[Solved] XPS 15 - 9550 not able to reach 40Gbps over TB3?
https://www.reddit.com/r/Dell/comments/5nbjsa/dell_confirms_the_xps_15_9560_to_have_tb3/ connected via 4x of PCIe3.0
I would take that with a grain of salt. Support staff typically responses based on technical reference/guideline rather than checking over the physical product to confirm it has what it's supposed to.
On a related note, I've seen web traffic from Round Rock, TX where Dell HQ is. It's possible Dell is looking into this issue. If you have a XPS with TB3, check the PCIe speed. File a complaint with Dell if it's not running at 4x.
I plan to file a complaint. My Current 9550 has already had problems for months exchanging parts and motherboards twice already. The only thing that's stayed since the original purchase is the hard drive.
Good news for 9550 owners:
There's a 9550 user in China has successfully tested out Akitio Node (with akitio's recently updated firmware) with XPS 9550 and RX480. And what's more, it seems from data pulled out from AIDA 64, when eGPU is at full load, the firmware would switch the BUS to PCIE3.0x4 mode and when in quiescent mode, the firmware will switch the BUS to PCIE1.1x4 mode. Here are some screenshots and benchmark scores using Optimus internal LCD mode.
first is the thunderbolt firmware version
(original post is here if you guys don't bother reading Chinese: http://tieba.baidu.com/p/4879977216?pn=4)
nando4>> This eGPU implementation's accelerated internal LCD mode is using AMD X-Connect
A couple of points about your x4 3.0 comments on the XPS 9550:
1. The x4 3.0 / x4 1.0 switching screenshots you show is the video card's power management.
2. We know the video card electrically connects to the TB3 enclosure bridge at x4 3.0 speed. That TB3 controller then communicates with the notebook TB3 controller down a Thunderbolt channel. Then another TB3 controller is attached to the notebook's PCIe BUS. That's where the XPS 9550 sees it being connected at x2 3.0, rather than x4 3.0, constricting the amount of data down the whole link.
3. hwinfo64 utility clearly shows a x2 3.0 root bridge link on the XPS 9550 [ see opening post ]
4. The definitive test of end-to-end communication capacity is a CUDA-Z bandwidth test. Ask your Chinese colleague with the XPS 9550 to run it. I expect to see results come back in the < 1400MiB/s range (TB2) rather than > 2200MiB/s (TB3).
I have been considering buying a 9360 16gb ram 512gb for 3 weeks now with the intention of adding an egpu. Luckily, I stumbled across this feed and have been paying a lot of attention to it. Thanks for all of the great information!
I concluded last night that I would buy the laptop and build a gaming PC In the future due to its lack of x4 3.0. So, I bought the laptop direct from DELL/UK to find out that it won’t be shipped until 1st FEB because it needs to be built. I wonder if with the introduction of the new 13 2in1 whether they might have updated the MOBO to include x4 3.0? I realise I’m maybe being a tad optimistic.
Does anyone have any updates as to whether the 2in1 supports x4 3.0? I couldn’t find any info it the link above.
Also what is your general experience in running games using your egpu at the restricted 16GB/s? I am trying to get an idea of whether I would buy one regardless. I would be running an external monitor thus not restricting the bandwidth as much. But with the cost of a RB Core at £500 + graphics card I think I could build a PC for a little bit more and get a lot of enjoyment out of it at the same time.
@Porg, there's a great reddit thread about the 2-in-1 (XPS 9365) and eGPU detection: https://www.reddit.com/r/eGPU/comments/5nhham/how_to_get_the_egpu_working_with_dell_xps_13_9365/
The 16Gbps restriction will give satisfactory results if using an external LCD. It's only if driving the internal, high-res LCD, that you'd want that extra bandwidth to give satisfactory results.
Have you considered a 13" HP Spectre 360 or Macbook Pro or even a XPS 9560 instead if want that full 32Gbps-TB3 performance? The former two confirmed to run 32Gbps-TB3 ports. A Dell log chat transcript was also posted on reddit that indicate this issue is to be corrected on the XPS 9560.
@Nando, thanks for your swift reply! I have since read about the 9365 supporting x4 3.0 which is great news, I would be interested in buying one if It wasn’t for their M style processors. As for your other recommendations, I have spent 5 minutes with all of them (apart from the 9560, which even though it will be tiny is still too big for my need) and the XPS 13 really stood out, plus graphical power to me is more of a want than a need so it will do me just fine, for the time being.
It is comforting to know that tb3 egpus can operate satisfactory with just 16gb/s bandwidth, provided that we are using an external monitor. I will wait a few months before I make the decision to either go egpu or DIY PC. Hopefully there will be more restricted egpu bench tests available to help determine which will give me the best bang/buck.
I have also read the emails from the dell rep stating that they have addressed the issue with the 9560, but I have also read some second-hand accounts from dell engineers who have said that the issue hasn’t been fixed, so I will believe it when I see it. I have been a dell customer for 10+ years. Their customer support can either be brilliant or utter shite and nothing in between. So we shall see.
Cheers for the help
Looks like DELL are producing a new motherboard to be released this month.
But this is to combat the coil whine issue, there are no details about increasing the x2 3.0. It would be silly not too
As they said in reddit, XPS 9560 is supposed that is 2x... 🙁
If anyone has a XPS 9560, can test if it works at 4x? There is no XPS 9560 where I live in Europe in order to try.
Some bad news for 9560 (probably everyone on this thread has already seen it)..