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GeForce GTX 295 vs Radeon HD 4850 X2 512MB

Intro

The GeForce GTX 295 comes with 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 made up of 240 Stream Processors, 80 Texture Address Units, and 28 ROPs.

Compare all of that to the Radeon HD 4850 X2 512MB, which has a core clock frequency of 625 MHz and a GDDR3 memory speed of 993 MHz. It also features a 256-bit memory bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 X2 512MB 250 Watts
GeForce GTX 295 289 Watts
Difference: 39 Watts (16%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 295 is 76% faster than the Radeon HD 4850 X2 512MB in general, because of its greater bandwidth. (explain)

GeForce GTX 295 223776 MB/sec
Radeon HD 4850 X2 512MB 127104 MB/sec
Difference: 96672 (76%)

Texel Rate

The GeForce GTX 295 is much (more or less 84%) better at texture filtering than the Radeon HD 4850 X2 512MB. (explain)

GeForce GTX 295 92160 Mtexels/sec
Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Difference: 42160 (84%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GTX 295 is a better choice, by far. (explain)

GeForce GTX 295 32256 Mpixels/sec
Radeon HD 4850 X2 512MB 20000 Mpixels/sec
Difference: 12256 (61%)

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 4850 X2 512MB

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 4850 X2 512MB
Manufacturer nVidia AMD
Year January 8, 2009 Nov 7, 2008
Code Name G200b R700
Memory 896 MB (x2) 512 MB (x2)
Core Speed 576 MHz (x2) 625 MHz (x2)
Memory Speed 1998 MHz (x2) 1986 MHz (x2)
Power (Max TDP) 289 watts 250 watts
Bandwidth 223776 MB/sec 127104 MB/sec
Texel Rate 92160 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 32256 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 240 (x2) 800(160x5) (x2)
Texture Mapping Units 80 (x2) 40 (x2)
Render Output Units 28 (x2) 16 (x2)
Bus Type GDDR3 GDDR3
Bus Width 448-bit (x2) 256-bit (x2)
Fab Process 55 nm 55 nm
Transistors 1400 million 956 million
Bus PCIe x16 2.0 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.1 OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of information (in units of MB per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total number 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 number of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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GeForce GTX 295

Amazon.com

Check prices at:

Radeon HD 4850 X2 512MB

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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