This leads to your computer switching to Virtual Memory, which is basically using your hard disk as a RAM, and lots of hard disk accesses. The Blend test allocates large FFTs and some of these large sizes might not be enough for your physical RAM as well. Since the blend test uses your whole RAM, a fail in this test (and not others) is a solid indicator of a bad RAM. This is because the large FFT sizes in Blend mode aren’t In-place so the same portions of RAM won’t be accessed over and over. When you select the Blend configuration, it will select all of your RAM for testing. So, it is obvious that with Blend mode you will test both your CPU and your RAM as well. The small FFT sizes will test your CPU more (just like the small FFTs) and large FFT sizes won’t be enough for the CPU cache so they will use the memory as well. This means that it will select both small as well as large FFT sizes. The Blend mode mixes both the Small FFTs and the Large FFTs. However, it doesn’t access the main memory a lot in general mainly because it accesses the same portions of RAM over and over again. Unlike Small FFTs, these large FFTs won’t fit in your CPU cache so it will result in a lot of main memory accesses when compared to the Small FFTs. This configuration, as the name suggests, uses large FFTs. Since this FFT is small and fits in your CPU cache, this will result in almost no or very few main memory accesses. If you select this configuration, the Prime95 will select a FFT size that is suitable for your CPY L2 cache. This is what the Small FFTs configuration is. The Small FFTs description in the dialog box says maximum FPU stress, data fits in L2 Cache and RAM not tested. 3 of the options will be a pre-set configurations and the 4 th one will be the custom option. You will see a total of 4 options to choose from. Since Prime95 puts your computer through a very tough and rigorous math test, FFT algorithms are used for calculation purposes. In short, it is an algorithm that is used in Prime95 to find the square of large numbers. Basically, FFT stands for Fast Fourier Transform. The first thing you will notice while selecting the type of torture test are the option names that have the FFTs in it. Almost every computer nowadays have a FPU chip or coprocessor that have the sole purpose of performing different calculations. Make sure -A1 is out of the parenthesis.īasically, Prime95 tests your CPU for the maximum amount of FPU stress that it can take. You can also make a shortcut of Prime95 on the desktop and do the following: Right click Shortcut > Select Properties > Type -A1 at the end of the address in Target field. You can run 2 instances of Prime95 by installing Prime95 in another folder and then running it after the first one. This is because one instance of Prime95 won’t be able to detect the failure/instability. If you have Hyper Threading on an Intel chip then you need to run 2 instances of Prime95.Prime95 is through enough and should be used with other stress testing programs Do not run Prime95 with any other stress testing program.The other option is, of course, to stop the Prime95 stress test if you think it has run for a sufficient amount of time. Prime95 runs indefinitely and only terminates a stress test when it encounters an error and informs the user that the system may be unstable. It tests your computer for stability issues by stressing your CPU to its maximum limit. There are quite a few different computer stress test utilities out there, but Prime 95 – which was a piece of freeware originally designed to find Mersenne prime numbers – is the most widely used and most accurate one. Stress tests are incredibly accurate and nifty when it comes to determining how stable and error-free a computer really is. A CPU stress test is a thorough analysis conducted to measure the stability of a computer either for informative purposes or to determine whether or not it should be overclocked and to what degree it can be overclocked.
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