WEBVTT

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did you know that you can overclock a graphing calculator for fun and profit

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yeah so we called up texas instruments and we're like hey guys can you send us

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some calculators to overclock so they sent us this one which

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this doesn't look like a calculator like it does that looks exactly like a

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calculator what are you talking about but it doesn't look like the calculator no it's not the calculator so we

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actually had to go digging through

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alex's sentimental drawer where we found

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the very ti 84 plus that got him most of

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the way through engineering school and also most of this job so i guess what

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you're trying to say is you'd like for us to not break it yes

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well good luck with that xsplit makes powerful streaming pc apps

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for streamers vloggers and more check out their vcam app to change or blur

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your background without a green screen learn more at the end of the video

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before we go any further we should probably address why anyone would want

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to overclock a graphing calculator now one obvious reason is that when you

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enter a more complex function in them they can actually take a hot minute to

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spit out the results but there are some even more fun and geekier reasons than

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that doom playing doom on your calculator in class turns out that's a

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thing you can do and the more you overclock it the faster it'll run doy of

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course to quantify the benefit of our experiment here we're going to have to

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set a baseline so let's get doom installed on this puppy and see how she

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runs all right so in order to get programs onto your

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calculator you just get ti connect it has not changed since i used in high

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school go to send to device all right so

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calculator overclocking in here we have doom 2 runs a bit better so let's toss

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that on wow the hat animation i remember but the pages and

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when you deleted things how the page would just oh my gosh

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yeah this is pretty slow to uh render new frames oh i think i got a new

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oh pistol bang bang bang bang bang hey back off before he first oh he hit me

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yeah these frames render a little on the slow side i can see how this experience

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could be enhanced with a faster calculator

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that's it eh that's the brain yep we need to find out how much power it's

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drawing so that you know you can't design a thermal system

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without knowing how much power you're drawing so first thing we need to do is

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power it that's flux you're just gonna solder leads to it positive and negative

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let's tin some wires here suckas this is nice normally they don't let me

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use the soldering iron well oh yeah the soldering that's coming in a bit you are

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not doing you can do this one like look at the landing pad you're not doing the harder

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ones look at this that i did this morning

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that is pretty impressive yeah assuming that it actually still works i have no

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clue okay so let's see if i did it right

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hey it's live yay

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he was a little nervous i saw him okay so i was slightly concerned about this

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uh it's drawing so little power that it's not registering on our power supply

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here yes so we're gonna have to

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calculate it a different way one moment so all we need to do is hook up to our

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multimeter which should tell us how much current we're drawing .001

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amps can you change the range and see if we can get that a bit more precise

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no you know what though i bet what we could

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do is actually do something on the calculator so i'm going to take that from you and i'll sanitize my hands

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after and then you do something

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like run doom for example okay so we're gonna graph now

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oh yeah 0.013

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is the max 0.091 watts of heat to dissipate

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for the total thing including the display so 0.1 watts yeah i think we've

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got this and we're taking this one step further

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what do you think the temperature is going to be 25 degrees

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i was thinking 24 and a half heating up boys i can see it it's

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integrating now you got the 24.5 24.5 i saw it 24.6

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yeah i win wow

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meaningless victory only if you round though i was closer

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dang it now that we have our baseline

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what do we need to overclock this thing as you can imagine there isn't exactly a

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BIOS that you can go into and change the multiplier a wild Anthony appears in our

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calculator and many older electronics the CPU speed is regulated by a resistor

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capacitor or rc oscillator we'll be simplifying a bit here so if you want a

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bit more of a complete explanation go ahead and watch this excellent video

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from ben eater basically how an rc oscillator works is you use a transistor

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or an op amp to compare the voltage between this capacitor and some voltages

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we set so when the voltage of the capacitor is

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below a certain threshold power is applied and then it is removed once it

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hits that threshold creating an oscillating motion which gives us the

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clock of our CPU to overclock in that case all we need to

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do is swap this resistor out to change the

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threshold

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which gives us a much faster rise and fall

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we're going to use that with our ti 84 to increase our clock speeds that sounds

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easy enough until you see the size of the resistors that we're dealing with

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we need to replace r07d

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and r08d so these are the two right here

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and as you can probably tell by how massive these tweezers look

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they are super tiny and i am not excited

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about this now this is the part that has the greatest risk of just completely

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killing everything so i'm going to have to use the hot air gun while pulling on

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the resistor and hope that the resistor that i want to

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come off comes off and no other bits do if i slip then i might destroy

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it it worked i got it off right there those

