GUI seems to lock, but computer not crashed

II've got a Mac mini 2010 server, that now has 2 x 1TB SSD and 16GB ram (user installed, but , whilst I'm not an expert, it's not the first time I've installed components in a mac). I'm in the process of trying to set it up as a home server, however I've come across a really dod problem.
What happens is that after a period of time (sometimes ten minutes, sometimes twenty, sometimes and hour or so) graphical artefacts appear and then the front end/GUI locks. I can still usually move the mouse, but everything else is frozen. There have also been occasions where I get no artefacts and it just freezes.
There are two things that makes this odd (to me at least).
Firstly, the Mac mini appears to still be functioning behind this GUI crash. For example, if I'm doing a copy operation (as I was last night copying 300 GB of music over) it will still run. Or a YouTube video will continue to play with sound only. And when I SSH in to the mac mini, you can do top and see a list of running processes (note sudo killall [appname] doesn't effect what is displayed on screen and only sometimes kills the processes (I.e. They don't list in the top command anymore).
Secondly, this only happens when I physically interact with the computer for a period of time. If I leave it (not touch it whilst it does the process) copying files or downloading it will happily chug away and not lock up.
I can't see anything significant in the logs, and I've reseated the memory just in case. Am I looking at a graphics card fault here?

An update. Had a look in the logs and found the following. The crash happened at 20:31:21 – I'd completely forgotten I'd written the time down last night.
29/07/2014 20:28:20.468 WindowServer[121]: _CGXHWCaptureWindowList: No capable active display found.
29/07/2014 20:28:20.471 WindowServer[121]: _CGXHWCaptureWindowList: No capable active display found.
29/07/2014 20:29:13.000 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = Graphics Engine Error (GR Error 5)
29/07/2014 20:29:13.000 kernel[0]: IOVendorGLContext::ReportGPURestart
29/07/2014 20:29:13.000 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = Graphics Engine Error (GR Error 5)
29/07/2014 20:29:13.000 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = Graphics Engine Error (GR Error 5)
29/07/2014 20:29:14.150 AirPort Utility[4170]: BUG in libdispatch client: kevent[EVFILT_WRITE] delete: "Bad file descriptor" - 0x9
29/07/2014 20:29:34.750 sudo[4180]: admin : TTY=ttys000 ; PWD=/Users/admin ; USER=root ; COMMAND=/Applications/Server.app/Contents/ServerRoot/usr/sbin/changeip -checkhostname
29/07/2014 20:31:20.242 login[3752]: DEAD_PROCESS: 3752 ttys000
29/07/2014 20:31:21.000 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = Graphics Engine Error (GR Error 5)
29/07/2014 20:31:21.000 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = Graphics Engine Error (GR Error 5)
29/07/2014 20:31:21.000 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = Graphics Engine Error (GR Error 5)
29/07/2014 20:31:21.000 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = Graphics Engine Error (GR Error 5)
29/07/2014 20:31:21.000 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = Graphics Engine Error (GR Error 5)
29/07/2014 20:31:41.000 kernel[0]: NVDA(OpenGL): Channel timeout!
29/07/2014 20:32:01.000 kernel[0]: NVDA(OpenGL): Channel timeout!
29/07/2014 20:32:05.000 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = Graphics Engine Error (GR Error 5)
29/07/2014 20:32:25.000 kernel[0]: NVDA(OpenGL): Channel timeout!
29/07/2014 20:32:25.000 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = Graphics Engine Error (GR Error 5)
29/07/2014 20:32:25.000 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = Graphics Engine Error (GR Error 5)
29/07/2014 20:32:25.000 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = Graphics Engine Error (GR Error 5)
29/07/2014 20:32:25.000 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = Graphics Engine Error (GR Error 5)
29/07/2014 20:32:25.000 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = Graphics Engine Error (GR Error 5)
29/07/2014 20:32:25.000 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x6 = DMA Engine Error (FIFO Error 6)
29/07/2014 20:32:45.000 kernel[0]: NVDA(OpenGL): Channel timeout!
29/07/2014 20:33:05.000 kernel[0]: NVDA(OpenGL): Channel timeout!
29/07/2014 20:33:25.000 kernel[0]: NVDA(OpenGL): Channel timeout!
29/07/2014 20:33:45.000 kernel[0]: NVDA(OpenGL): Channel timeout!
29/07/2014 20:34:05.000 kernel[0]: NVDA(OpenGL): Channel timeout!
29/07/2014 20:34:26.000 kernel[0]: NVDA(OpenGL): Channel timeout!
29/07/2014 20:34:46.000 kernel[0]: NVDA(OpenGL): Channel timeout!
29/07/2014 20:35:06.000 kernel[0]: NVDA(OpenGL): Channel timeout!
I'm also noticing that this happens when I am running chrome. Killing it via ssh will see the system return, after a period of time (again could be like 10-20 minutes though).

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