What i've heard is that the P12 fan pushes about the same air that the S12 does, but it has a lot higher static pressure, making it easier to push air through tight fins(and so keeping the CPU cooler), something that the S12 is missing. By looking at the fan blades it looks very possible, but by reading forumcomments i've heard that the P12 is a dissapointment. Take this for example, a guy som SPCR
who is misshappy with his P12.
Please SPCR, review this fan.
test showed, that P12 beat Scythe Slip Stream in both static pressure and "open air" tests.
When paired with a heatsink, 835 rpm Noctua P12 was 1 celsius better then Scythe Slip Stream @ 800.
And this system was with a Passive Ninja Copper, where fans were used as case fans. See how Noctua outperforms Slip Stream.
And it is the quietest fan of the test of the bunch. You can find similar results from many hardware sites. Clearly Noctua P12 is exceptionally quiet when it comes to objective sound measuring. The only unanswered question is, how does it perform subjectively.
Like they said in the recent SPCR fan test: "While the 1000 and 2000 RPM Ultra Kazes performed well, the measured SPL is deceiving. They sound subjectively worse than any of the other fans in the round-up when registering ~18dBA@1m. The others are more or less inaudible."
This is the only concern left for the P12. This and how they perform around 500 rpm. That's why we need SPCR to test them.
I dont see how the Slipstream is a better fan than Nexus. I've read the review that was recently shown here, noone matches the 'older' top fans?
With Slipstream M i suppose you mean SLIP STREAM SY1225SL12M, It pushes 24CFM @ 18dB(A), is this the old or the new method? In the old method the Nexus pushes 27cfm @ <19dB(A), and in the new method the Nexus pushes 23cfm @ ~19dB(A). And still the Nexus has a nicer sound that is harder to recognize. I know, i have a Slipstream myself on my TRUE. I dont know exactly(how can i find out?) which type it is, but it's supposed to spin 1200rpm maximum, but it actually spins up against 1400rpm at 12v. I can confirm the fact that it sounds like HELL when spinning at 1400 rpm. It may keep the CPU 2-4degrees colder, but it also sounds 10 times the Nexus. But when it spins beneath ~900-1000 rpm it's pretty much inaudible, nothing that disturbs me.
Someone who can explain the Slipstreams?
It's the new method. It sounds like your Slip Stream is the Slip Stream H (SY1225SL12H). It has top rpm of 1460. It was the worst Slip Stream in the test. All Slip Streams
are reviewed here. Here's couple of quotes from the article.
"As for performance, well, it was simply the best. Of all the fans we've tested at approximately 18-19 dBA, none could match the 24 CFM the Slip Stream M pushed, not even our reference Nexus fan."
This is as official as it gets in a Nexus vs Scythe Slip Stream debate. Enough said.
"The 800 RPM Slip Stream L is also formidable, matching the performance of the Nexus fan in our fan test setup, and beating it for airflow and/or cooling when used with the Scythe Ninja Copper."
I think They mentioned somewhere else, that 800rpm Slip Stream beat Nexus by 2 celsius when paired with a Copper Ninja, and both fans were used at the same noise level.
I'd also like to end this up by saying, that it doesn't really matter which fan you choose (Nexus, Slip Stream M or P12). They are all high quality fans with excellent noise signatures. If you build a quiet machine with any of them, you can replace any of the fans with the next and it has no real world performance difference. The only difference it might make are couple of degrees in cpu and gpu load temps, and the truth is, these temp difference have no effect on anything, except on the users mind. Listen people, stop obsessing over temps! It makes no difference whether your cpu load temp is 44c or 46c! If people are able to get past their temperature obsession, they'd be happy with which ever fan they choose.