Thanks for that was considering trying it, does it matter if I use
a cpu fan header or a chassis fan header?
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- Thread starter rjk
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Thanks for that was considering trying it, does it matter if I use
a cpu fan header or a chassis fan header?
Use the cpu header and set the bios to Voltage if your using the fans that came with the H100i. If your bios does not support voltage control the fans will run at %100.
In this poker game my money is on the 35% bigger cooler making more difference than fan flow rate. I'm betting less airflow will be trumped by 35% bigger radiator.
I understand the pre-order vs in stock argument. I think of pre-ordering as buying before it's in retailer's hands. Like a new sports car that will never be in the showroom because they are all sold before they leave the factory because people thing they will be faster/better than any already in the showroom
Yeah I hear what you say and having a ~30% larger rad is a big bonus however the higher flow rate and ability to get the heat off the rad faster will also make an impact. All the bigger rad means is that it can store more heat while waiting for the fans to clear it, its a buffer and unless its saturated its not really an issue, if they were both using the same fans the advantage would go to the X60 no question and it could even lower the speed while maintaining an advantage, but as the h100i has better fans they do have the potential to level the playing field.
A radiators(as name implies) are designed to radiate energy (hot or cold) energy and not to store energy. The bigger the radiator the more tube area and surface area it has and the more heat it can radiate.
More air movement through radiator means more heat can be radiated.
CFM
H100i has 2x 77cfm fans so a total of 154cfm maximum flow
Kraken is 2x 98.3cfm fans so total of 197.6 cfm max.
Static pressure
H100i is 4mm H2O
X60 has 2.2 mm-H2O
Less static pressure but still respectable amount.
I can't find any specs of radiator core/fin density or airflow resistance.
I'm guessing the difference between airflow and static pressure will end up with about the same air coming out of respective radiators. If that is the case than the difference ends up being the X60's 35% bigger radiator.
But even if the X60 ends up with 20% less air coming out it will still end up cooling better because radiator is 35% bigger... at least that's my guess
And it's all guessing until both cooler are tested side by side.
Soldato
A radiators(as name implies) are designed to radiate energy (hot or cold) energy and not to store energy. The bigger the radiator the more tube area and surface area it has and the more heat it can radiate.
More air movement through radiator means more heat can be radiated.
CFM
H100i has 2x 77cfm fans so a total of 154cfm maximum flow
Kraken is 2x 98.3cfm fans so total of 197.6 cfm max.
Static pressure
H100i is 4mm H2O
X60 has 2.2 mm-H2O
Less static pressure but still respectable amount.
I can't find any specs of radiator core/fin density or airflow resistance.
I'm guessing the difference between airflow and static pressure will end up with about the same air coming out of respective radiators. If that is the case than the difference ends up being the X60's 35% bigger radiator.
But even if the X60 ends up with 20% less air coming out it will still end up cooling better because radiator is 35% bigger... at least that's my guess
And it's all guessing until both cooler are tested side by side.
The resistance of the air flow through the radiator will impede the CFM through the radiator and so static pressure is important in this case. The Kraken fans may well have higher airflow without the radiator in front, but measure the airflow coming out the other side of the radiator and i'm certain it will be higher for the Corsair. I think it will shift around 40% more air through it. If I convert those value to horsepower the Corsair fan setup has 0.1 hp and the Kraken 0.07 hp.
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Too true. I guess you missed this in my post.. even though you quoted it.
Soldato
I guess you missed this in my post.. even though you quoted it.
The Corsair will have about 40% more air going through it. So a 35% bigger radiator (and this also assumes the surface area is 35% bigger) then the Corsair has an advantage.
Please explain how you get 40% more air? What data are you using to determine airflow resistance of the H100i and X60 radiators?
The static pressure and cfm specs for the fans are ambiguous at best. I can find no data showing static pressure at specific cfm or cfm at a specific static pressure.
Any links to data are greatly appreciated.
Soldato
Please explain how you get 40% more air? What data are you using to determine airflow resistance of the H100i and X60 radiators?
