The Precision T7600 parts page shows the following SATA3, 2.5'", 7mm SSD so we know that they are supported as boot drives =

KTM9M 256GB Micron

HHCWG 512GB Liteon M3S-M
2XFM1 512GB Liteon M6S-T
HN71H 512GB Liteon M9S
3YYV3 256GB Liteon L9S
DFVVG 256GB LiteOn Vangogh
X9HG1 256GB Liteon Vangogh
WKFTG 256GB LiteOn Vangogh
XFJWX 256GB Liteon M6S 
W18WD 128GB Liteon Vangogh

P4GHK 512GB Samsung SM841
V622H 256GB Samsung PM830
YRK2P 256GB Samsung SM841N
FFKNK 256GB Samsung PM841

Not sure about the two you listed though.

Thank you very much for your response..

Yes indeed SATA III is supported (Although dedicated to optical drives, while HDD drives are SATA II.. Don't understand why???)

But the models I'm asking about are NVMe PCIe 3 x4 drives (one with adapter, the other without..) So they're not using SATA, and they need NVMe, and I don't know if that's supported in the T7600 bios or not, and if the drives will actually succeed to be boot drives..

The documentation says the Bios can be either legacy or UEFI (the latter is requred for NVMe) but doesn't specifically say any thing about NVMe being supported or not..

Unknown. This system is from 2012 and I do not see any notes about NVMe on its internal documentation.

Thank you very much for all your effort, I really appreciate it..

I'll have to wait and see if someone has a more definitive answer..

Nothing built in 2012 will have NVMe support.

You CAN use an NVMe drive but will need to install it in a PCI slot.

Short answer is No and there are no UEFI NVME Bios settings. You also do not have PCI-E 3.0 bus.

Thank you for your responce @SpeedStep,

According to the spec sheet - he model supports PCIe III:

, and regarding UEFI this is a quote from the "users Guide of the T7600 - page 48:

Thank you for your response @ejn36 , Yes - I realize that I need to Use PCIe slots, the SSDs I asked about one of them uses the PCIe directly (the Intel 770), and the other (950 pro) needs an adaptor..

I know that the drives can be used, the question was more about whether or not they can used as Boot Drives..

It is possible to have Class 1 or Class 2.0  UEFI.   Class 2.3.1  or 3 UEFI isnt the same. The INTEL C600 Series Chipset does not support DUAL X16 slots AND NVME PCI-E 3.0.  You do not have INTEL97,99, 100 Series Chipset and therefore the answer is No you don't have it and No you never will.

http://www.intel.com/content/www/us/en/support/solid-state-drives/000005967.html

Using an NVMe device to boot a computer system requires the following:

• A system BIOS configured to enable uEFI* version 2.3.1 and support NVMe boot
• A system based on an Intel® Z97 or X99 Chipset
• A 64-bit operating system that supports UEFI 2.3.1  Windows* 7, 8 or 8.1
• For Windows 7, the CSM in the system BIOS might need to be set
• The Intel® NVMe driver