ConnectX-4 LX $25.99-Seller raised to $39.99

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Civiloid

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Jan 15, 2024
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That seems to be rather common price point for lots from US nowadays. I've some time ago bought about 5 of HP-branded CX 4 Lx for about same price and even with forwarding from US it was cheaper than China prices.
 
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luckylinux

Active Member
Mar 18, 2012
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Just note that ASPM seems to work only if these are plugged into the PCH/DMI/Chipset.

I yet have to manage getting these to work with ASPM if they get plugged into a directly CPU-connected PCIe Slot !

Other than that, yeah, I managed to get a few Deals from UK to EU a few Months back for a Similar Price including Import Charges.

Now that eBay is broken from US to DK, the UK is kind of the last "Bastion" for reasonably good Prices :confused: .
 
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Sep 22, 2015
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Be a little careful. I've had issues with these being sensitive to motherboards, and downgrading link speed to PCIe 1.0.

I've had two different cards and two different motherboards exhibit this issue. 25gb Intel NICS and even Broadcom NICS didn't have the same issue.
 

jbv1982

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Nov 5, 2017
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I was able to pick up a couple of Cx4-Lx with one Mellanox SFp28 for 25 each last week, so this seems to be a normal price.
 
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Michael Hall

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Oct 9, 2015
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Be a little careful. I've had issues with these being sensitive to motherboards, and downgrading link speed to PCIe 1.0.

I've had two different cards and two different motherboards exhibit this issue. 25gb Intel NICS and even Broadcom NICS didn't have the same issue.
Hmm... They'll be going in the X10SLL-F in my NAS and the P330 Tiny-based Proxmox+Ceph cluster I'm building, so hopefully everybody'll get along...
 

luckylinux

Active Member
Mar 18, 2012
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Hmm... They'll be going in the X10SLL-F in my NAS and the P330 Tiny-based Proxmox+Ceph cluster I'm building, so hopefully everybody'll get along...
No Issues with Supermicro X10SLL-F or Supermicro X10SLM-F or even Supermicro X11SLL-F, provided that you plug the NIC into the PCH/DMI/Chipset Connected PCIe Slot, for ASPM to work. But you'll be limited to 16gbps Total Bandwidth (X10SLL-F in PCH Slot), so either you enable Switchdev / Offload and/or possibly ROCE v2 if you want to switch/route between the 2 Ports and possibly saving on PCIe Traffic/Bandwidth (unsure how much Bandwidth would be saved by these Offloads though). PCH/DMI/Chipset Shares Bandwidth with SATA/Onboard NIC so you'll lose quite a bit of Bandwidth if you put it there. On the Supermicro X11SSL-F it's a bit better with up to 32gbps theoretical Bandwidth so if you don't use too much in SATA then it's OK. It depends what you care about: Speed or power Consumption ?

Of, if you don't care about ASPM and Power Consumption / Temperatures at all, plug it into the fastest x16/x8 Slot you want, and most likely you'll be stuck at PC2/PC3 (Package C-State 2 or Package C-State 3) and high Idle Power Consumption :) .
 
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nabsltd

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Jan 26, 2022
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Of, if you don't care about ASPM and Power Consumption / Temperatures at all, plug it into the fastest x16/x8 Slot you want, and most likely you'll be stuck at PC2/PC3 (Package C-State 2 or Package C-State 3) and high Idle Power Consumption.
My 10Gbps (or faster) server NICs are never idle, and I suspect that this is true for many people. With even 3-4 running VMs where their storage is on the other end of the link, it's always doing something.
 

luckylinux

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Mar 18, 2012
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My 10Gbps (or faster) server NICs are never idle, and I suspect that this is true for many people. With even 3-4 running VMs where their storage is on the other end of the link, it's always doing something.
Sure, not 100% Idle, but maybe 30%-50% Idle and there from PC2/PC3 down to PC6 (or PC7 or higher) makes quite a bit of Difference I'd say.

Take a look at turbostat e.g.

