Each of these options have its own advantages and drawbacks. Some beginners might miss that aspect of the stress testing. The Blend configuration is also a very reasonable configuration for stress testing but it always have some chances of messing up with the results (see Blend configuration section above). We will recommend using the in-place large FFTs configuration because it stresses CPU the most. However, as mentioned above, Prime95 is not a RAM checker so don’t consider the Blend configuration as a proper RAM test. Most of the people prefer the Blend configuration mainly because it checks both your RAM and your CPU. You can check the how much stress each of these configurations put on your CPU by keeping an eye on the CPU temperature as well. So, if a chip is really hot then it usually means it is really stressed. Note: Chips are known to get really hot when they are stressed and performing a lot of calculations. It doesn’t make a lot of RAM accesses and doesn’t stresses the CPU at its maximum. The Small FFTs is at the bottom when it comes to stressing the CPU. So, checking your RAM with a proper memory tester program is recommended. ![]() It is an indicator that there might be a RAM problem. A test fail in Blend doesn’t necessarily means a RAM problem. But, keep in mind that Prime95 is not a RAM tester. However, since the blend test accesses the whole RAM, a test fail in Blend configuration will indicate a problem with the RAM. It falls a little behind the in-place large FFTs because you’re CPU have the whole RAM (and hard disk in worst cases) which means that it might have to wait for the RAM accesses. The Blend configuration comes at the second place when it comes to stressing the CPU. Although it’s an in-place testing which uses the same portion of the RAM for each calculation, the accesses are quicker and CPU doesn’t have to wait for the accesses as much as in the Blend configuration. This is mainly because the large size FFTs forces a lot of memory accesses. The large in-place FFTs option is the one that stresses your CPU the most. Time to run each FFT size (in minutes): This option sets the time that the Prime95 should spend on a single FFT until it moves on to the next. ![]() This option sets the size of the RAM to be used for calculations. Memory to use (in MB): This option will be available if the Run FFTs in-place option is disabled. If this option isn’t checked then the Prime95 will use all the RAM for its calculations. This portion of the RAM will be selected based on the requirements of the calculations but the same portion will be over written for each calculation. Run FFTs in-place: This option, if checked, forces the Prime95 to use the same portion of the RAM over and over again. So, make sure that the numbers you enter are from this list. Prime95 will hang if the entered numbers aren’t from this list. So, keep the list in mind while entering the limits. So, when you will set a range by entering numbers in min and max fields, Prime95 will go through all the numbers that will fall within the given range. It has its own list of sizes that it can use. Note: Prime95 cannot go through a completely custom sizes. Prime95 uses the min and max limits to cycle through all the FFTs within that range. Max FFT size (in K): This will set the upper limit of the FFT sizes. Keep in mind that the number you enter won’t be the same exact size but it will be multiplied by 1024. You will set the lower limit of the FFT sizes that the Prime95 will use. Min FFT size (in K): This is the minimum size of the FFTs. Here are the parameters that can be tweaked in this option This option lets you play with some of the parameters of the tests and lets you make your own test. You also have the Custom option in Prime95.
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