Need some cooling advice - Xeon e5, 40TB & 10gbe....

[VtLgsr245]

Recently upgraded my file server and am having some trouble with PCI card temps.

Its built an old cooler master Stacker case which has served me well for the last ten years and I wonder if its time to look to upgrade or if another fan in the right place could help?
The system is used in a small office so its important its quiet, doesn't have to be silent but 10k fans won't cut it.

Case fan is a Noctua NF-S12A PWN
CPU fan is a Noctua NF-F12 PWM
PSU is a Seasonic G550
Three Supermicro 5in3 cages are each fitted with Noctua B9-PWM fans running at 1600rpm, no voltage reducers etc.
The top case fan is not connected
The sides are covered to prevent disruption to air flow so what goes in the front via the hard disks, exists the rear. Covering the sides dropped case temps by 5 degrees so it was an effective mod.

The rest of the kit is Xeon e5-1620, 2 * LSI 9211-8i, Intel x520, 32GB RAM and there are ten 4TB WD RED hard disks occupying the bottom two drive cages. The top one is empty currently but the fan is running to draw some cool air in. Drives idle at 29degC and loaded run below 37degC.

Intel 520 is reading 58.5degC via thermocouple placed between die and heatsink.
LSI 9211's are of a similar temp.

Question for the experts: How can I reduce the temps of the PCI cards?
More fans? Less fans? Better case?

Here's a pic of the case layout so you can get an idea for how air moves through it. Any feedback appreciated.

and a close up of the PCI area

 

[VtLgsr245]

Further googling suggested I tried this ghetto mount with the old fan from the CPU cooler....dropped temps by 10 degrees to 45.5degC now. Still interested to hear if theres anything else I can do to improve upon this?

 

[rhansen5_99]

Have you considered using pcie ribbon cables to try to spread out your cards? I used these in a mining rig and they worked pretty well. If you can get some space between the cards the ambient temp should decrease a little and that fan will help a lot more. Something like 2 of these http://www.ebay.com/itm/New-PCI-Exp...099?pt=LH_DefaultDomain_0&hash=item3a95ed50eb might do the trick