Your hardware didn't change, still PCIe2.0. Now GPUs are correctly identified and run at 5.0GT/s. Changing slots won't change anything for PCIe SSDs.
There can be a big difference.
Those PCIe 3.0 X4 SSD can only negotiate at PCIe 1.0 X4 natively in slot 2 (for 4,1/5,1) without any PCIe switch inside the connection (before the firmware update).
If the slot 2 can properly negotiate at PCIe 2.0 X4 with those SSD, their sequential performance will be doubled.
And this will make the 4,1/5,1 can use two NVMe in RAID 0 to achieve 3000MB/s by installing one SSD in slot 2 and one SSD in slot 3 with those cheap adaptor.
This wasn’t possible before. Because the NVMe will be limited to 750MB/s in slot 2 (without the help of those expensive adaptor e.g. High Point 7101A), and cause the whole SSD RAID 0 limited to 750MB/s x2, which is only 1500MB/.
If install the SSD in slot 3 and 4, due to there are only 4 lanes for slot 3 and 4 to share. The ultimate speed is still 1500MB/s.
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Check "About This Mac">"System Report">"PCI" and see what it says about Link Speed.
It's cosmetic, I have always measured 5.0 GT/s with my MVC flashed Nvidia cards, even though the PCI report says 2.5 GT/s, as is does now.
Lou
I also want to know if there is anything changed. There are four cases. We need at least two cards to done all the checks.
1) flashed card, no loading
2) flashed card, with loading (e.g. CUDA-Z), THEN open system info PCIe Page.
3) unflashed card, no loading
4) unflashed card, with loading (e.g. CUDA-Z), THEN open system info PCIe Page.
So far, we know 1 and 3 will shows 2.5GT/s, nothing changed after firmware update.
But 2 and 4 still need tests to confirm.
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Vega FE is normally a hot card.
But stay at 80C with low fan speed seems not quite right. Do you know the fan profile, target temperature etc for the Vega FE?