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CNPS9500 VS Big Typhoon

lopri

lopri

Elite Member
I've been reading through quite a few reviews regarding these two new cooling products. General consensus seems to be more favorable towards the Big Typhoon, and I think it's reasonable.

http://www.xbitlabs.com/articles/coolers/display/4-cool-comp.html
http://www.xtremesystems.org/forums/showthread.php?t=74479 (56K You're warned)

However, I also found this user claiming a big gain using CNPS9500. While he wasn't exactly using the Big Typhoon (he was using XP-120 I belive), there was this thing that got me to believe his claim also.

http://www.hardforum.com/showthread.php?t=915323&page=6 (Scroll down to middle)

This guy has a same mobo/case combo as mine: A8N-SLI and Lian-Li V1000
If you look at the pics from the HardOCP user, you will notice that there is very little room between the HSF and the aluminum panel which isolates the PSU from the rest of the system.

So, here is my reasoning. Most reviews comparing HSFs are done using more conventional type of cases. I.E. 2 Fan-PSU on top sucking some air from the fan blowing down the HSF, as well as some more room for air between the HSF and the other parts.

In the case of Lian-Li V1000, the case design allows almost no room between HSF and the PSU, therefore possibly pushing the warm air (which was blown down by the fan) back towars CPU/HSF area. On the other hand, with the CNPS9500 the air flow is more seamless from front to the end.

OK, so now I have a Lian-Li V1000 housing my A8N-SLI Premium. Which cooler you think I should go for? CNPS9500 or Big Typhoon? Should I trust the general consensus? Or should I consider my specific case? I really need your input.

Thanks in advance.

lop
 
McArra, did you check out the pics at the HardOCP? I'm not disagreeing the Big Typhoon would suit better in most cases, but talking about a case where room between HSF and case is extremely thin.
 
That CPU has a Maximum Thermal Power of 89W in its stock-clock setting.

I see an Idle-Load difference of 24C at the extreme, with the maximum CFMs through the fins. The processor, I think -- because I'm not yet an AMD expert -- has its VCORE over-volted to 1.7V, and of course it's over-clocked. I would think the Maximum Thermal Power would be greater than 89W under those conditions.

So the minimum thermal resistance of the CNPS, according to this review and aside from my earlier estimate of 0.158 C/W, fits this inequality:

TRmin[CNPS9500] <= 24C / 89W = 0.27 C/W

If the thermal leakage actually equals 100 watts or 110 watts respectively, then:

TRmin[CNPS9500] = 24C / 100W = 0.24 C/W

or

TRmin[CNPS9500] = 24C/110W = 0.22 C/W

These tests were performed with the CASE OPEN!!! And the room ambient was measured carefully at 21C or approximately 70F.

Under these conditions, this test not only falls far short of either my calculation of the cooler's performance, or far short of another review. It may be that I read the wrong "Maximum" power leakage figure from AMD, but this is an Athlon 64 3000+. If the thermal wattage was 120W, the thermal resistance at "high" fan-rpms would still be 0.20 C/W. But those figures are worse than either the CNPS-7700-Cu, or at least partially the CNPS-7000-Cu.

And the results are way outside the range of water-cooling, which Zalman suggests the unit is designed to match.

I'd rather cling to my thermal resistance value estimate of 0.158 C/W -- still worse than that of the SI-120 by ThermalRight. I give my jaundiced eye to the review.

Draw your own conclusions.
 
Originally posted by: lopri
McArra, did you check out the pics at the HardOCP? I'm not disagreeing the Big Typhoon would suit better in most cases, but talking about a case where room between HSF and case is extremely thin.
Click to expand...

That might be a problem, but the heatsink measures must be in TT official page, so you may measure yours and see if it fits 😀
 
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