Does this support full throughput for all 4 links simultaneously, i.e. 40gbps tx and 40gbps rx?

The maximum throughput of the PEX10GSFP4I is limited by the bus interface. PCI Express Gen 1.0 max throughput is 2Gbps per lane. PCI Express Gen 2.0 max throughput is 4Gbps per lane. PCI Express Gen 3.0 max throughput is 8Gbps per lane. The available bandwidth (64Gbps) is shared equally between the four ports. Atha, StarTech.com Support

Is the open sfp style sfp+? the title says sfp+, but that style isn't specific. there is a difference between them so it should be specified somewhere

The PEX10GSFP4I has 4 open SFP+ ports capable of 10Gbps speeds. Stefan, StarTech.com Support

Will cisco sfp-10gb-sr sfp's work in this nic?

Yes, we would expect those Cisco SFP modules to work. We’ve specifically tested the card with our version of a very similar SFP-10G-SR module (SFP10GSRST) Curtis, StarTech.com support

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INTEL XL 710 CHIPSET - Industry-leading chipset with virtualization and jumbo frame support for seamless, high-performance networking.
QUAD PORT POWERHOUSE - Four SFP+ slots for ultimate redundancy or link aggregation—never compromise on uptime.
BLAZING 10 GBPS SPEEDS - Experience lightning-fast data transfers that keep your mission-critical servers ahead of the curve.
FLEXIBLE FIBER OPTIONS - Use multimode or single-mode fiber with MSA-compliant modules or DAC cables for tailored network solutions.
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The StarTech.com Quad Port 10G SFP+ Network Card delivers robust 10 Gigabit Ethernet connectivity with four versatile SFP+ ports, powered by the Intel XL710 chipset. Designed for high-demand data centers and professional workstations, it supports multimode and single-mode fiber, PCIe 3.0 x8 interface, and broad OS compatibility. Ideal for virtualization, SAN, and iSCSI offloads, this NIC ensures scalable, fault-tolerant, and ultra-fast network performance backed by a 2-year warranty and lifetime support.

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Brand	StarTech
Series	PEX10GSFP4I
Item model number	PEX10GSFP4I
Operating System	Windows 8 Windows 7 Windows Server 2012 Windows Server 2008 R2 Linux Windows 10 Windows Server 2016 Windows Server 2019
Item Weight	4.5 ounces
Product Dimensions	5.47 x 0.59 x 4.72 inches
Item Dimensions LxWxH	5.47 x 0.59 x 4.72 inches
Color	Black
Manufacturer	Startech.com
ASIN	B07235332V
Is Discontinued By Manufacturer	No
Date First Available	May 17, 2017

StarTech.com Quad Port 10G SFP+ Network Card - Intel XL710 Open SFP+ Converged Adapter - PCIe 10 Gigabit Ethernet Server NIC - 10GbE Fiber Optic LAN Card - Dell PowerEdge HPE ProLiant (PEX10GSFP4I)

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