Ok, at last back at the machine. I have compiled a newer version of memtestCL and here it is:
View attachment 538120
Again, at the Terminal command line, one would type the following for the D300 equipped machines:
This version is reporting no errors for my GPUs so far. The code for this newer version was grabbed from here:
Note: if you test the graphics card used for your monitor, you may notice some interface stuttering.
Note 2: I don't know if you have tried the Apple Hardware Test. If not, maybe worth a try?
After choosing OpenCL device, this is what i get:
Error building CL kernels:
Error returned by cvms_element_build_from_source
Trace/BPT trap: 5
By the way.....Mac Pro is still working fine on Mavericks 10.9.5.