good design but still dead spot in the middle...
so far, the best design for blowing down config is still Xp-90C

okay, regarding of what i've said earlier......

do you see the \ | / bone shape like on the fins ?

it helps to narrow the air to the bottom of the base.

heatpipe does not have heat capacity, meaning it cannot store heat, so no matter how many heatpipes you use (unless it's the space technology 2-way flow heatpipe), the base will remain hot as usual, hence with the fins which are all connected from the base to the top, the heat can radiate through the fins and heatpipes effectively.

from the usual 92mm motor diameter size, the air can still push down to the base effectively cooling the base of the heatsink....

i would think that XP-120 with (5 heatpipes) is the best provided if they come out with a copper version....but it's not available anyway

Tower heatsinks like Scythe Ninja and Infinity can be greatly improved if there's also active cooling at the bottom.....



This post has been edited by AllnGap: Dec 10 2006, 11:06 AM

i was just trying to make sure that the link from the pic is working....


those people who has got tower heatsinks like Scythe Ninja/Infinity can try this :

put a blower blowing the base of the heatsink, you'll definitely see a temperature drop from there...

there are two criteria in heatsinks.....cooling the main heat radiation fins and cooling the source of the heat.....if both can be done, then you'll get very low temperature

This post has been edited by AllnGap: Dec 10 2006, 11:13 AM

not top ler....it's the bottom lerr....

you see the heatsink screwed to the base ?
i mean that part......cooling that part will lower the lowest temperature you can achieve with putting a fan to blow the fins connected to the heatpipe....

and the XP-90C works better coz it's all connected and the fan can cool that part effectively

soldered fins to the base = more heat capacity = more heat dissipation
more heatpipe = more heat convection

if you can somehow join those fins and heatpipe together, then it will work even better..

the dead spot for XP-90C is eliminated by the \ | / that narrows down the air from the fan to the base


ttp://www.octech.jp/uploads/photos/572.jpg


observe the diameter of the motor and the base of the heatsink.....
if the diameter of the motor is a dead spot, then how would the air be able to blow downwards and cool it ?

err, this is also a mystery i've trying to solve......

but there are several factors to consider

- number of heatpipes
- the ratings of the heatpipes (rated in how much heat/Watt per sec i think)
- heatpipe orientation (heatpipe works better in vertical/ against gravity position)
- fins on the heatpipes (like the "8" shapes heatpipes on the Zalman 9500)
- utilised front and end heatpipes as the source of convection of heat (like in Zalman 9500, 3 heatpipes, but the fronts and ends are soldered to the sourse)


so far, AFAIK, Thermalright/Thermaltake/Zalman/CM dare not to post the ratings of the heatpipes that they used, coz the good ones are not that cheap to be used on heatsinks

aiya........looks like i've got to do some photoshop to show what's going on

it will improve the temperature, but to what extend, i seriously dont know........

i've tested a very compact cooler with just 3 heatpipes using a 60mm delta focus flow....that thing performed so well although of it's size because it's a tower design and the base has fins and the fan is able to blow the base heatsink and the fins....

not totally outside, the XP-90C bottom fins are wider and has got a \ | / bone structure that helps to narrow down the air to the base.......

______________
\ /
\ /
\ /
\ /
\ ___/