What is this heat sink for?

[sarcasticphoenix]

The title says it all...
On this Rackable Systems 2U server...





The CPU heat sink was easily found. The memory is to the left and below the CPU...
But what is the last heat sink for? There were ridiculously loud fans blowing air into it, so I removed them.
If the heat sink is for the graphics card, I would not need fans as loud as the ones originally there, hence I am not going to play games or something on a server computer.
So, what is the heat sink for? Also, the two fans originally pumped 24CFM of air each, will 13CFM per fan be enough to cool the heat sink?

[Salmon Trout]

What is the model?

[sarcasticphoenix]

It is this:
http://www.ebay.com/itm/2U-32GB-RAM-SGI-RACKABLE-NAS-STORAGE-SERVER-2X-OPTERON-QUAD-CORE-2352-RAID-2TB-/140696037376

Specs from the description:
Powerfull 2U Rackable Systems (SGI) Compact Half Length NAS Network Attached Storage Server 2x Quad Core AMD Opteron 2352 2.11Ghz/core 32Gb ECC DDR2 RAM Memory 2TB Total Raw Storage (4x 500Gb) SATA 7200rpm Drives

PROCESSORS - 2x AMD Opteron 2352 64Bit Quad Core CPU's
CORES - Total 8 Physical Cores at 2.11Ghz per Core
MEMORY - 32Gb DDR2 ECC Registered RAM
STORAGE - 4x 500Gb SATA 7,200rpm Drives for a Total of 2000Gb (2TB) Raw Storage (Set as Hardware RAID 5 on built-in Motherboard SATA RAID Controller)
RAID - ON board Nvidia Nforce 6-Port SATA Controller (Hardware R0, R1, R10, R5 Capable)
BACKPLANE - 4Port Hot swap SATA with Trays
SYSTEM - Robust Flextronics / Arima Corporation NM46X dual processor Opteron 2nd Generation Multicore Server class Motherboard
IO CONTROLLER - Onboard 1x IDE + 1x Compact Floppy Port
ETHERNET - Integrated 2x Nvidia McP55 Gigabit 10/100/1000 LAN Adapters
VIDEO - Integrated ATI ES1000 16Mb Graphics Adapter
POWER - Rackable Systems Original 450Watt 1U Power Supply
OPTICAL DRIVE - N/A
RACKING - 2U Half Length 19" Rack Mountable Design
DIMENSIONS - 16" Deep, 17 1/2" Wide, 3 1/2" Tall
BRAND - Rackable Systems / SGI
SERVER - Other Onboard Flextronics/Arima NM46X Server Features
PORTS - 4x USB + 1x VGA + 1x Serial 9pin + 2x PS2 (Mouse & Keyboard) + 3x RJ45 (LAN) + 1x RJ45 Console

Item specifics
Condition:   
Seller refurbished: An item that has been restored to working order by the eBay seller or a third party not approved by ... Read more
Form Factor:   2U Rack-Mountable
Number of Drive Bays:   4
Brand:   Rackable Systems (SGI)
Interface:   eSATA   
RAID Levels:   5
Installed Storage Capacity:   2 TB   
Model:   Opteron Quad Core

[Salmon Trout]

could it be a cpu? - the board does have 2, and it looks like the right place

Like this one

[Salmon Trout]

Later

I believe it is CPU 2. Didn't you know there are 2? If I were you I would put those fans back quick! Didn't you read the spec?

2U 32GB RAM SGI RACKABLE NAS STORAGE SERVER 2X OPTERON QUAD CORE 2352 RAID 2TB

In fact from your other posts you already know this.

It looks like an Arima motherboard and here is a pic of one, model NM46X which is a dual Opteron board used in Rackable Systems equipment.

PDF manual

http://www.rioworks.com/Server/Download/Download/NM46X_V097.pdf



board layout

[Salmon Trout]

now follows an embarrassed silence...

[sarcasticphoenix]

Sorry, I was afk.
Thank you for the info. I will probably buy quieter fans for it...
The old fans pumped 24 CFM of air each, so that will be 48 CFM...
Would a pair of quieter fans at 13 CFM each do the job?

[Salmon Trout]

Sorry, I was afk.
Thank you for the info. I will probably buy quieter fans for it...
The old fans pumped 24 CFM of air each, so that will be 48 CFM...
Would a pair of quieter fans at 13 CFM each do the job?

Did you really not know it was a cpu? I am not a server tech, but I imagine half an hour's Googling might tell you some things. Server makers tend to specify for reliability, so if you don't mind it burning up after a while then lesser fans might be OK. Servers are meant to be put in server rooms, and noise is not a design factor. They are not good as home PCs.

[sarcasticphoenix]

Thanks for the encouraging reply.



Anyways, I am not going to give up, so I am probably going to add more than 2 fans and make it add up to the air flow it had before.
And yes, I bought the server to use it as a server, not as a home PC.