Heat Sink Shootout: heatsinkusa's 3.945 -vs- 4.6
- Thread starter Rahz
- Start date
coloradolivin
Well-Known Member
how much do these cost? I just use the heatsinks off a pentium II or other old computer that had LED chip size CPUs they work a treat and are incredibly cheap.
nogod_
Well-Known Member
This is Amazing. With fan on it? pics of how smooth its sanded? 35w?
We need more of this on here. Hats off to you sir.
We need more of this on here. Hats off to you sir.
Rahz
Well-Known Member
That last test was with no fan. The thermal compound improved performance by about 2C with that sink. Either way they're all managing to maintain typical temps. Fans will bring temps down into the 30s, though a radial designed for passive cooling probably isn't the best choice for a fan. I haven't tested it with the 25CFM fan. Might be interesting to try and see what happens.
I've been turned down on an $11 offer. I've gotten them for $12. Another poster said they got them for $8. In contrast the block sinks were $9 and $9.75, so the radials could be more or less desirable depending on the price you can successfully bid.
Yes, about 35 watts input to the emitter maybe a bit more, so about 22 watts of heat.
They are pretty smooth. I used several grades of sandpaper finishing with 300 grit.
I've been turned down on an $11 offer. I've gotten them for $12. Another poster said they got them for $8. In contrast the block sinks were $9 and $9.75, so the radials could be more or less desirable depending on the price you can successfully bid.
Yes, about 35 watts input to the emitter maybe a bit more, so about 22 watts of heat.
They are pretty smooth. I used several grades of sandpaper finishing with 300 grit.
beodrone
Active Member
Thanks for performing this test - validates what I was seeing as well.
Thanks Rahz, I missed this. I cant get accurate measurement but can use this a a relative reference if I build anything else.. a 'tron' for myself! (not that it's likely for some time). I'm thinking of adding another cob /radial star to the centre of the this one and blowing air down through it (drawing air through the outer cobs at the same time). I might try 1.05a for that fanned cob. Did notice 100w versions of these, 50mm thick (they appear dis-proportionately expensive..), low current is nice though.
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Rahz
Well-Known Member
Yea the 100 watt versions would probably work well with CXB3070 or V29 @ 1.4A. They are expensive, but still cheaper compared to the radials you can find on digikey that are made for these cobs.
As far as your temps, I'm not sure you're in bad shape. As I noted they do feel quite warm to the touch but the test temps weren't extreme... point being you can't test the back of the block sinks by touch because the fins are in the way. 130F at test point, maybe 120F on the backside, would feel pretty warm, and that 54C reading was from 1.05A so you should be gold.
As far as your temps, I'm not sure you're in bad shape. As I noted they do feel quite warm to the touch but the test temps weren't extreme... point being you can't test the back of the block sinks by touch because the fins are in the way. 130F at test point, maybe 120F on the backside, would feel pretty warm, and that 54C reading was from 1.05A so you should be gold.
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