If your Synology has a removable CPU socket, I would recommend changing the CPU to a faster and energy efficient counterpart. Due to the age of the server you could source a much faster CPU cheaply from auction website such as eBay. For this model the Synology RackStation RS3412xs and RS3412RPxs has an Intel i3-2100 that uses a LGA1155 socket, please note that LGA1155 socket support Sandy Bridge and Ivy Bridge.
Do not attempt to change architect, this is solely that Synology decided not to update the firmware of their chipset to include Ivy Bridge CPU. How did I know? I’ve tried an Intel Xeon E3-1230 v2, does not boot.
Please note that the Intel i3-2100 are pre-installed in the DiskStation DS3611xs, DiskStation DS3612xs, RackStation RS3411xs, RackStation RS3411RPxs, RackStation RS3412xs, RackStation RS3412RPxs all have the replaceable CPU LGA1155 socket, though your disassembly instructions may differ.
For this model you can try any Sandy Bridge, but there is a catch any i5 or i7 CPU does not have the ability to use ECC DDR RAMS. Intel did this on purpose to avoid consumer product to be used in Server product as we all know that consumer is always cheaper than server counterparts such as Xeon. But if you decide that you cannot source an Xeon then the i5 or i7 would have trouble restarting, it can only shutdown and turn on correctly. Makes updating awkward as you need to do a hard shutdown and restart if you wish to continue using an non-Neon.
When upgrading the CPU ensure that you follow similar TDP, the Intel i3-2100 specification is 65 W. This guild-line is the heat output, if you want a different CPU with higher TDP I would recommend that you change the heatsink to handle the heat demand. What happen if you don’t change the heatsink? You will encounter hard-shutdown (temperature sensor activated) when ever you hit the thermal limit of the CPU, running transcoding on the CPU would instantly reach it limits within minutes.
What I recommend is the Intel Xeon E3-1260L, for the lower TDP, double threads, double power, and lower energy usage.
Start off by removing the top panel of the case by removing the 2 screws located on the back, you then slide it towards the edge and lift the panel off.
The location of the CPU is right below the supporting bar, you may wish to remove this if you have difficulty in removing the heatsink. I left it on as this bar can remind you how to position the heatsink back.
Simply unscrew the 4 screws from each corner of the heatsink with a crosshead screwdriver. Carefully remove the heatsink, you will notice that the heatsink is not symmetrical due to the supporting bar Synology decided to get it trimmed on one side.
Insert the CPU back in, ensure that you put on thermal paste using any technique (pea drop or cover the whole top with a thin layer). Now reverse the installation, put heatsink back (note: supporting bar need to fit) and slide the panel back on.
The CPU is faster in single and multi usage, and the AES built-in instructions in the Xeon blast the i3 away. The performance is noticeable faster and with the lower power usage you can slowly regain the money spent on the CPU.
Be aware that the control panel will show the incorrect CPU model in the basic information, Synology has hard-coded the CPU text within the firmware.