I want to build a hardware RAID1 setup with two HDDs (SATA3, 7200, 64MB cache) and I'm looking at two, almost the same, Adaptec cards (6405E vs 6805E)

The 6405E is PCI-E 2.0 x1 while the 6805E is PCI-E 2.0 x4. Both are 128MB cache.

If I take the 6405E, will the PCI x1 bandwidth bottleneck be really visible? This won't be a system drive, just data.

NB: Other Adaptec models might better suit my needs/budget (eg: 6405), but I can't find them online.

PS: Yes I know, the battery module is not included (6405E) / not possible (6805E)


If either will work, and you're only connecting 7200RPM SATA drives to it, I doubt you'll saturate a PCIe 2.0 1x lane.


States that it should be able to perform at about 500mb/s, per lane (the 4x connector would offer about 2gb/s). PCI Express 2.0 has about a 20% overhead, so your actual maximum throuput is about 400 mb/s, but throughput of 7200 RPM drives is generally under the 100 mb/s range. Unless you need more than 4 disks, I think the 6405E will fit nicely.

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    As far as the battery module goes, My opinion is that you shouldn't need it unless you have mission critical production data that has a lot of random IOPS. Considering you're using SATA 3 7200 RPM drives instead of 10k ones, I think you can get away with putting the computer on a decent UPS. – IceMage May 20 '15 at 14:52
  • For some dumb reason, I forgot to take in account the throughput of a HDD drive... well below 600MB/s. – BlakBat May 20 '15 at 15:16

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