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GeForce GTX 275 vs Radeon HD 7750

Intro

The GeForce GTX 275 has a GPU clock speed of 633 MHz, and the 896 MB of GDDR3 memory is set to run at 1134 MHz through a 448-bit bus. It also features 240 SPUs, 80 Texture Address Units, and 28 ROPs.

Compare those specs to the Radeon HD 7750, which features a clock speed of 800 MHz and a GDDR5 memory frequency of 1125 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It features 512 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

(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

Theoretically, the GeForce GTX 275 should be much 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 (more or less 98%) better at AF than the Radeon HD 7750. (explain)

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

Pixel Rate

The GeForce GTX 275 should be a lot (approximately 38%) faster with regards to FSAA than the Radeon HD 7750, and also will be capable of handling higher resolutions better. (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 maximum amount of data (measured in megabytes per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better 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 amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount 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 drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably 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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