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GeForce GTX 295 vs Radeon HD 4890 2GB

Intro

The GeForce GTX 295 uses a 55 nm design. nVidia has set the core frequency at 576 MHz. The GDDR3 RAM is set to run at a frequency of 999 MHz on this particular model. It features 240 SPUs as well as 80 TAUs and 28 ROPs.

Compare that to the Radeon HD 4890 2GB, which features a clock speed of 1000 MHz and a GDDR5 memory speed of 975 MHz. It also makes use of a 256-bit memory bus, and makes use of a 55 nm design. It is comprised 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

Theoretically speaking, the GeForce GTX 295 should be a lot faster than the Radeon HD 4890 2GB overall. (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 (more or less 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 FSAA than the Radeon HD 4890 2GB, and will be capable of handling higher screen resolutions while still performing well. (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 maximum amount of information (measured in megabytes per second) that can be transferred over the external memory interface in one second. The number is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 can be applied per second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels 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 number is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka 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 ability 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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