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Need advice on a CPU & Case Fan

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Hello guys!

This week I started to push my 2500k a bit further than the old 4.2GHz OC and saw some issues with the temps, especially with the case closed.
I am stable at 4.5GHz with C states enabled and offset voltage at 1.3v under load.

With the side window removed the CPU cores bounce between 70ºC and 75ºC under IBT custom with 7GB and between 64ºC and 67ºC under prime95 Blend custom with 7GB also.
Idle temps are around 24ºC.

With the last 4.2GHz OC @ 1.216v my temps while folding were averaging 55ºC closed case and 49ºC open case. So with this new OC I fear the temps might go into the high 60s low 70s closed case, a no go scenario for me.

The closed case temps are to blame on the case and fans that are fit into it. The case is a Sharkoon T9 Black Edition and the fans are still the stock ones (one at the top back and 2 at the bottom front).

The CPU cooler is fitted with a Cooler Master R4 90CFM (which some say it's 69CFM instead, which got renamed Sickleflow).

Also to note is the front case filters that help blocking the dust from entering the case (and can be blocking airflow too).
Here is a pic of it:
(sorry for the poor quallity :()



The bottom fans:



So I am looking for some advices to boost my closed case cooling performance (which I believe it starts with the fans).

I think the CPU fan is good, but recommendations are welcome!
Some research has been done in the forums and some options rise:
Noctua NF-P12-1300 - 25$
COOLER MASTER SickleFlow 120 - 10$
ARCTIC F12 PWM - 10$

The Noctua fans are WAAY too EXPENSIVE! I know they are well built and had my readings about it, but I won't be throwing 75€/100€ for 3/4 fans! At that price I should be able to pick another 6870 :confused:
The most tempting option for me is the Arctic fan listed above, which has 74CFM and looks good about pressure and sound levels (mentioned by niko084)

The computer is in my bedroom so I need it as silent as possible while having a good airflow.

Sorry for the big post but just wanted to provide valuable info so you guys can give your thoughts knowing what I'm dealing with.

Thanks in advance!

EDIT:
Here is a pic of the cooler positioning:
 
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When we talk about air cooling, you're always looking for positive pressure...



In the link you placed for the case, i did not see the compatible size for fans at the top (or i'm getting blind already). Already heard that these Noctua fans are great if you don't mind the color scheme.

I'll do some research to help you... =D
 
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When we talk about air cooling, you're always looking for positive pressure...

http://files.tested.com/photos/2013/02/08/55-44527-ss_airflow-1360344073.png

In the link you placed for the case, i did not see the compatible size for fans at the top (or i'm getting blind already). Already heard that these Noctua fans are great if you don't mind the color scheme.

I'll do some research to help you... =D

Thank you for the reply! The case does not have a top fan, just a rear fan and two front fans.
The problem with the Noctua fans really is the price... 75€ for 3 fans is too much IMO.

EDIT: I have posted a pic on how the cooler is currently faced. Is it the best option?
 
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As long as the cooler is mounted correctly, that is the best option.

The intake fans are filtered? This is very important....
 
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As long as the cooler is mounted correctly, that is the best option.

The intake fans are filtered? This is very important....

Yes they are filtered as shown in the fist pic in the main post. Do you think it is blocking airflow?

Also there is a grill behind the fans that might be blocking airflow?

 
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No, that's fine. Filter is important because won't allow dust inside your case. And dust = more heat retention.

You really need some top intake fans. Exhaust only in the rear fan. And fans on the side panel are also beneficial...
 
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Thank you!
When I get some free time I will try to modd the case to allow top fans.
Now I just need to choose which fans to buy.
Any recommendations on a good price/performance fan within a max of 15€? I live in Portugal so the conversion is like 1$ = 1€ because of taxes.

Some that got my attention were:
SCYTHE "SLIP STREAM"
NOISEBLOCKER XL2
ARTIC COOLING F12

The NB XL2 is looking good to me. See this.
 
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Don't waste your money on $10 CM or TT fans, they all suck, no wait a minute, they DON'T suck, or at least not much (air). Try the Corsair AirFlow Series fans, you won't be disappointed.
 
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Mouse A4Tech Bloody V5
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Don't waste your money on $10 CM or TT fans, they all suck, no wait a minute, they DON'T suck, or at least not much (air). Try the Corsair AirFlow Series fans, you won't be disappointed.

Those look great indeed! After you mentioned them I took a look into some reviews and all reviewers gave them a 5 star rating.
The noise on the performance AF120 is very very acceptable for the air they move.
The price is great too! In the corsair site they cost around 15€ if you buy a double fan pack (don't know how much is the shipping though).
I was going to get the NB XL2 but this changed my mind. Thank you very much for the suggestion!
 
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