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GeForce 9800 GX2 vs Radeon HD 4750

Intro

The GeForce 9800 GX2 makes use of a 65 nm design. nVidia has clocked the core frequency at 600 MHz. The GDDR3 memory runs at a speed of 1000 MHz on this card. It features 128 SPUs along with 64 TAUs and 16 ROPs.

Compare those specifications to the Radeon HD 4750, which uses a 40 nm design. AMD has clocked the core speed at 730 MHz. The GDDR5 memory works at a frequency of 800 MHz on this model. It features 640(128x5) SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750 75 Watts
GeForce 9800 GX2 197 Watts
Difference: 122 Watts (163%)

Memory Bandwidth

Theoretically, the GeForce 9800 GX2 should be quite a bit faster than the Radeon HD 4750 overall. (explain)

GeForce 9800 GX2 128000 MB/sec
Radeon HD 4750 51200 MB/sec
Difference: 76800 (150%)

Texel Rate

The GeForce 9800 GX2 should be a lot (more or less 229%) better at texture filtering than the Radeon HD 4750. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
Radeon HD 4750 23360 Mtexels/sec
Difference: 53440 (229%)

Pixel Rate

The GeForce 9800 GX2 is much (about 64%) faster with regards to full screen anti-aliasing than the Radeon HD 4750, and should be capable of handling higher resolutions without losing too much performance. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
Radeon HD 4750 11680 Mpixels/sec
Difference: 7520 (64%)

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 9800 GX2

Amazon.com

Check prices at:

Radeon HD 4750

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 9800 GX2 Radeon HD 4750
Manufacturer nVidia AMD
Year Mar 2008
Code Name G92 RV740
Memory 512 MB (x2) 512 MB
Core Speed 600 MHz (x2) 730 MHz
Memory Speed 2000 MHz (x2) 3200 MHz
Power (Max TDP) 197 watts 75 watts
Bandwidth 128000 MB/sec 51200 MB/sec
Texel Rate 76800 Mtexels/sec 23360 Mtexels/sec
Pixel Rate 19200 Mpixels/sec 11680 Mpixels/sec
Unified Shaders 128 (x2) 640(128x5)
Texture Mapping Units 64 (x2) 32
Render Output Units 16 (x2) 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 65 nm 40 nm
Transistors 754 million 826 million
Bus PCIe x16 2.0 PCIe 2.0 x16
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

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

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce 9800 GX2

Amazon.com

Check prices at:

Radeon HD 4750

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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