Solved!
Go to SolutionA
arkangel1975
2 Posts
0
14694
June 13th, 2015 10:00
Precision 490
I am having some issues with a clarification on this question
Are the PCI-E slots on the Precision 490 1.0, 2.0, or 2.1 of some combination of that?
All I can seem to find is that some say the 16x slot is 2.0, but what about the 8x slots (that are wired as 4x). The questions is for SSD speed capability. I do know the onboard sata are 3gbs.
arkangel1975
2 Posts
311
0
Posted 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?
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
speedstep
11 Legend
•
46969 Posts
311
1
Posted 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