Summary: We now have a dozen of these cards on FreeBSD and Linux hosts and no problems whatsoever. They work without any configuration, including PXE booting. CX4 media are so much easier than DACs and seem to be well standardized (unlike DACs).
Pros: I reviewed this once before and liked almost everything.
Cons: None - recent purchases of this card have no difficulty with PXE booting which the earliest card would not do. That failing subtracted 4 stars from my rating at the time.
Summary: Used these for a cheap 10GbE mini network. Directly connected 2 computers with these cards using a Cat 7 cable (no router/switch). Can open and copy files between these 2 computers at fantastic speeds (SSD to SSD). 10GbE Network co-exists with the existing 1Gb network.
Summary: Simply AMAZING!!! I'm backing up between two PCs with RAID arrays with spindle drives. I'm averaging about 500MB/s on average. Large files - 1GB transfer 600MB/s. Lager transfer at 900GB/s. Tiny files are still slow - about 30MB/s.
Summary: I sure like the idea of CX4 because of the terrific cost saving - the cables cost $20 rather than $1,000 (FO) or $200 (DAC) and the Netgear switch is $100 per port rather than $1000. But try as I might I can't get PXE booting turned on.
Pros: Uses inexpensive Cat 7 cables, connects to inexpensive Netgear switch, may work with no configuration, can be used with slower switches if necessary unlike traditional 10GBE equipment.
Pros: There are no real gotcha's with this card. It installs as easily as any other PCIe card. It is compatible with NAS4Free and I will be testing it with VMWare's ESXi also.
Cons: Despite the inference on Intel's website, this card is NOT compatible with Mac OS X. Intel has drivers for every other platform (Linux, FreeBSD, Windows, etc), but NOT for the Mac. The Intel website states that SmallTree maintains Mac drivers for this card - But, it doesn't say that you must buy ...