Guess what? The FX 1800 is NOT supported for GPU acceleration in ANY version of Premiere Pro – even the CS5 version, the first to support CUDA – because it has only 768MB of RAM. MPE GPU acceleration, even in CS5, requires at least 765MB of free, unused graphics RAM; however, the Windows UI itself eats up nearly 20MB of graphics RAM on its own. That leaves less than 750MB free on a 768MB card – too little to even enable GPU acceleration at all.
And starting with CC 2015.3, the Tesla-architecture GPUs are no longer supported at all for GPU acceleration because these newer versions of Premiere require the driver branch version that was current at the time of that CC version's release, or newer, just to even enable GPU acceleration. Unfortunately, the last version of the drivers that were compatible with the legacy Tesla-architecture GPUs was only version 342.01, which although released in December 2016, actually was only a security patch of a driver version that dated all the way back to late 2014 – and that's too old for newer versions of Premiere. CC 2015.2 was the last Premiere version to support legacy Tesla-architecture GPUs because although driver development for such GPUs ended in late 2014, security patches were still being written for such GPUs at the time 2015.2 was released. Security patch development for the 340 branch of nVidia drivers ended in April 2016; however, the release of 342.01 was held back to December of that year.
Oh, by the way, the FX 1800 dates all the way back to 2009. And the architecture behind that FX 1800 dates back even further, all the way back to the first 8800 GTX of late 2006! (Though the FX 1800 uses a cut-down version of a GPU that was used in the GTX 260, which was released the same year as the FX 1800.)
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