[John_Toolbox]

Not really anything new, they've had 1, 2, 3, and 4 slot PCI chassis for quite some time, and a PCIe host card (The PEHIFX1) that connects to them... assuming they are new enough to have a compatible chipset for this host card.

The issue has always been that they are not officially supported or tested by AVID for use with Pro Tools cards, so while some people have reported that they worked in their systems, YMMV. My advice is: unless magma says they have tested it with your exact configuration, assume that it won't work. PCI expansion chassis are very finicky about, OS, Pro Tools version, and computer model, it's never as simple as "A PCIe computer will work with a PCIe -> PCI chassis with PCI cards". Throwing a Thunderbolt -> PCie adaptor into the mix makes it even less likely to work.

Assuming your system specs are supported with it, the safest bet is to get the PE6R4-I, which has been tested, and last time I checked, is the only PCIe -> PCI chassis that has ever been officially supported. If you don't plan to use more than an HD3, you should also look at the price of used PCIe HD cards on ebay, the cost isn't that bad anymore, especially if you factor in selling your old PCI HD cards.