We are going to research on this subject and will get back to you as soon as possible.
I would also like to know this for the Intel 530 and 535 SSDs, as I use my SSDs to hold VMDK files for virtual machines inside a USB 3.0 enclosure that does not support Trim.
Garbage collection varies by firmware and is designed to maximize the different hardware architectures. The Intel® SSD 530 Series uses foreground garbage collection, so idle time has a minimal impact.
Here is an external link with more information about garbage collection methods:
*NOTE: This link is being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.
It is worth to mention that Data Center SSD's like the Intel® DC SSD 3500 and Intel® DC SSD 3700 Series are a better choice for server or data center usage, since they are designed for availability, have power loss protection (PLI) for in flight data and have higher write endurance.
The Intel® SSD 530 Series is designed to be used in low power usage systems (laptops, ultrabooks), and has power saving features (DIPM, devsleep) that are not available in some systems.