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Can I passively cool an I5-3550

 
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post #1 of 10 (permalink) Old 12-20-2019, 11:55 PM - Thread Starter
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Can I passively cool an I5-3550

I'm wanting to passively cool this I5-3550 if I can. Only thing is, it's going in a small case and it'll be on an ITX board. You find things like this out there:

https://www.amazon.com/Dynatron-K618...ustomerReviews

https://www.amazon.com/Dynatron-R15-...ronics&sr=1-22

Which makes you wonder if just maybe it'll work. It will not be a gaming PC. It's just going to be an HTPC. Maybe I can just have a single quiet fan on the back of the computer to gently move air out. So I'll never hear the computer running.

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post #2 of 10 (permalink) Old 12-21-2019, 12:01 AM
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Yeah it'll work. Just don't expect a ton of performance because it's gonna be running pretty hot all the time.

I had a 4790K & hyper 212 evo with a broken PWM fan - so I ran the rig for a week or so with only the front case fans while waiting for a new fan to arrive.

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post #3 of 10 (permalink) Old 12-21-2019, 05:08 AM - Thread Starter
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Well I'd like it to not run hot all the time. So if I have to use a fan, so be it. I'll just get the quietest fans available.

Anyone have a recommendation on a small cooler that works pretty well? That I can use with a fan known to be very quiet.

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post #4 of 10 (permalink) Old 12-21-2019, 05:24 AM
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Any low RPM fan with high CFM (around 75+ are usually a bit more pricey £10-20) should move enough air to cool it at stock clocks without noticing its on but that also depends on the cooler, so u may have o/c room, and that part my man you will have to research as you said ur case is small, so get that tape measure out and start hunting

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post #5 of 10 (permalink) Old 01-06-2020, 12:20 PM - Thread Starter
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I do have another CPU I could use instead, that should run cooler.

So how about passively cooling an I5-2500s? At least it's 65w instead of 77w. I guess my real question is, what's the wattage at which it wouldn't matter? Maybe a 35w CPU wouldn't really warm up with a passive cooler?

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post #6 of 10 (permalink) Old 01-06-2020, 12:51 PM
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I don't believe a Sandy Bridge CPU is less heat over time because it used an older (larger) process for manufacturing than what Ivy Bridge used. Maybe those 65W and 77W numbers are misleading about how much power the two models will actually use?

You can kind of cool things passively, but not really. You do need at least one rear case fan in the system.

If you then use a tower cooler, you could improve things by making your own fan duct that connects the tower cooler with the rear case fan spot. It would then be guaranteed to work well. In a setup like that, I think I'd try installing your single fan onto the cooler and not as a rear case fan. The sound will get muffled somewhat if the fan is hidden deep inside the case.

Take a look at what your motherboard's fan control settings are like in the BIOS. You perhaps have very good controls where you can freely choose min and max speeds and a fan curve. Or maybe you can choose a fixed, low speed. A fixed speed will work well with a stock settings CPU if you have a large enough cooler with heatpipes instead of the crappy Intel stock cooler. If you can limit the max speed of the fan, you will probably not have anything to worry about. There's cheap fans from Arctic that are a good choice if you find out that the fans you currently have are producing strange, annoying noises at low speed like a ticking or whining.
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post #7 of 10 (permalink) Old 01-06-2020, 01:06 PM
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What case is it going in? With a large enough heatsink, you could passively cool those CPU's but it sounds like you're space limited. I agree that you will likely need at least one fan in the system.

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post #8 of 10 (permalink) Old 01-06-2020, 04:02 PM - Thread Starter
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Quote: Originally Posted by deepor View Post
I don't believe a Sandy Bridge CPU is less heat over time because it used an older (larger) process for manufacturing than what Ivy Bridge used. Maybe those 65W and 77W numbers are misleading about how much power the two models will actually use?

You can kind of cool things passively, but not really. You do need at least one rear case fan in the system.

If you then use a tower cooler, you could improve things by making your own fan duct that connects the tower cooler with the rear case fan spot. It would then be guaranteed to work well. In a setup like that, I think I'd try installing your single fan onto the cooler and not as a rear case fan. The sound will get muffled somewhat if the fan is hidden deep inside the case.
Yeah those noctuas are such good fans that I'm sure I wouldn't hear just one of em if I set it to a low speed. That is likely what I will do. Never considered the TDP wattage though. I always just thought 65w would be 65w of heat, regardless of which cpu it may be coming from.

Quote: Originally Posted by Fluxmaven View Post
What case is it going in? With a large enough heatsink, you could passively cool those CPU's but it sounds like you're space limited. I agree that you will likely need at least one fan in the system.
It's going in the Inermax Steelwing. Odd name for an aluminum case. I liked the look of the case, and I always wanted an aluminum case. It's going to be a small HTPC so that's where the desire for quiet comes in. I'm fine with a single low noise (or perhaps no noise) fan, and I assumed I'd probably need one on the back when I started.

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post #9 of 10 (permalink) Old 01-06-2020, 04:29 PM
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if you can passively cool a 9900K at 3.6 on a ~$15 passive heatsink, surely you can passively cool an i5 3550 lol.

open air test bench vs a small case, but also an 8 core CPU vs a 4 core.

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post #10 of 10 (permalink) Old 01-07-2020, 12:20 PM - Thread Starter
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Quote: Originally Posted by The Pook View Post

if you can passively cool a 9900K at 3.6 on a ~$15 passive heatsink, surely you can passively cool an i5 3550 lol.

open air test bench vs a small case, but also an 8 core CPU vs a 4 core.
Interesting video, but I think my question might've been more towards "should do it" vs "can do it". Doesn't look like the chip would overheat, but I also don't want to shorten it's life. At least, not before it's finally time to upgrade it lol. It can die right before that, cause by that time nobody would have much use for it. Once built, I'll leave that 3550 or 2500 in there for 8 years. It's just a htpc that'll never be under any kind of real stress.

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