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GeForce GTX 275 vs Radeon HD 4790

Intro

The GeForce GTX 275 comes with a GPU core 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 ROPs.

Compare those specs to the Radeon HD 4790, which comes with a clock speed of 600 MHz and a GDDR5 memory speed of 800 MHz. It also features a 256-bit bus, and makes use of a 55 nm design. It features 640(128x5) SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GTX 275 will be 24% quicker than the Radeon HD 4790 overall, due to its greater data rate. (explain)

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

Texel Rate

The GeForce GTX 275 should be quite a bit (more or less 164%) faster with regards to AF than the Radeon HD 4790. (explain)

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

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 275 is the winner, and very much so. (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 largest amount of data (in units of MB per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, the result 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 AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core 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 lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max 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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