Compare any two graphics cards:
GeForce 9500 GT 1GB GDDR3 vs GeForce GT 240 GDDR5
IntroThe GeForce 9500 GT 1GB GDDR3 features a clock speed of 550 MHz and a GDDR3 memory frequency of 800 MHz. It also uses a 128-bit bus, and makes use of a 55 nm design. It is made up of 32 SPUs, 16 Texture Address Units, and 8 Raster Operation Units.
Compare all of that to the GeForce GT 240 GDDR5, which has a core clock frequency of 550 MHz and a GDDR5 memory speed of 850 MHz. It also makes use of a 128-bit memory bus, and uses a 40 nm design. It features 96 SPUs, 32 Texture Address Units, and 8 Raster Operation Units.
(No game benchmarks for this combination yet.)
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
Theoretically speaking, the GeForce GT 240 GDDR5 will be 113% faster than the GeForce 9500 GT 1GB GDDR3 in general, due to its higher data rate. (explain)
Texel RateThe GeForce GT 240 GDDR5 should be quite a bit (more or less 100%) better at AF than the GeForce 9500 GT 1GB GDDR3. (explain)
Pixel RateBoth cards have the exact same pixel rate, so theoretically they should be equally good at at full screen anti-aliasing, and be capable of handling the same screen resolutions. (explain)
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.
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.
Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of MB per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If 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 high 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 amount of texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.
Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.