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- Change the E5-2640 to E5-2690.
- Increase RAM to 8 x 8 GB to profit from the quad memory architecture.
- You can save money (needed for the 2690's) by lowering SSD capacity to 128 GB or there abouts. 512 GB is a waste of space and money.
- Check those disks. If they are Velociraptors, are are better off with large capacity 7200 disks. If they are SCSI disks, you are better off with 15K models.
- Don't know about the SAS controller, but it looks like just a simple backplane, not a raid controller and the one one the mobo is pretty slow.
- Get a big tower. That Celsius R920 is only a mid-tower and will cause heat problems with all those disks, being filled to the rim.
I suggest a case like this, with some expansion room for the future:
These remarks are solely based on your specs. I really think you can get much better BFTB by looking at a DIY build with an i7-3930K and overclock it.
Mind you, the E5-2690 is over $ 2 K apiece, an i7-3930K is around $ 500, the dual CPU mobo is way more expensive than a simple X79 mobo, the ECC memory is way harder to get and more expensive.
FYI, I'm looking at the case above for my new system, possibly with two PSU's.
The SAS controller is a simple SAS controller based on the LSI 2008 chip
"D2607 SAS/SATA RAID controller The Fujitsu D2607 SAS/SATA RAID controller, based on the LSI SAS2008, offers small businesses exactly the low-cost data safety unit which they have been looking for. The D2607 enables increased read/write performance thanks to its RAID 0, 1 and 10 implementation".