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GeForce 9800 GX2 vs GeForce GTX 650

Intro

The GeForce 9800 GX2 features a core clock speed of 600 MHz and a GDDR3 memory frequency of 1000 MHz. It also makes use of a 256-bit memory bus, and makes use of a 65 nm design. It is comprised of 128 SPUs, 64 Texture Address Units, and 16 Raster Operation Units.

Compare those specs to the GeForce GTX 650, which uses a 28 nm design. nVidia has set the core frequency at 1058 MHz. The GDDR5 RAM runs at a frequency of 1250 MHz on this specific model. It features 384 SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 64 Watts
GeForce 9800 GX2 197 Watts
Difference: 133 Watts (208%)

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GX2 should be much faster than the GeForce GTX 650 overall. (explain)

GeForce 9800 GX2 128000 MB/sec
GeForce GTX 650 80000 MB/sec
Difference: 48000 (60%)

Texel Rate

The GeForce 9800 GX2 will be a lot (about 127%) more effective at anisotropic filtering than the GeForce GTX 650. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
GeForce GTX 650 33856 Mtexels/sec
Difference: 42944 (127%)

Pixel Rate

The GeForce 9800 GX2 will be a little bit (about 13%) more effective at FSAA than the GeForce GTX 650, and also will be able to handle higher resolutions without losing too much performance. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
GeForce GTX 650 16928 Mpixels/sec
Difference: 2272 (13%)

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

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GeForce GTX 650

Amazon.com

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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 GeForce GTX 650
Manufacturer nVidia nVidia
Year Mar 2008 September 2012
Code Name G92 GK107
Memory 512 MB (x2) 1024 MB
Core Speed 600 MHz (x2) 1058 MHz
Memory Speed 2000 MHz (x2) 5000 MHz
Power (Max TDP) 197 watts 64 watts
Bandwidth 128000 MB/sec 80000 MB/sec
Texel Rate 76800 Mtexels/sec 33856 Mtexels/sec
Pixel Rate 19200 Mpixels/sec 16928 Mpixels/sec
Unified Shaders 128 (x2) 384
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 28 nm
Transistors 754 million 1300 million
Bus PCIe x16 2.0 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.0
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of MB per second) that can be transferred past the external memory interface in one second. It's worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 texture map elements (texels) that are processed per second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the video card could 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 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 fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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GeForce 9800 GX2

Amazon.com

Check prices at:

GeForce GTX 650

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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