T5120 cable management arm and exhaust air flow obstruction

Hello Folks
Concerning Sun servers of 1-U in height... There is debate as to whether the effectiveness of heat transfer out of the chassis is actually impaired by the use of a cable management arm at the rear of a rack mounted server.
From my experience I see this as more of an issue with I-U servers rather than those of 2-U or higher, where enough of the air exhaust flows over the cable management arm.
We have a fair variety of server models, including a T5220 and 14 T5120's. We have used the supplied cable management arm on the T5220 and two T5120's. I notice that the surface temperature of the cable management arm on the T5120's that faces the exhaust is quite hot to the touch, (I'm guessing over 60 C). The metal of the cable management arm conducts the heat and the insulation of the cables does not seem to be effected. However the heat content in the exhaust seems high enough to keep the surface temperature of the cable management arm fairly hot, and much of that heat does not dissipate well into the frame of the rack as there is a mix of materials, metal with insulators like plastic, paint, and air.
Although this type of cable management arm is supplied with the T5120, I am thinking that its use for these 1-U models of servers may be detrimental. The cable management arm was installed in accordance to the instructions in the Sun SPARC Enterprise T5120 and T5220 Servers Installation Guide, doc 820-2178-12 July 2009, Revision A.
The "Sun SPARC Enterprise T5120 and T5220 Servers Site Planning Guide", doc 820-2177-12 July 2009, Revision A, states Allow a minimum of 5 mm (0.2 in) clearance at the front of the system and 80 mm (3.1 in) at the rear of the server when mounted. However the installed cable management arm reduces the rear clearance by about one half.
The focus is to remove heat from the server, whether that is achieved via conduction or convection. Conduction does not seem too effective in this case. Convection of exhaust air flow is obstructed. The Site Planning Guide also does state Manage cables to minimize interfering with the server exhaust vent., which may lead one to deduce not to use the cable management arm at all and route the cables straight out.
What do you folks out there prefer? Why would Sun even supply these cable management arms with these 1-U servers?
Cheers, Roger

Good one, John! Been waiting for your impressions for a while now...
We seem to share the overall opinion about the 180; it's ok, but could definately be improved upon!
My major concern right now is NOISE. Tried the Zalman Fan Mate to quiet the intake fan for the HS, but that seems to affect the CPU-fan as PC Alert reports it as running at 0 rpm from time to time, even though I'm sure it doesn't. And a few days ago the intake fan got a lot noisier than it was from the start, so it's probably giving up the ghost already
Currently awaiting a Papst 60x60x15 to replace it with, hopefully that'll fix the noise problem too!
Noticed your recommendations as to placing quiet fans on the inside of the chassis, and although that is a nice idea it could be difficult on the Mega considering the side panels and top panel are one piece of metal. Could actually be difficult to put the cover back on! If you try something in the way of replacing the HS and/or fans you're more than welcome to share your experiences in this forum!
The few of us who are still clinging to our Mega 180's will need all the help we can give each other, since official support from MSI seems to be held at a minimum...
Cheers!

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