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what will pci-e 3.0 slot run at with fm2 cpu rather than fm3?

Last response: in Motherboards
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August 9, 2014 10:07:30 AM

msi a88x-g45 gaming has 2 pci-express 3.0 slots (x 16, 8) but requires fm2+ cpu for pci-e 3.0. want to use 2 supermicro AOC-SAS2LP-MV8 PCI-Express 2.0 x8 SATA / SAS 8-Port Controller Cards. can i use fm2 cpu or will i require fm2+ cpu?

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a b 4 Gaming
a c 487 V Motherboard
a c 387 à CPUs
August 9, 2014 11:49:46 AM

You can use any CPU/APU the MB will accept. Even if the slots only work at PCIe 2.0 bandwidth, it is still faster than any card today can move data at. No single GPU card I'm aware of today can saturate the bandwidth of PCIe 2.0.
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September 1, 2014 6:14:03 PM

clutchc said:
You can use any CPU/APU the MB will accept. Even if the slots only work at PCIe 2.0 bandwidth, it is still faster than any card today can move data at. No single GPU card I'm aware of today can saturate the bandwidth of PCIe 2.0.


Not only are few, if any, GFX cards capable of saturating PCIe 2.0, but very few cards are PCIe 3.0 compliant. The AOC-SAS2LP-MV8 is v2.0, so even if you had a FM2+ CPU, the card would still only operate at 2.0 speeds.

On top of that, the most likely use for a system like what you're describing is as a home storage server. In that case, network performance is going to be a major impediment to throughput, not disk performance.
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September 1, 2014 9:20:53 PM

sewalk said:
clutchc said:
You can use any CPU/APU the MB will accept. Even if the slots only work at PCIe 2.0 bandwidth, it is still faster than any card today can move data at. No single GPU card I'm aware of today can saturate the bandwidth of PCIe 2.0.


Not only are few, if any, GFX cards capable of saturating PCIe 2.0, but very few cards are PCIe 3.0 compliant. The AOC-SAS2LP-MV8 is v2.0, so even if you had a FM2+ CPU, the card would still only operate at 2.0 speeds.

On top of that, the most likely use for a system like what you're describing is as a home storage server. In that case, network performance is going to be a major impediment to throughput, not disk performance.


thank you!
Supermicro 8 port sata controller cards for server, not video. use on chip video, headless. old server unraid on recycled xp machine with mish-mash cards (some sata 1). parity checks take forever (using unraid at 9 disks). want to use Norco 4224 chassis to 24 discs (good to next lifetime), 8 on motherboard, 8 on each of supermicro controller cards. if pci-e works at 2.0 with fm2 can save some money over fm2+, meet needs.

agree network is limiting step--even sata 1 controller cards allow satisfactory function of server for my needs (home server). just that parity checks very slow. do not expect any improvement of function by going to sata 2 or 3 over sata 1 in any area other than parity checks. just need to know it will work (pci-e 2.0 with fm2 in this motherboard rather than fm2+). searched high and low and could not find answer to speed of pci-e 3.0 slot with fm2 rather than fm2+.

thank you again!

bob
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