots of anti-aliasing is important to you, then the GeForce GTX 275 is a better choice, by a large margin. (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

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

Model GeForce GTX 275 Radeon HD 7750
Manufacturer nVidia AMD
Year April 9, 2009 February 2012
Code Name G200b Cape Verde Pro
Fab Process 55 nm 28 nm
Bus PCIe x16 2.0 PCIe 3.0 x16
Memory 896 MB 1024 MB
Core Speed 633 MHz 800 MHz
Shader Speed 1404 MHz (N/A) MHz
Memory Speed 1134 MHz (2268 MHz effective) 1125 MHz (4500 MHz effective)
Unified Shaders 240 512
Texture Mapping Units 80 32
Render Output Units 28 16
Bus Type GDDR3 GDDR5
Bus Width 448-bit 128-bit
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.1 OpenGL 4.2
Power (Max TDP) 219 watts 55 watts
Shader Model 4.0 5.0
Bandwidth 127008 MB/sec 72000 MB/sec
Texel Rate 50640 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 17724 Mpixels/sec 12800 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

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