8 gigs of ram is only okay for low-med quality reconstructions with limited amount of photos. Your GPU is fairly low end as well, but even with powerful GPU and just 8 gigs you'll still run out of memory on larger/higher quality projects and keep processing forever. When running out of memory, Windows tries to use a HDD swap file in place of memory which makes processing hundreds times slower. SSD is faster than HDD but that will only make your builds, say, 50 times slower instead of hundreds times slower, when compared to builds fit well within system memory. Definitely upgrade your RAM if you can.
There are some rough memory requirement estimates to be found on agisoft website, although I am not sure if they were updated once Photoscan switched to less memory-hungry algorithms...
-Andrew