It was running the small FTT one seeing as Memtest ran for 32 hours with no errors. Also, because I got rid of all my tempeture reading software to illuminate the cause I have no idea, plus I wasen't at home during the test when it crashed, so I have even less of an idea.
However, assuming the watercooling didn't fail halfway during the test (its a swifttech H220, dual 120mm radiator) at stock speeds it used to run at max load at roughly 50C.