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are the pads that i have to land the solder on and this is the size of the resistor in

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theory we should be able to overclock it with just swapping one so what about we

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only swap one see if it works

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and then we can swap two and we'll have a larger range of potential overclocking

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after the cameras turned off last night i kept on working on this

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we had a bit of a problem you know how like you tried it as well yep nothing was

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sticking to the pads turns out they were gone yeah totally gone no pads at all

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ripped them right off fortunately there's another resistor right next to

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it that happens to be wired up in parallel so we were able to solder onto

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that one attach the potentiometer and

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overclocking works now yeah it works it's not 100 stable at the moment well

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that's overclocking for you yeah and i think that the reason for that is that like it needs water cooling

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it needs water cooling and also like it's a resistor capacitor thing that

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makes this whole clock circuit work yeah and with these long leads here we're

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adding capacitance so when we shorten these to like their

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final length got it it should be a lot better to make sure i understand

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properly it is your intention to continue using this calculator in its

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water-cooled overclocked state correct oh yeah it's like it's my calculator and

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it's now going to be maybe the coolest calculator in the world and i'll be building the most ridiculous water

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cooling loop you ever did see

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absolutely perfect would you look at that final block assembly here we go

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we're also going to have to make these leads shorter and the other thicker

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leads much shorter how short do you want it uh let's not

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make it much shorter so that we can shorten it later when we know how long

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it needs to be exactly this is the overclocking dial you better not bump

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that too far by accident a bump will be like 300 megahertz how are we going to

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solder it on even what do you mean well it's going to have to be long enough that we can get at it

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before we close it okay we should be able to find it

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we shouldn't have cut it we should have just yeah we probably shouldn't have cut it i

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knew it i had such a bad feeling about it oh that's quite a good tape job thank

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you thank you Linus if anything was going to go horribly wrong it already

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would have yeah you better do that better find the

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hardest wood possible knock on it for days i think this RGB

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reservoir sphere might be the most german thing i've ever filled with water

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uh well i forgot that you had the

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CPU block and these tubes were just open

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on the table and i was sitting here filling the reservoir real focused on

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doing a great job of pouring and the table is covered in water now the good

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news is i think i've got a better idea for how to fill it now oh

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just look at the block size compared to what we're actually cooling

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that is about as riced out as a calculator it could be

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oh there we go all right now oh there you go

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is it actually circulating water in there though it doesn't look like it

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well we better go fast we don't want it to overheat while there's no water flow

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what is coming through oh okay good enough this thing's horrible don't

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buy it she did it

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yes we have a water cooled calculator

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we do yeah absolutely amazing you know the funny thing is we're gonna go and

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play doom again and it took so long to get this done i'm not gonna remember if

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there's any difference i don't make this might actually be running faster oh

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it definitely is it's actually like noticeably faster

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this like dramatically exceeds my expectations

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look at this like i can actually kind of move around

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that's crazy because that difference is from 16 to

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18.7 megahertz we can try and get just a tiny bit more

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and see what it's like doing a live

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speed increase is it still running yeah

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okay let's just try and take in time before oh yeah it's faster it's faster

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loading that map there son

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look at here all right let's let's take it a tiny bit

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further let's see when it becomes unstable wow look how quickly

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it's loading now oh yeah that's like this is this is a big difference

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it seems to be taking it let's just push it until it's you know not stable

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anymore these are basically loading pretty much

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instantly wow

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26.8 damn

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so the reason why it's getting so garbled is definitely because

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it's not stable it's not stable then also it's like

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the flash for some of the cycles is just not there 26 megahertz that's a whole 10

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megahertz faster than before 10 million hertz if you guys enjoyed

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this video you might also enjoy the series where alex and i go through the

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grueling process of water cooling a red 8k camera that one was very frustrating

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but as long as it's entertaining for you guys it's totally worth it right yeah

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right i wasn't sure what he was going to say i'd like to thank everyone that helped

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us out on this particularly the people on the chem tech forums

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rs barges aka dr dinar and christopher michael aka kerm martin also virtual

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flak cad for the sick ti-84 model and of course tex instruments for

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the well the calculators that we didn't end up using but they still sent them it

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was nice thanks to xsplit for sponsoring today's video xsplit's vcam can remove

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Linus tech tips to get 10 off at the link in the video description i'm very

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happy about this it's my new favorite thing you know what you should totally do is pull a that

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stupid manufacturer say water cooled RAM where

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it just like has water in it and just put plugs in it and just fill the block

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with water oh that was my plan oh nice i love it