Are there any limitations on PCI Express bandwidth..

[ng7apoc]

..When using all 4 Slots?

What I mean is that if I were to purchase a refurb 2009/10 Mac Pro and in addition to the Video card I were to fill the remaining 3 slots with a 2 port USB 3.0 card, 2 port eSATA card and a SATA 3/6GBps RAID card would I see any bottleneck in bandwidth if all 3 cards were in full use?

 

[goMac]

No.

Individual slots have their own restrictions, but they're all independent.

 

[bax2003]

Since 2008 Mac Pro (3.1), PCIe is v2.x.

Specs for x1 bandwidth (V2.x) is 500 MB/s (5 Gb/s).
Slots in Mac Pros are x16, x16, x4 and x4, so only limitation is bandwidth per slot.

 

[alphaod]

The PCIe slots do not share bandwidth.

 

[COINcoin77]

The PCIe slots do not share bandwidth.

Correct me if I'm mistaken, but what I understood about the way PCIe slots are wired is as following:
On the 2009/2010 models, 36 lanes are available. 16 wired for slot 1, 16 wired for slot 2, and the 4 remaining being wired to slot 3 and 4.

So slots 3&4 cannot run both at full 4x bandwidth at the same time.

 

[GermanyChris]

Correct me if I'm mistaken, but what I understood about the way PCIe slots are wired is as following:
On the 2009/2010 models, 36 lanes are available. 16 wired for slot 1, 16 wired for slot 2, and the 4 remaining being wired to slot 3 and 4.

So slots 3&4 cannot run both at full 4x bandwidth at the same time.

This is correct I believe..