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post #11 of 38
I'm not 100% sure, but don't the mainstream heatsinks have some sort of liquid inside the pipes that boils when in contact with the base and carries the heat upwards towards the fins?

Are we sure that liquid won't freeze at the -17C temps and therefore nullify the cooling ability of said heatsink? Hell; it may even burst the pipes on it.


I'm all for seeing this done, but I'll tell you this one thing: The gains you'll have from taking your 955BE from normal temps to -17C will not really make that much difference in speeds/points.
Deneb chips scale better as they get colder, but -17C in the room will not mean that the actual core is at that temperature unless you leave the system in there for an hour or so to bring the temps down... And even then; once you power up... The core will warm up quickly. Yes; you'll be running colder than you would if you were in a regular room rather than a freezer, but not colder enough to get you a "sizeable" increase in achieved speeds/points.

I would really suggest you consider this: Start subzero cooling for under $200
You mentioned the part about being broke; so maybe start putting a few bucks away every week until you have enough.

Other than that... One more thing you could do is try to find a cheap/used CPU Block, a couple of barbs, some tubing, a cheap pump, a styrofoam cooler and some dry ice. Run a loop with a mix of water + Ethylene Glycol (Antifreeze) and cool your cpu to way below ambient that way. It will still cost you some money, but I'm sure you could find all the needed parts for $100 if you looked hard enough.
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post #12 of 38
Thread Starter 
Quote:
Originally Posted by applesaucesandwich View Post
Someone is selling that fan here if you didn't see.
Ah, I hadn't seen that, thanks. But for $5 I'll just buy it new.

Quote:
Originally Posted by eskamobob1 View Post
Couple of problems here... Your results from a 100CFM fan to a 250 CFM fan won't change at all... The problem you are going to run into is that there will be a point where the heat being transferred from the block to the fins will be the limiting factor in ur temps... If you are going for extreme cooling, then make ur own heat sink with high fpi and like 12 heat pipes... The best cooler to use won't be the best one at regular fan speeds... Look for a cooler with a ton of heat pipes and high fpi (idk with one would be best as I usually water cool)... With even coolers such as the nh-d14 or silver arrow, you wold max heat transfer at around 150CFM or so... If u want extremely low temps, the get a cheap pump, a block and a 120.1 black ice rad and you will probably hit close to ambient temps with one of those fans... Whole setup should run u like $150 or so
Yeah, I'm aware of that, however, because people who make heatsinks optimize them for everyday use, they all use ~2mm spacing, and mostly .4mm thick fins. And going WC would defeat the purpose of going for extreme air cooling.

Quote:
Originally Posted by inVain View Post
forget that sipre crap!!!!
get yourself an TR-silver arrow and put three of that PFBs on it

and I'll suggest you to take the 4 wire (PWM) version instead of the three wire,
or just search the Delta PFC1212DE, it has the same blade design of that PFB
but with more power (4.8A each )
That IS the fan I was planning to use lol

Quote:
Originally Posted by xXSebaSXx View Post
I'm not 100% sure, but don't the mainstream heatsinks have some sort of liquid inside the pipes that boils when in contact with the base and carries the heat upwards towards the fins?

Are we sure that liquid won't freeze at the -17C temps and therefore nullify the cooling ability of said heatsink? Hell; it may even burst the pipes on it.


I'm all for seeing this done, but I'll tell you this one thing: The gains you'll have from taking your 955BE from normal temps to -17C will not really make that much difference in speeds/points.
Deneb chips scale better as they get colder, but -17C in the room will not mean that the actual core is at that temperature unless you leave the system in there for an hour or so to bring the temps down... And even then; once you power up... The core will warm up quickly. Yes; you'll be running colder than you would if you were in a regular room rather than a freezer, but not colder enough to get you a "sizeable" increase in achieved speeds/points.

I would really suggest you consider this: Start subzero cooling for under $200
You mentioned the part about being broke; so maybe start putting a few bucks away every week until you have enough.

Other than that... One more thing you could do is try to find a cheap/used CPU Block, a couple of barbs, some tubing, a cheap pump, a styrofoam cooler and some dry ice. Run a loop with a mix of water + Ethylene Glycol (Antifreeze) and cool your cpu to way below ambient that way. It will still cost you some money, but I'm sure you could find all the needed parts for $100 if you looked hard enough.
Yes, they do, they're called heatpipes(liquid gets heated at the bottom, vaporises, rises, condenses, flows back to bottom, repeat).

No, I'm not sure that it won't freeze... guess I'll find out lol. may result in a real short session. dw though, I'll be watching my temps like a hawk.

Yes, I'm aware that the gains won't be very large. Maybe negligible, maybe not even measurable. It is my understanding that the real gains are to be achieved after reaching superconductivity, which is colder than air can take you. I don't really know what temperature that is, but I would guess it's at least -70C, given that DICE typically gives significant margins over water/air, but LN2 does still better, and LHe does very marginally better than LN2.

Yeah, I could get started with DICE now (thanks to a really good finish in an MTT) but then I'd be competing with other people using DICE, and my whole goal is to excel in an area, not just choose a more effective area and be mediocre with it. But DW, eventually I'll get the gear and go for the big kid stuff

Chilled water is on the to-do list as well.
post #13 of 38
this fan has much more power:

Delta GFB1212VHW
120mm x 120mm x 76mm
49,95 US $
374m³/h
59 db/a
2,65 Ampere (31,80W)
3550 U/min push-, and 3250 U/min pull

this is a monster, 2 fans, one with 5 blades and one with 3 blades, running in different directions (bad grammar, cant explain properly, sorry)




all infos and tests here, use google chrome to translate the whole site:
http://www.exclaim.de/artikel/berich...hte-Kerle.html
Edited by justanewguy - 10/29/11 at 12:25am
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post #14 of 38
dang, I do envy you....

are those dual propelled Deltas were easy to find in Germany?
coz I can't find any, here in my country
post #15 of 38
apparently not, i would need to import them like the guy in the test did it.
so around 50-60 bucks + shipping costs and due to the reason that they only produced ~200 pcs of it, it will be hard to get your hands on one of them.
i would love to test one, they are loud as hell but pushing air like nothing else
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post #16 of 38
Thread Starter 
post #17 of 38
For thermal paste I would recommend IC Diamond as I have heard great things.
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post #18 of 38
You should also get 40mm fans and put them on the chipsets and mofsets on your motherboard
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post #19 of 38
Thread Starter 
Quote:
Originally Posted by Tronic707x View Post
You should also get 40mm fans and put them on the chipsets and mofsets on your motherboard
Probably not necesary, as ambient temp will by -17C, but I might set up some of my spare 120mm fans
post #20 of 38
Quote:
Originally Posted by Nnimrod View Post
Probably not necesary, as ambient temp will by -17C, but I might set up some of my spare 120mm fans
Honestly, the heatsink you use won't matter much when the ambient temp is -17C.
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