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Will PCI-E x8 Hardware-based Raid card work in PCI-E x4?

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October 13, 2012 8:16:19 PM

Hi guys!

I have 2 PCI-E 2.0 x16 slots in my motherboard. One works with x16, the other one with x4 only.
The x16 one is taken (Graphic card). I have a hardware-based raid-5 card, but that card's work slot is x8.
My question is, if I put that x8 raid card into my x4 slot, will it work?

Thanks.
a c 82 V Motherboard
October 13, 2012 8:20:32 PM

GPUs are x16 and they work in x4 slots. No reason for it not to work, albeit with reduced peak transfer rates.

Only way to be certain is to check with your controller's manual or manufacturer.
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October 13, 2012 8:22:19 PM

InvalidError said:
GPUs are x16 and they work in x4 slots. No reason for it not to work, albeit with reduced peak transfer rates.

Only way to be certain is to check with your controller's manual or manufacturer.

Thanks, but actually I'm talking about hardware-based raid-5 card, not GPU
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a b V Motherboard
October 13, 2012 8:27:53 PM

The 4x slot is it as large as the 16x slot. Also, if so it will be able to work but the bandwith will be considerably less then a 8x slot.
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October 13, 2012 8:30:34 PM

bigshootr8 said:
The 4x slot is it as large as the 16x slot. Also, if so it will be able to work but the bandwith will be considerably less then a 8x slot.

But will it handle, let's say 6 drives? I'm afraid of data loss.
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a b V Motherboard
October 13, 2012 8:34:21 PM

What the raid card will handle will be based on what the card itself can already handle. The only thing that is concern here is it working and it would work at 4x which it should.
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a c 82 V Motherboard
October 13, 2012 9:03:49 PM

Dob3rman said:
But will it handle, let's say 6 drives? I'm afraid of data loss.

Doesn't matter how many drives there are. The PCIe interface width only changes the amount of bandwidth available for IO. This does not affect reliability or the number of drives that can be used.

An x4 interface is good enough for 20Gbps. If you use 6x 7200RPM HDDs, you might barely scratch 10Gbps if you use RAID0. Since you said you were worried about data loss, you will be using either RAID5 or RAID6 which means your array likely won't be pushing more than ~6Gbps, about a third the x4 slot's bandwidth.

So unless your controller has a quirk that makes it require a x8 slot for operation, there should be no problem with using x4.
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October 13, 2012 9:11:05 PM

Thanks all!
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!