Post
Topic
Board Hardware
Re: Now that usb sticks are being sold by sidehack here is a new usb hub thread.
by
Namrok
on 21/06/2017, 02:22:58 UTC
You gotta consider a 2Pac at 150MHz is going to be pulling about 1.4 amps. That's not insignificant.

so drop the freq and/or get a more powerful hub?  suggestions on hub?

FYI,  I feel like an idiot for not realizing that it had to do with power per port.

I almost bought the 10 port Sipolar hub a few posts up that only provide 0.6 A per port.  Luckily I was able to cancel my order.  I must have been looking at hub specs so long I'd gotten confused about which hubs had which specs when I ordered it.  Maybe I got it confused with a different Sipolar 10 port model that did provide 2A per port.  No idea.

I'm currently running a pair of 2PACs on a Superbpag 7 port hub which is rated at 2A per port.  I have them up to 225Mhz which is as much as I dare with my current cooling solution.  Going by the spreadsheet on post 1 of the support thread, that should have them pulling something like 1.75A, especially since I have the vcore tuned as close I could without hardware errors.  But I suppose it could be a bit above that.  The heatsinks are warm enough to be uncomfortable to the touch, but not immediately yank my fingers away.  So I think I'm ok.

I'm hoping to get a few more 2PACs and then we'll see how well the hub holds up.  I think I read elsewhere that running this hub at 100% capacity with poor ventilation for extended periods killed it pretty hard though.  So we'll see how things progress.