Mellanox ConnectX-3 on ebay look strange

K

krista

New Member
Dec 22, 2015
23
6
3
40
it appears these cages were to control airflow in a 1u ot 2u rack server. noisy little beasts of 40mm fans, sometimes 40x56mm!! and often shredding air at nearly 30,000 rpm while screaming like a constipated deamon child trying to pass yoko ono... while on fire. oh, and there's a large number of them. they're all blowing the same direction, usually front to back.

as they spin so fast and are very thicc (heh) they create a *lot* of static pressure, which is necessary to move air in a very compact and filled chassis. the longer and thinner air channels get, the harder it is to push air through, and the more static pressure you need to get the job done.

one *very* clever thing thermal engineers do while designing 1u systems is to balance and use the flow generated by these wee dangerous beasties† to cool everything without additional fans. you will notice heatsinks designed specifically ppl l
 
BeTeP

BeTeP

Well-Known Member
Mar 23, 2019
552
347
63
Usually posters confirm the "greatness" of the deal (by communicating with the seller or just ordering a sample) before posting here.

As for your question, in this case the seller is "confusing" because they are either stupid (used wrong stock picture by accident) or plain dishonest. The price is not that great either. So hard pass.
 
G

gzorn

Member
Jan 10, 2017
77
14
8
I don't trust ads that have obvious BS in them. ConnectX-3 cards run at PCIe 3.0, not 4.0. Also, I think that the 341 is a mezzanine card. I second the hard pass.
 
BeTeP

BeTeP

Well-Known Member
Mar 23, 2019
552
347
63
Thomas42 said:
I got one. It is a mezzanine card mounted on an adapter.
Click to expand...
This depending on the brand (i.e. mezzanine card standard) could be interesting just for the slot adapter alone. Nice thing to have for testing and whatever purposes. Can you post pictures?
 
  • Like
Reactions: Rain
M

matthew5025

New Member
Mar 21, 2016
24
19
3
Attached more photos for the curious :D

hmartin said:
I want to buy just the OCP to PCI-E adapter. Haven't been able to find one anywhere.
Click to expand...
There's a pic of the adaptor too, hope it helps in your search!
 

Attachments

  • Like
Reactions: JanCerny, Lance Joseph, JustinClift and 4 others
hmartin

hmartin

Active Member
Sep 20, 2017
249
175
43
34
The seller replied to my question and seems willing to discuss selling the OCP to PCIe adapter separately.

Quantity and price are still unknown. I'm assuming people would want an OCP mezz to PCIe x8 version?
 
  • Like
Reactions: altmind, JustinClift and RageBone
I

int0x2e

Member
Dec 9, 2015
88
61
18
41
hmartin said:
The seller replied to my question and seems willing to discuss selling the OCP to PCIe adapter separately.

Quantity and price are still unknown. I'm assuming people would want an OCP mezz to PCIe x8 version?
Click to expand...
Just out of curiosity, which OCP mezz cards are you guys trying to adapt to regular PCIe? I've got a couple of OCP based machines and most of my mezz slots are empty. It always seemed to me that regular PCIe cards were more cost effective, but I'm guessing there's something big I've been missing...
 
S

semidetached

Member
Sep 18, 2018
70
63
18
int0x2e said:
Just out of curiosity, which OCP mezz cards are you guys trying to adapt to regular PCIe? I've got a couple of OCP based machines and most of my mezz slots are empty. It always seemed to me that regular PCIe cards were more cost effective, but I'm guessing there's something big I've been missing...
Click to expand...
I grabbed one of these for a server that has an OCP slot to free up a PCIe slot, but it could be useful for anyone wanting a 40GbE ConnectX-3 Pro (for VXLAN or RoCEv2)
Mellanox MCX345A-BCPN ConnectX-3 40GbE QSFP+ PCIe 3.0 x8 Network Adapter Card | eBay
 
  • Like
Reactions: JustinClift and int0x2e
BeTeP

BeTeP

Well-Known Member
Mar 23, 2019
552
347
63
hmartin said:
The seller replied to my question and seems willing to discuss selling the OCP to PCIe adapter separately.
Click to expand...
Often when I express genuine interest in some obscure and therefore relatively low priced item and start asking questions - my questions help the seller to discover item's true value and they raise the prices. So if the price is reasonable - I tend to buy first and ask questions later.
 
  • Like
Reactions: JustinClift
I

int0x2e

Member
Dec 9, 2015
88
61
18
41
J

JustinClift

Member
Oct 5, 2014
35
14
8
@matthew5025 Would you be ok to post some further pics of the mezzanine card itself?

In the photo's above there don't seem to be any markings of Mellanox nor board identifiers (part/model #, etc). I've never used a Mellanox mezzanine board before, so no idea if that's normal for them. With their PCI-E ones though, they normally have clear markings.

Really curious about the OCP to PCI-E adapter too. In the UK and Australia, the mezzanine cards are almost always cheaper on ebay (sometimes by a lot) compared to the PCI-E ones. Having a supply of those adapters - especially x8 or x16 - could open up some possibilities. :)
 
hmartin

hmartin

Active Member
Sep 20, 2017
249
175
43
34
JustinClift said:
Really curious about the OCP to PCI-E adapter too. In the UK and Australia, the mezzanine cards are almost always cheaper on ebay (sometimes by a lot) compared to the PCI-E ones. Having a supply of those adapters - especially x8 or x16 - could open up some possibilities. :)
Click to expand...
OCP mezz cards are PCIe x8, there is no x16 mezz card to my knowledge.

The seller replied that for QTY 50, they wouldn't sell the OCP to PCIe adapter for less than the current price of the single port card ($22 USD + S&H) and they're not interested in listing the adapter separately.

So buying the adapter from them is not an economical option.
 
  • Like
Reactions: JustinClift
J

JustinClift

Member
Oct 5, 2014
35
14
8
Interesting. But they'd be willing to sell the adapter (x4, or x8?) with a minimum qty of 50? If so, what price (in total) for the 50?

If the adapters seem legit + price is reasonable, we might be able to split costs or something. :)
 
Last edited:
  • Like
Reactions: RageBone
You must log in or register to reply here.
Top Bottom