As far as i know C600 chipset does not provide SAS support. C606 which is found on x79-up5 provides it. But also i found this:
SourceSo in short then, the X79 chipset supports SAS but Intel decided to remove it at a software level and instead made it an exclusive feature of the more expensive C606/608 server orientated chipsets. With ECS appearing to be the only motherboard manufacturer ballsy enough to re-enable SAS support, no other X79 board would feature more than six SATA ports without a third party controller.
That was until Gigabyte decided to take a different approach by adopting the C606 chipset in favor of the X79, creating the first certified LGA2011 motherboard to include the C606 chipset at X79 pricing.
ECS claim to have enabled SAS on one of their motherboards, and I asked myself how is this possible, then i found this diagram for C600 chipset on intel site:
Which clearly show that C600 chipset have 4 SAS enabled ports. Which means that if there is only software based lock and it is removed every x79 board can enable SAS. But i think manifacturers disable it in hardware in most cases.