Code:
turbostat --show Avg_MHz,Busy%,Bzy_MHz,TSC_MHz,POLL,POLL%,C1%,C1E%,C3%,C6%,C7s%,CPU%c1,CPU%c3,CPU%c6,CPU%c7,Pkg%pc2,Pkg%pc3,Pkg%pc6,Pkg%pc7,Pkg%pc8,Pkg%pc9,Pk%pc10,PkgWatt,CorWatt,IPC,IRQ,SMI --interval 0.5
 

Civiloid

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Jan 15, 2024
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Be a little careful. I've had issues with these being sensitive to motherboards, and downgrading link speed to PCIe 1.0.
I haven't seen such problems on latest firmware. On earlier ones - it is hit-or-miss tbh, they even don't post on some consumer motherboards with really old firmwares.
 

bugacha

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Sep 21, 2024
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Cruzader

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Jan 1, 2021
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I had 20$/ea for 12 accepted on this listing, feels like a fairly standard price for them.

There is a 25$/ea listing with offers enabled that has been up for a long time also, but have not tried offering on that one.
I always do 1-2 lowball offers before offering what i expect them to accept to feel out if its declined or where the counters are at.

Now and then you get a nice suprised when the borderline insulting lowballs like 20-25$ on 100$ listings are accepted.
 

Prophes0r

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Sep 23, 2023
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East Coast, USA
It was listed for $25.95 at the time I made my offer, and the initial post. Seems the seller raised the price since then.
Why not update the post title then?
You took the time to reply with a perfectly valid reason, but only you(or a mod?) can update the title.
It takes moments to fix.
 

fohdeesha

Kaini Industries
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Sure, not 100% Idle, but maybe 30%-50% Idle and there from PC2/PC3 down to PC6 (or PC7 or higher) makes quite a bit of Difference I'd say.

Take a look at turbostat e.g.

Code:
turbostat --show Avg_MHz,Busy%,Bzy_MHz,TSC_MHz,POLL,POLL%,C1%,C1E%,C3%,C6%,C7s%,CPU%c1,CPU%c3,CPU%c6,CPU%c7,Pkg%pc2,Pkg%pc3,Pkg%pc6,Pkg%pc7,Pkg%pc8,Pkg%pc9,Pk%pc10,PkgWatt,CorWatt,IPC,IRQ,SMI --interval 0.5
No Issues with Supermicro X10SLL-F or Supermicro X10SLM-F or even Supermicro X11SLL-F, provided that you plug the NIC into the PCH/DMI/Chipset Connected PCIe Slot, for ASPM to work. But you'll be limited to 16gbps Total Bandwidth (X10SLL-F in PCH Slot), so either you enable Switchdev / Offload and/or possibly ROCE v2 if you want to switch/route between the 2 Ports and possibly saving on PCIe Traffic/Bandwidth (unsure how much Bandwidth would be saved by these Offloads though). PCH/DMI/Chipset Shares Bandwidth with SATA/Onboard NIC so you'll lose quite a bit of Bandwidth if you put it there. On the Supermicro X11SSL-F it's a bit better with up to 32gbps theoretical Bandwidth so if you don't use too much in SATA then it's OK. It depends what you care about: Speed or power Consumption ?

Of, if you don't care about ASPM and Power Consumption / Temperatures at all, plug it into the fastest x16/x8 Slot you want, and most likely you'll be stuck at PC2/PC3 (Package C-State 2 or Package C-State 3) and high Idle Power Consumption :) .
what's high power consumption? 9 watts instead of 6? I think I'll survive lmao
 

luckylinux

Active Member
Mar 18, 2012
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what's high power consumption? 9 watts instead of 6? I think I'll survive lmao
You'll see :p.

EDIT 1: it's NOT (only) about the Power Consumption of your NIC. It's about the CPU NOT being able to sleep, so maybe 10-20W more on a Xeon E3 Platform ...

EDIT 2: So maybe you'll have 30-40W at the Wall instead of 15-20W (at Idle) :p . Then the only one LMAO will be the Electricity Supplier :p
 
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fohdeesha

Kaini Industries
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You'll see :p.

EDIT 1: it's NOT (only) about the Power Consumption of your NIC. It's about the CPU NOT being able to sleep, so maybe 10-20W more on a Xeon E3 Platform ...

EDIT 2: So maybe you'll have 30-40W at the Wall instead of 15-20W (at Idle) :p . Then the only one LMAO will be the Electricity Supplier :p
An extra 20 watts would be about 90 cents a month here, not that I'd notice it given my rack is currently at something like 930w. I can't imagine a cpu in a 10gbe machine would have the opportunity to go to sleep very often if ever, if I'm building a server or firewall it tends to.....do things
 
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