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why would anyone run an app that is specifically designed to crash their

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computer that's a good question and I have some

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pretty good answers stress testing applications can make your computer

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overheat or even outright crash but in

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doing so they can also reveal weak points in your system that could have

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led to bigger problems like instability or even data loss but of all the options

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out there for CPU stress or burn applications which one is actually going

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to hit your CPU the hardest the answer spoiler alert is prime95

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at least in terms of heat but the whole story is a lot more complicated than

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that and we just couldn't tell it without our sponsor cable mod cable mod

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them with their realistic cable preview we're going to have them linked down below like test driving a vehicle stress

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testing is an important part of Savvy PC shopping and maintenance but let's say

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you've never done it before you head on over to Google Smash in some keywords

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and oh that's a lot of options you got

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your blender cinebench R20 and cinebench R23 occt prime95 CPU expert heavy load

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Linux Intel XT ryzen Master Intel princess 64 Lin pack extreme

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and that's all just for the CPU the

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unfortunate reality is that there is no Silver Bullet best test and depending on

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your Hardware software and what you're trying to accomplish you could end up

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with completely different answers so yeah we spoiled the conclusion prime95

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runs the hottest but even then which of the five tests 10 if you include the

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avx2 checkbox should you run to find out we built up two identical

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PCS with just two differences motherboard and CPU here's the thing we

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suspected the team blue and team red might behave differently under extreme

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conditions and we're really glad we tested both because they absolutely did

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on both platforms though we also locked our CPU clock speeds core voltages and

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fan speeds leaving just our CPU temperatures as our stress indicator

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time to show the graphs give them a graph editor

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Intel first two tests didn't work at all

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rise and master we saw that one coming and Intel extreme tuning utility

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we didn't see that one coming it ended up erroring out the same way in Windows

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11 that we saw in our recent Dragon Canyon Nook video among the tests that

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did work prime95 small fft stood

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absolutely alone beating out the next highest score by 10 freaking degrees

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there's just no other way to put this we

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did not believe our results so thinking that maybe Intel's turbo

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boost power management was bunging up the other tests or something we re-ran

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the entire Suite with our voltages and our clock speeds back to stock and to

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say I'm shocked would be putting it mildly it was like witnessing a brutal

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beat down in slow motion again

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we have some theories here but first let's get to the rest of the results our

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10 middle performers had just a six degree overall spread then we had our

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underperformers Intel burn test CPU-z

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and occt's CPU large data set extreme

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benchmark at this point you can probably see why we declared Prime 95 best in heat but

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looking at Thermals alone would be a huge mistake check out the heat profile

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and power consumption profile of prime95 small fft huge spikes then they just

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hold indefinitely it achieves this by

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repeatedly performing demanding mathematical calculations but on a data

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set that's so small it fits right in the CPUs on die Cache no bottlenecks maximum

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burn but obviously no real world application behaves like that even

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notoriously demanding professional workloads like CPU rendering and blender

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or video encoding will generate very

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different profiles so if I was validating a thermal design for a

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demanding client and I wanted to see an absolute worst case scenario Prime 95

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needs to be part of my toolkit but if I

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care more about stability in real world applications I need to look elsewhere

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enter linpak the mo most used stability stress testing tool of all time it was

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originally created for use on super computers in the 1970s and in a nutshell

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it's a software library that performs linear algebra this equation

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specifically on repeat and it still behaves the same way today except it's

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been rehashed multiple times to keep up with modern computers which is pretty

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important considering that it was written in Fortran a code language that

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is so old it was originally input via punch carts fun fact by the way because

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linpak is a library not an application it's easy for developers to integrate it

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into their own test Suites and six of the tests we used are actually Lin pack

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based but even then not all tests are

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equal because there are multiple Lin pack versions and any of those can be

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combined with other methods to create a complete hodgepodge of stress for your

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poor CPU this is what a limpac load looks like on

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our thermal graphs a spiky wave gets produced as each equation is solved then

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there's a brief pause between calculations and now that we know this

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it's really easy to spot this shape in many of the tests that we ran now if we

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switch from temperature to power consumption we see well the same thing

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these swings in power are really tough on not just your CPU but also your

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motherboard vrms and your power supply which is a perfect combination for

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evaluating stability which we're definitely going to check out on AMD's

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New 3D zcash CPUs so get subscribed so

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you don't miss it also buy a shirt or a water bottle haha lttstore.com on that

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note let's take a look at our AMD results here we didn't see anything that

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seemed anomalous so we left our voltages and clock speeds locked per our original

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test methodology to start with AMD ran

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much cooler overall with Delta T's so that's the temperature difference

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between ambient and our CPU peaking at

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just 39 degrees compared to Intel's 56. man 12th gen performs but lordy is it

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ever hot now prime95 still came on top for

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thermal stress but only barely just half

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a degree behind was Ida 64. then the

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middle of our chart doesn't have the same flat middle Zone as Intel instead

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there's a fairly consistent decline with a spread of about 10 degrees note by the

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way that rise and master did run but it's right near the bottom of these

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thermal stress loads we don't know for sure why that would be but my tinfoil

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hat says that maybe AMD doesn't want you to cook your CPU I don't know though

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even ignoring ryzen Master we can draw some interesting conclusions here in if

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you want to hit it hard it's prime95 for maximum heat output with Ida 64 FPU as a

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close runner up as for stability well we already learned

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that this is not what we're looking for we want a rapidly oscillating power load

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so let's have a look at one of our Lin pack loads occt linpak 2021 and oof look

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at that power draw porcupine right there 35 Watts bikes roughly 6 times per

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minute how about Linux again very nice

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very stable clock speeds which we expect since we locked it but we still saw some

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intermittent clock drops and huge swings

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in power draw from 82 Watts all the way to 170 Watts this is probably the best

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example we could have hoped for to show you why you need to test with multiple

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pieces of software every one of these is a valid part of your stress test toolkit

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yet each is different sitting down and inspecting these results though lead to

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some pretty tidy conclusions for you to take with you if you want to get in and

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out quickly Prime 95 is going to give you thermal results on air in about 15

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minutes and on an a a water cooler in about 30 to 40 minutes as for stability

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a Lin pack load like Linux occt linpak

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or linpak Xtreme are the best bang for your time bucks

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unfortunately for those ones I can't give you a firm guideline for how long

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you need to run them though because it comes down to personal preference for a

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gaming test bench I might be comfortable with 10 minutes but for a video editing

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workstation that I want years of service from 24 to 48 hours isn't out of the

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question also none of these synthetic

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loads excuse ignoring real world ones if

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you've got the time and if you're serious about it a blender render or

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continuous cinebench run followed by a few rounds of Puget bench would

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absolutely be a good idea now it may not be common knowledge but the tools that

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we use to log and review our data today are both free for personal use HW info

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and generic log viewer and you can check them out at the links in the video

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description HW info allows you to log all your sensor data while generic log

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viewer gives you a perfect tool for quickly and easily charting that data

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and comparing against other runs what I hope is common knowledge though is our

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interested in this sort of thing why not check out whole room water cooling that

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was a stress test on us haha that's very funny I like your joke that you wrote

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foreign