Small FFT's test CPU cache and very little memory.
Large FFT's access' a lot of memory - but in-place option keeps it limited
Blend is not run in-place, so it cycles the tests through a lot of RAM
All tests stress the CPU
In-place large FFT's and Blend also test CPU/RAM interface (mobo in all but Athlon64)
In-place large FFT's stress CPU more than Blend
MemTest is better at testing RAM
You have fast crashes in Blend - and not so fast in In-place large FFT's. The difference here is the amount of memory tested. I'd suggest running MemTest overnight just to be sure.
If it's not RAM, then the other forms of memory will be tested by the stress tests that I mentioned above.
Prime 95 tests 3 things:
- CPU/RAM interface (mobo in all but Athlon64)
So, it's most likely that you have some sort of memory issue, with the CPU/Memory interface (mobo) being next most likely, and the CPU being the least likely.
Run the stress tests and let's see what you've got.
FWIW - the distinction between RAM and different types of memory in the system is one that I've made. The documentation that I've read speaks of RAM issues and CPU cache - and doesn't mention the other aspects. BUT, this is just speculation on my part, so we'll have to see how it works for us.