ReadyNAS 3200 upgrades?

Hello!

I'm new to this group and the new owner of a used READYNAS 3200. It came with eight (8) 2TB drives and old version 4.2.x firmware. I had read in these forums that I could increase the available capacity of the unit by upgrading to OS 6.10.5, which I did with no issues. I have four (4) 4TB drives on order from Amazon to set into the first four spots and am moving the older 2TB to spots 5-12 (removed the old volume already).

But, while I am waiting for the new drives to arrive and after looking through some old tech I had in my workshop, I realized that I might have the opportunity to upgrade the installed CPU and RAM at no additional cost, since I already had the parts.

Here is the current info from the main BIOS screen:

Phoenix cME FirstBIOS Pro
Date 06/24/09

Intel Core 2 Duo E7400 @2.80GHz

Logical CPUs: 2 of 2 enabled
System ROM: E43D - FFFF

Installed memory: 4096 MB
Available to OS: 4096 MB
Used by devices: 2 MB

I have available the following processors:

Intel Core 2 Quad Q6600, 2.40GHz, 8MB L2 cache TDP 105W  (Launch date Q1, 2007)

Intel Core 2 E7500, 2.93GHz, 3MB L2 cache , TDP 65W (Launch date Q1, 2009)

The bus speed for all procs, including the installed one, is 1066 GHz. All procs are also all Socket 775.The TDP of the installed E7400 is 65 W.

I would prefer to use the quad core, for obvious reasons.

The memory installed is Apacer 2GB ECC PC2-6400 CL6 (2 sticks, 4GB total)

The alternate memory I have available is OCZ FATAL1ty 2GB PC2-8500 CL6-7-7, 1066  (4 sticks, 8GB total)

Which of the two other CPUs could be used, without having to update the BIOS?

I understand from reading other posts here, that a BIOS upgrade would now mean I either have to downgrade back to v4.2.x, or work in a SSH shell to do some LINUX stuff to manually install a new BIOS (if one is even available for the device).

I know the OCZ RAM is not ECC, but has slightly better specs than the currently installed memory and I have 8GB of it. Does the memory for the device HAVE to be ECC? It is not being used in a corporate environment, just in my private lab for storage and learning opportunities. I will also be running the Plex server add-on and perhaps want to take advantage of it's transcoding capabilities.

Also, how does one find out if they have a v1 or v2 level device?

Thank you for any help, as it will be much appreciated.