server R640 network card sfp+ 10GB while switch ports 1GB

Yes I think, then if you want an official answer you can contact presales team 

Hello

the mentioned transceiver is spf while server port is sfp+, do you think it will work on 1 GB Ethernet?

Hello,

yes you can use this transciver 

Dell Networking, Transceiver, SFP, 1000BASE-T - up to 100 m | Dell USA

How can I contact them

You can see contacts in our website based by your country. Or a reseller here PartnerSearch (https://dell.to/3wm7wLd)

Hello

Now I decided to replace the existing NIC (Intel X710 Quad Port 10Gb Direct Attach, SFP+Ethernet) with new NIC card (Broadcom 5720QP 1GBb Network Daughter Card, Customer Kit)

My question, after replace the card, do I need to install any driver manually on iDrack or iDrack shall detect it automatically?

Please note the below is the link of the new card

https://www.dell.com/en-us/shop/broadcom-5720-qp-1gb-network-daughter-cardcustomer-kit/apd/540-bbhg/networking

Hello maherkhalil,

You should have no problem installing it and being detected just fine.

You may want to make sure it is up to date on firmware once you get it installed:

R640 drivers/firmware

https://dell.to/3H7Lq4d

So, I have to installed the new card then do iDRACK manual update. that is all right?

because my server in production and my customer will be angry if I took more time. I do not want to be surprised 

Hello if you are using a SFP+ cable, not UTP cable, you will need a switch in the middle.