Comparison: Intel i350-T4 Genuine vs Fake

newabc

Active Member
Jan 20, 2019
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Lots of Chinese manufacturers use i350-am4 on their own brands' NICs with a price over $100 on Aliexpress.
If you look at a same brand, their quad port i350 NIC usually has a higher price than their dual port SFP+ card with 82599ES chip. There must be something wrong on the market.
 

Spc

New Member
May 16, 2020
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I have both, original with yotta mark and one that is fake.
Both of them work perfectly fine i see no difference in performance.

If you look here:

Chipsets are still being produced, T2 version is discounted.


However i still think that 311€ for new original intel card i350-T4V2 is a ripoff, it's a gigabit only card with 4 ports:


For this money i can get 10Gbit+ cards.

My fake card has MACOM LAN transcoders:


I got the FAKE one for 25€

Even if it dies 25€ is really like nothing.

ndis version for Windows Server 2022:
Code:
Name                         NdisVersion
----                         -----------
LAN2                         6.85
LAN - LACP
LAN1                         6.85
LAN3                         6.85
LAN4                         6.85
It works, no problems, i am using LACP 4Gbit/s to my main switch.
 
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Spc

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May 16, 2020
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What i do not get is why are those cards PCIe x4 is it because of backward compatibility to PCIe 1.x or maybe lower latency to i350 controller ?
PCIe x2 should be enough for 4x GbE ports.

Let's say we have 4 port i350.
This means 4Gbit up and 4Gbit down in total.

PCIe 1.x (4 lanes): 8Gbit/s (UP and DOWN)
PCIe 2.x (4 lanes): 16Gbit/s (UP and DOWN)

PCIe 1.x (1 lane): 2Gbit/s (UP and DOWN) - too SLOW
PCIe 2.x (1 lane): 4Gbit/s (UP and DOWN)

So for example even if someone puts this card into PCIe 2.1 (x1) slot, it should work at 500MB/s, which is exact 4000Mbit/s, due to some overhead you get arround 3,8Gbit/s even in 1x slot (PCIe 2.0).
 
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cdru

Member
Oct 27, 2018
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What i do not get is why are those cards PCIe x4 is it because of backward compatibility to PCIe 1.x or maybe lower latency to i350 controller ?
A x1 PCIe 2.x slot supports 4 gigabits per second of raw usable data. However that doesn't account for error correction, addressing, headers, etc. All the similar types of protocol overhead that apply to Ethernet, IP, and TCP or UDP you may be more familiar with also apply to PCIe. Depending on link specifics, overhead may be ~25%. That's dropping things significantly more than the 3.8gigabits per second you mentioned.

PCIe x2 should be enough for 4x GbE ports.
When was the last time you saw a PCIe x2 slot? I can't recall ever seeing one in person. Even if they made the card x2 for that unicorn of a mobo, for a huge number of machines it's going to go into either a 1x slot and potentially not living up to it's advertised abilities, or into a 4x slot and have much more bandwidth than it really needs. The chipset negotiates to use as many lanes as are available, so the only issue becomes does it fit into the slot.
 

Spc

New Member
May 16, 2020
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A x1 PCIe 2.x slot supports 4 gigabits per second of raw usable data. However that doesn't account for error correction, addressing, headers, etc. All the similar types of protocol overhead that apply to Ethernet, IP, and TCP or UDP you may be more familiar with also apply to PCIe. Depending on link specifics, overhead may be ~25%. That's dropping things significantly more than the 3.8gigabits per second you mentioned.

When was the last time you saw a PCIe x2 slot? I can't recall ever seeing one in person. Even if they made the card x2 for that unicorn of a mobo, for a huge number of machines it's going to go into either a 1x slot and potentially not living up to it's advertised abilities, or into a 4x slot and have much more bandwidth than it really needs. The chipset negotiates to use as many lanes as are available, so the only issue becomes does it fit into the slot.
Yea that's true.
I've never seen PCIe x2 slot.

In official documentation x1 x2 and x4 slots are mentioned:
i350-pcie.png

I found a x2 slot:

1 x PCIe 4.0 x16 slot (supports x2 mode)

It's physical 16 slot but it works in only x2 mode.
 
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Spc

New Member
May 16, 2020
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I just saw new video Patrick put up on youtube about G242-P32 Gigabyte server.
One thing i noticed, it is still using i350 chipset for LAN.

LAN:
2 x 1GbE LAN ports (1 x Intel® I350-AM2)

Management:
1 x 10/100/1000 Mbps management LAN

So i guess i350 is still pretty much alive in end of 2022.



:)


Other models also use i350: