Comment on Looking to build my first PC in almost 30 years; What should I be on the look out for?
CosmicTurtle@lemmy.world 4 months agoI remember working on a PC back in my Geek Squad days that had a lever.
For air circulation, what should I be on the lookout for? Making sure I have clearances, of course, but should I buy more fan that I need?
lobo@lemmy.world 4 months ago
Case usually have fans preinstalled that should be fine. Just pay attention to the direction, have tham all blow air front to back. There is usually an arrow indicating which way it moves air.
Run a benchmark after buiding the PC and check temperatures.
fuckwit_mcbumcrumble@lemmy.world 4 months ago
Don’t just look at temperatures though, look at clock speed too. 95c+ is normal for modern high end CPUs (AMD 7000 series actively try to run at that temp under full load). What you want to make sure is that it’s not throttling.
If this is a server and you don’t want your thermal paste to be toast in a year then I’d suggest lowering the maximum temperature in the bios if it lets you.
jjlinux@lemmy.ml 4 months ago
That and you need to decide what how much positive or negative pressure you want in there as well. You could always do some calculations. Treat your case as an open control volume where mass can transfer across the boundaries. Then the sum of air going into and out of the case must equal the rate of change of air in the case. Assuming the volume of air in your case is constant, this term would be zero. So you can look at the rated volume flow rate for each fan (CFM - aka cubic foot per minute) and see if this summation is positive or negative. A positive value would mean “positive pressure” and a negative value “negative pressure”. The only problem is if the fans are not running at max RPM and/or the rated CFM value - which is the case if you have your fans plugged into the motherboard( regardless of whether you’re using PWM or 3 pin). In this case, you would have to calculate the volume flow rate of each individual fan as a function of the RPM. This may not be a linear function and would probably require taking some data and coming up with a regression for the data. This would be way harder to do.
tldr: add up the CFM going into the case, subtract the CFM leaving the case. If the value is positive you have “positive pressure”