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GeForce GTX 275 vs Radeon HD 4790

Intro

The GeForce GTX 275 has a GPU clock speed of 633 MHz, and the 896 MB of GDDR3 RAM is set to run at 1134 MHz through a 448-bit bus. It also is comprised of 240 Stream Processors, 80 Texture Address Units, and 28 Raster Operation Units.

Compare all that to the Radeon HD 4790, which features GPU clock speed of 600 MHz, and 512 MB of GDDR5 RAM running at 800 MHz through a 256-bit bus. It also is comprised of 640(128x5) Stream Processors, 32 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the GeForce GTX 275 should perform a lot faster than the Radeon HD 4790 overall. (explain)

GeForce GTX 275 127008 MB/sec
Radeon HD 4790 102400 MB/sec
Difference: 24608 (24%)

Texel Rate

The GeForce GTX 275 will be quite a bit (approximately 164%) faster with regards to texture filtering than the Radeon HD 4790. (explain)

GeForce GTX 275 50640 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 31440 (164%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 275 is the winner, by far. (explain)

GeForce GTX 275 17724 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 8124 (85%)

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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GeForce GTX 275

Amazon.com

Check prices at:

Radeon HD 4790

Amazon.com

Check prices at:

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 GeForce GTX 275 Radeon HD 4790
Manufacturer nVidia AMD
Year April 9, 2009 2009
Code Name G200b RV790
Memory 896 MB 512 MB
Core Speed 633 MHz 600 MHz
Memory Speed 2268 MHz 3200 MHz
Power (Max TDP) 219 watts (Unknown) watts
Bandwidth 127008 MB/sec 102400 MB/sec
Texel Rate 50640 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 17724 Mpixels/sec 9600 Mpixels/sec
Unified Shaders 240 640(128x5)
Texture Mapping Units 80 32
Render Output Units 28 16
Bus Type GDDR3 GDDR5
Bus Width 448-bit 256-bit
Fab Process 55 nm 55 nm
Transistors 1400 million 959 million
Bus PCIe x16 2.0 PCIe 2.0 x16
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.1 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better 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 texture map elements (texels) that can be processed per second. This is calculated by multiplying the total texture units of the card 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 processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number 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 rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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GeForce GTX 275

Amazon.com

Check prices at:

Radeon HD 4790

Amazon.com

Check prices at:

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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