Faq

Which test is the best at detecting hardware errors ?

CPU:OCCT, Large data set, with Auto number of threads is, hands-down, what will detect CPU/Memory/Motherboard stability issues faster. Use GPU:3D in fullscreen mode for GPU testing, GPU:Memtest for testing your Graphic card's Memory, and Power supply for testing your PSU. Most errors are detected within the first 5 minutes. However, i recommend doing at least a 1 hour long test just to be sure.

Which test puts the most stress on the CPU ?

If you have an Intel CPU, try the latest Linpack version available. OCCT's CPU Test with Small data set is the best on AMD CPUs, and a close second on Intel CPUs.

GPU:3D and furry donut based tests are Power virus

NO ! A Power virus is a stress test that you do not have control upon. This term was applied to OCCT's GPU test when we launched its first version, 10 years ago, by the marketing team of a certain brand of graphic card's manufacturer, when their shiny new graphic card could not withstand the test at all - it blackscreened instantly and required a reboot. This was due to a design failure of their reference design board. I don't know why the term stuck, despite being wrong. GPU:3D is a stability test just like the others.

Starting at how many errors do you consider a computer unstable ?

Seriously : One.

The Memtest says "crashed" right after starting ?

This may happen when there's not enough contiguous memory available for the test - use a lower value to get around this ! ( this is scheduled to be fixed with a more meaningful error message very soon)

Why isn't GPU Memtest's allocating all the memory on my card ?

A part of the memory of your Graphic card is allocated by the OS (for rendering the desktop and such), and other applications. The test goes to the maximum allowed memory allocation on your graphic card - until OpenCL spits out an error in fact. This usually ends up being more than 90% of your graphic card's total memory, depending on your graphic card model and your current usage, mostly.

Do I have to purchase OCCT to know where the errors come from ?

No ! The Free version has always been designed to be usable "as is". OCCT isn't withholding information from you (I would call that stealing). It detects errors, but can't tell you where they come from. On the software point of view, it is as if it asked the for 2 + 2 and got 5 as an answer.

It is because the CPU miscalculated and answered that 2 + 2 = 5 ?

Is it because the memory stored a 3 instead of a 2 ?

Is it because when transferring the 2 from the memory to the CPU, the 2 got transformed to a 3 ?

As there's no sure way of reproducing the error that occurred, there's no way of knowing what is going on. To further pinpoint errors, you have to dig yourself : lower the CPU frequency a notch and see if things are going better, up a voltage very carefully and see if it holds better... and pinpoint where the errors comes from. If you have access to spare parts, it is even easier to diagnose : replace and see what's going on.

I lost my license : how can I get it back ?

Send an email to support@ocbase.com and please give us at least a day for sending you your license back.

I am not using OCCT in a commercial or professional environment, yet my computer is joined to a windows domain. Can i run OCCT ?

Only the PRO version of OCCT will accept to launch on a computer joined to a windows domain. This is meant at detecting uses in professional and commercial environment, as they heavily rely on Windows domain. In the past, as there are enthousiasts that have a Windows domain at home, we offered a way of disabling this check as they were indeed not in a commercial environment, but this saw too much abuse. About 90% of the requests were from people trying to avoid the PRO license entirely. We thus removed that possibility, and you indeed need a PRO license now to run OCCT on a computer joined to a Windows domain.