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TomJ

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  1. Hi Sam, it is quite difficult to make statements without measurements, as much depends on the implementation. As I have already written, I would not necessarily prefer 10GbE. In addition, discrete transformers are usually superior to magjacks with integrated transformers in my opinion. The card has integrated transformers. If you look at the cards of the measurements in comparison, the cards that have more effort with the power supply have a clear advantage. This card doesn't seem to make too much of an effort here. But you don't know exactly what's under the heatsink. The only way to find out would be to measure it. If you would send it to me, I could measure it - but I have no ambitions to become a second Amir with an EthernetScienceReview ;-) But I think this is illusory, since I live in Germany and you most likely in the USA. Best regards, Tom
  2. I know. But it depends on the implementation - so a comparison would be interesting.
  3. What else is on your list? My measurements tell me that 10GbE is not necessarily the way to go. I am currently looking for new objects for my measurements and am currently browsing through the Supermicro catalog. I would also like to test a Jcat net card xe or the new Sotm card to compare, but I exclude these currently, because I think that the manufacturers of such exclusive parts should actually publish such measurements themselves and apparently shy away from the comparison.
  4. I wouldn't bet too much on this card. Maybe the PHY is very good, but the power supply might be the weak point.
  5. Thats a good question. Since I am still quite new in the forum, I put the question back to you: Where would the topic be better located? My mission is to bring more objectivity into the Ethernet sound discussion with my measurements and maybe find reasons for this. I am a very analytic person and I am very familiar with ethernet and its protocols. Nevertheless I hear differences from cables, isolators and switches.
  6. Intel PRO/1000 PT Dual Gigabit Server NIC with 82571EB chipset
  7. Hi all, Since I am looking for the cause of the different sound of LAN cables and switches, I had bought on Ebay Tektronik TDS784A 1GHz oscilloscope. To get a good 100Base TX reference for my cable measurements I wanted to check which network card produces the best Ethernet signal and also sounds best. NIC in my Test Intel X540 T2 10GbE Dual Server NIC The question was if a 10GbE card produces a better 100Base TX Supermicro AOC-STG-i2T 10GbE Dual Server NIC The question was if a 10GbE card produces a better 100Base TX and how does the Supermicro competes with the Intel Intel PRO/1000 PT Dual Gigabit Server NIC with 82571EB chipset Intel i350 T2 Dueal Gigabit Server NIC Question: How does the i350 card compete with the older 82571EB card? Intel i210 Desktop 1 Port Nic very small card that doesn't have much power conditioning and isn't that complex Question: means less complexity a better sound? TP-LINK TG-3468 1 Port Nic This card was already praised in other threads here very small card that doesn't have much power conditioning and isn't that complex Question: means less complexity a better sound? Test Setup Host system for the NICs Gigabyte Z97N-WIFI motherboard with WLAN deactivated, PCIe slot and HDD raid system Windows home Server 2011, which is actually a Windows Server 2008 Cable 1 meter of a shielded Gore ePTFE CAT cable, which is my current reference and with best measurements so far and best signal. Shielding only connected to the NIC End device and measuring point A discarded Asus WIFI router on which the measurement was made at the RJ45 connector's release points - in front of the router's transformer. So no Magjack. The router produces a very distinctive signal, so that one can quickly recognize in which auto MDI-X mode the router and the card are. Measuring instruments Oscilloscope: An old Tektronix TDS784A 1Ghz Probes: 2 x Tektronix P6245 active 1.5Ghz probes The grounding of the probes was bridged and the Ethernet differential signal was generated via a Math function in the scope Result I don't want to go too much into the sound differences, as this is always very subjective, but roughly give a tendency. The sound was determined by a direct connection of the network cards with my KEF LS50 W II. Intel X540 T2 10GbE Dual Server NIC The 10GbE card is apparently really optimized for 10Gb, but does not produce the best 100Base TX signal. The sound is a bit brighter and shriller. Supermicro AOC-STG-i2T 10GbE Dual Server NIC Similar results to the Intel X540 card. It also has the same chipset. Intel PRO/1000 PT Dual Gigabit Server NIC with 82571EB chipset A somewhat wavy eye patter. A bit less nervous than the 10GbE cards. The Intel i350 Dual Gigabit Server NIC produces the cleanest signal and is also the winner sonically in my system with a very clean, quiet sound. It has the same chipset as the Jcat cards. Intel i210 Desktop 1 Port Nic Poor signal and eye patter. Sound is a bit dull. TP-LINK TG-3468 1 Port Nic The very worst card in the test. Also very dull and undifferentiated on the sound side. No idea what the colleagues find sonic about this one. Summary If you want a very good network card and do not necessarily want to buy audiophile cards with super clocks (although I would like to see measurements of this), then I can highly recommend the Intel i350 T2. Measurements in next posts
  8. But there are freaks out there using clocks made for audio to mod network devices.
  9. There are different transformers with different quality regarding return loss, crosstalk and insertion loss. Also there are transformers with only one transformer coil and others have common mode chokes. All this has an impact on the signal quality. And if you think something is going to be improved on a very well developed product like a network card or switch, I am surprised (actually it doesn’t surprise me, since clocks is the new sport among audiophiles) that you don’t start here. Most transformers are not made very precisely. Like this: Just think that a signal produced by a $ 1,000 clock has to go through this common mode choke grave - throwing pearls to swine. There are now machine-made transformers with a very high level of accuracy. Like this: Regards, Tom
  10. All switches and other ethernet devices have transformers, because this is part of the ethernet spec. Transformers are integrated in the RJ45 or as a dedicated chip on board. As the transformers have also an impact on the signal, I think it could also be a topic for modding, but as you mentioned before, audiophiles take to much care about clocks (with lousy implementation)....... Would be very interesting to see measurements and eye pattern of this home brewed devices and mods.
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