![]() I have a 5,1 2009 mac pro, Yosemite 10.10.5, a macvidcards flashed 6GB 980ti, 64GB RAM, pindelski upgrade to 2x 3.46GHz quad core xeon.ġ6x squid in 16x slot with 4x samsung AHCI 512GB sticks in a RAID 0 totalling 2TB.īooting off the RAID 0, running off the RAID 0. ![]() This thread is probably the biggest "community" of squid users. A card supporting only one NVMe drive can only support x4. The switch chip on the amfeltec Gen2 quad card has the advantage of being able to convert PCIe 2.0 x4 to PCIe 1.0 x8 or x16. ![]() You can confirm this using the lspci command.ĥ) The switch chip on the amfeltec Gen3 dual and quad cards has the advantage of being able to convert PCIe 3.0 x4 to PCIe 1.0 x8 or x16 (or PCIe 2.0 x8 or x16 in a compatible slot - of which the Mac Pro's slots are not). The Gen2 card is more compatible, but the NVMe drives drop to Gen2 speed because the switch chip is Gen2. The Gen3 card may drop to Gen1 speed but only for the upstream port of the switch (connected to the PCIe slot) - the NVMe drives are separated from the PCIe slot by the switch and continue to work at Gen3 speed (downstream ports of the switch). ![]() So the PCIe device connected to the slot's PCIe controller in that case is the switch. They may skip PCIe 2.0 speed and drop to PCIe 1.0 speed.ģ) Each NVMe drive is it's own PCIe device.Ĥ) The amfeltec dual and quad cards use a PCIe switch between the slot and the NVMe drives. Click to expand.1) Slot 3 and 4 use a different PCIe controller than Slot 1 and 2.Ģ) Different PCIe 3.0 devices may have different behavior with different PCIe 2.0 controllers. ![]()
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