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GeForce GTX 295 vs Radeon HD 4890 2GB

Intro

The GeForce GTX 295 has a GPU clock speed of 576 MHz, and the 896 MB of GDDR3 RAM is set to run at 999 MHz through a 448-bit bus. It also is comprised of 240 Stream Processors, 80 Texture Address Units, and 28 ROPs.

Compare all of that to the Radeon HD 4890 2GB, which features GPU core speed of 1000 MHz, and 2048 MB of GDDR5 memory set to run at 975 MHz through a 256-bit bus. It also is made up of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 2GB 190 Watts
GeForce GTX 295 289 Watts
Difference: 99 Watts (52%)

Memory Bandwidth

In theory, the GeForce GTX 295 is 79% faster than the Radeon HD 4890 2GB in general, because of its higher data rate. (explain)

GeForce GTX 295 223776 MB/sec
Radeon HD 4890 2GB 124800 MB/sec
Difference: 98976 (79%)

Texel Rate

The GeForce GTX 295 is quite a bit (about 130%) faster with regards to texture filtering than the Radeon HD 4890 2GB. (explain)

GeForce GTX 295 92160 Mtexels/sec
Radeon HD 4890 2GB 40000 Mtexels/sec
Difference: 52160 (130%)

Pixel Rate

The GeForce GTX 295 will be quite a bit (more or less 102%) more effective at AA than the Radeon HD 4890 2GB, and also able to handle higher screen resolutions more effectively. (explain)

GeForce GTX 295 32256 Mpixels/sec
Radeon HD 4890 2GB 16000 Mpixels/sec
Difference: 16256 (102%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce GTX 295

Amazon.com

Check prices at:

Radeon HD 4890 2GB

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 295 Radeon HD 4890 2GB
Manufacturer nVidia AMD
Year January 8, 2009 Apr 2, 2009
Code Name G200b RV790 XT
Memory 896 MB (x2) 2048 MB
Core Speed 576 MHz (x2) 1000 MHz
Memory Speed 1998 MHz (x2) 3900 MHz
Power (Max TDP) 289 watts 190 watts
Bandwidth 223776 MB/sec 124800 MB/sec
Texel Rate 92160 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 32256 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 240 (x2) 800(160x5)
Texture Mapping Units 80 (x2) 40
Render Output Units 28 (x2) 16
Bus Type GDDR3 GDDR5
Bus Width 448-bit (x2) 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 max amount of information (counted in megabytes per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, the result should 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 texture map elements (texels) that are processed per second. This number is worked out by multiplying the total amount of texture units 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 applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce GTX 295

Amazon.com

Check prices at:

Radeon HD 4890 2GB

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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