PCIe x16 slot - characteristics: 3.3V, PME

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SamathaV

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Jan 6, 2016
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Used Speccy to get info about the motherboard I have. It has the following PCIe x16 -slot. What does the characteristics mean? Is this an ordinary PCIe x16 -slot or is there something special about it?

Slot PCI-E Gen 2
Slot Type: PCI-E Gen 2
Slot Usage: In Use
Data lanes: x16
Slot Designation: Slot1
Characteristics: 3.3V, PME
Slot Number: 0
 
Solution
k1114
With an external connector the gpu draws most of its power from there. Tom's used to show info of both power draw and it depends on the card. Some had spikes over the 75w limit, some would only go to 40w or less. People have upgraded the psu and ran more power hungry cards without issues on there.
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SamathaV

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Jan 6, 2016
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Thank you for the reply. That much I got from wikipedia (and nothing more), about the PME. What I am trying to figure out is the following.

In this spec (p. 19) is stated that OptiPlex-790 has wattage limitation of 35 on this slot. However, there has been several working builds with GPU's that require more than 35W, and some people had speculated that the limitation is not exactly real, but more of a recommendation in relation to the default PSU, that is rather weak (around 265W, depending on sub-model) .

So, I started to investigate. When I finally got OptiPlex-790 at my hands, with Speccy I could find out that the motherboard is Dell 0hy9jp. In the spec that I could find for it, there is no mention about the wattage limit. And then, from Speccy I got the info I pasted in the OP.

 
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SamathaV

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Jan 6, 2016
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Assuming the limit is real, would this cause problem when using GPU that has external power connectors? Would it try to get the first 75W from the PCIe and run into the wall when it only gets 35, instead of just taking the rest from the PSU directly?


 
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k1114

k1114

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May 2, 2010
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With an external connector the gpu draws most of its power from there. Tom's used to show info of both power draw and it depends on the card. Some had spikes over the 75w limit, some would only go to 40w or less. People have upgraded the psu and ran more power hungry cards without issues on there.
 
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