The static pressure and cfm specs for the fans are ambiguous at best. I can find no data showing static pressure at specific cfm or cfm at a specific static pressure.
Any links to data are greatly appreciated.
I've already quoted the horsepower of the fan. As soon as that fan is pushing the air through that radiator then that is what counts. Arguably the larger radiator of the Kraken will cause even more airflow losses because it is bigger. As I said before, it is a factor of many things not just one. I can just normalise the radiator resistance for each. I did not even factor in the larger resistance of the Kraken radiator, which would perhaps widen the gap between them further.
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By my calcs it comes out to roughly 131% the size of the H100i's radiator (138.4*27.0*312.5mm vs 120*275*27mm).
I can find no data showing static pressure at specific cfm or cfm at a specific static pressure.
That's because they don't link together like that, I.E a 80cm fan and a 120mm fan at the same cfm will have different pressure values, even 120mm fans at the same cfm will. This is why some fans work better for case intake/exhaust and some work better on rads, cfm is more relevant to case fans and pressure more important for rad fans.
Area of radiator core is cooling area, not area of radiator with manifolds on each end.. and adding thinkness changes it to volume, not area.
No data means guessing with nothing to back it up. I'm trying to find some data on which we can make educated guesses.
Every fan has different specs affected by power, blade design, rpm etc.
Soldato
Surely the point of having a larger radiator is to have a larger surface area. I.e. If you boost the length of the radiator by 10% then the surface area increases by the same amount.
Horsepower is part of it. but so are blade design and other things.
Fair enough. Both radiators are probably very similar except for size so similar resistance.
No, I don't think we can say just because it is larger it has more resistance. We can assume resistance per sq. cm. is the same but that is what resistance is. We can't put 140mm fans on a 120x240mm radiator, and 120mm fans on a 140x280mm radiator move air through same basic area they do on the 120x240mm radiator.
You are saying Corsair's 77cfm & 4mm will flow 40% more air than Kraken's 98.3cfm & 2.2mm. I would like to know how you are coming up with this.
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Exactly. But the manifolds on each end of radiator are not part of the radiator's surface area.
Think of it this way;
Radiator radiates energy.
Manifold directs water evenly into radiator.
Only the area with fins is actual radiator/radiating area.
Think of the manifold as extensions of the hoses/pipe moving coolant to radiator.
The thickness of radiator does come into play along with the number of tubes per core and the number cores. Thinker radiators often have a second layer of cores.
It's simple bigger radiator needs a bigger pump to maintain pressure and overcome losses. If the Kraken has a bigger radiator and more powerfull pump with decent fans it will be better.
I doubt there will be much between them my half knackered H100i can keep my i5 clocked to 4.8ghz under 70.c so it has an easy lead to follow.
I doubt there will be much between them my half knackered H100i can keep my i5 clocked to 4.8ghz under 70.c so it has an easy lead to follow.
Soldato
Exactly. But the manifolds on each end of radiator are not part of the radiator's surface area.
Think of it this way;
Radiator radiates energy.
Manifold directs water evenly into radiator.
Only the area with fins is actual radiator/radiating area.
Think of the manifold as extensions of the hoses/pipe moving coolant to radiator.
The thickness of radiator does come into play along with the number of tubes per core and the number cores. Thinker radiators often have a second layer of cores.
If the radiator is lengthened by 10% then the fins are lengthened by 10%.
Regardless, the larger radiator causes more losses so the 40% more air flow through the Corsair is likely larger and this is already greater than the 35% larger radiator the Kraken has.
I think it is best to wait for benchmarks. On paper the Corsair has it.
Yes, 10% is 10%. But that 10% is of actual radiating surface of cooler and not the manifolds on the ends of the radiating surface. Physical area of cooler is not the same as physical area of radiating area.
Again, how are you coming up with this 40% figure? I don't think you are just spouting number. If I thought that I wouldn't even bother to ask.
Soldato
Horsepower is the work per second being done on the air. The corsair fan has more horsepower. This gives it the better air flow through the radiator. Have you also considered the larger radiator means the water flow is lower too?