x4 at pci-e 1.0 bus speed should not have bus bandwidth issues with sata speeds but controllers that are designed for PCI Express® 2.0 bus are not guaranteed to perform the same at 100 percent less bus clock.
You don't get sata 3 speed from a sata 1 or sata 2 controller.
150 Mbps, 300 Mbps, 600 Mbps is theoretical speed not guaranteed speed.
Lsi9211 is SAS not sata and its speed is based on x8 lane PCI Express® 2.0
So in a 1.0 bus at 4 lanes its speed is 1/2 and 1/2 again. Aka 400 percent slower than at
speedstep
9 Legend
•
47K Posts
1
June 13th, 2015 17:00
pcie 1.0 DDR2 Ram intel 5000X chipset
PCIe Architecture
Raw Bit Rate
Bandwidth per Lane Direction
Total Bandwidth for a x16 Link
Note: Table above contains speeds for PCI Express 1.0 bus. For version 2.0, multiply all bandwidths by 2.
PCIe 1.0
2.5 GTps
~250 MBps
~8 GBps
PCIe 2.0
5.0 GTps
~500 MBps
~16 GBps
PCIe 3.0
8.0 GTps
~1 GBps
~32 GBps
arkangel1975
2 Posts
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June 13th, 2015 19:00
Thank you for your response,
One more question, If I am LSI 9211 controller (6gbs, pcie 4x), what kind of throughput should I expect with a samsung 850 evo SSD?
speedstep
9 Legend
•
47K Posts
1
June 14th, 2015 15:00
x4 at pci-e 1.0 bus speed should not have bus bandwidth issues with sata speeds but controllers that are designed for PCI Express® 2.0 bus are not guaranteed to perform the same at 100 percent less bus clock.
You don't get sata 3 speed from a sata 1 or sata 2 controller.
150 Mbps, 300 Mbps, 600 Mbps is theoretical speed not guaranteed speed.
Lsi9211 is SAS not sata and its speed is based on x8 lane PCI Express® 2.0
So in a 1.0 bus at 4 lanes its speed is 1/2 and 1/2 again. Aka 400 percent slower than at
X8 PCI Express® 2.0
http://www.lsi.com/products/host-bus-adapters/pages/lsi-sas-9211-8i.aspx#tab/tab2