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Tharayman

macrumors member
Original poster
Feb 4, 2018
32
2
I was looking into getting a PCI-E M2 adaptor for my 3,1 and was browsing several models. what puzzles me is the huge price differences between adaptor. From Highpoint`s 600$ extreme to a 300$ QNAP QM2-2P10G1T, and all the way down to 30$ for a two space adaptor from Startech. Is this a case of higher price - higher performance ? Or are the known brands just overcharging? Intuitively I would belive performance was mainly due to the drives you put in the adaptor, not the controller card itself...
 
Cheap adaptors are just passive adaptors to convert the M.2 connector to the PCIe slot.

Switched cards use PCIe switches to connect 2/4/6 M.2 blades to a 8x or 16x PCIe slot. PCIe switches cost over $120 just for the switch itself.
 
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It is important to have cooling for M2 SSD`s?
970PRO 5 minutes after power up, doing Spotlight indexing, gets to 74ºC. If you don't want to live with thermal throttle, or worse, overheat - use a heatsink.
 
It is important to have cooling for M2 SSD`s?

Others will have more technical answers, but I can tell you what my 970Pro is reporting. I cloned my old boot drive to it originally (300GB continuous write?) and I do weekly clone backups (80GB's at a time?) Total power on time for my drive is 1 month 17 days. My lifetime maximum temperature ever reached was 50c which is far below the recommended maximum limit of 81c.

That's with the AquaComputer kryoM.2 heatsink.
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970PRO 5 minutes after power up, doing Spotlight indexing, gets to 74ºC. If you don't want to live with thermal throttle, or worse, overheat - use a heatsink.


Really? Wow. Is that with a heatsink?
 
Really? Wow. Is that with a heatsink?
Without a heatsink. I was doing some tests with an SM951-AHCI 4-blade array with my SSD7101-A and used a Chinese no-name adapter with my 970 Pro, within 5 minutes from power up DriveDX warned about overheat.
 
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