So, is it possible to see the status of the 96 cores per die?
Reason I ask is, when I got these, before I tweaked voltages / cooler mounting etc... I remember the MHav over a 10hr period was right around 650GH per hab @ 850mhz
Which, 850 * 96 * 2 * 4 = 652GH ... add the HW% and the 650GH sounds about right.
After tweaking the waterblock heads, voltages and messing w/ clocks ... I have the cooler hab running at 875mhz, 1mv higher than stock, it shows no dropouts(due to not enough voltage) in the pepper app .. after a few hours of mining, its only showing 645GHav ... it should be closer to 660-670 .. HW% is largely unchanged.
So, Im confused as hell, if I put it back to 850mhz, its right around 630GHav now =(
My other hab, Im not able to get it stable at 875mhz, so its at 850mhz ... its showing the same drop, down to 630GH now =/
So, Im wondering, is it possible for individual cores or an engine in a core just die / not work and go unnoticed? Hence why Im wondering if its possible to see the status?
I have no idea whats causing this random drop.
My temperatures are all well within range too.... help!
I have noticed this sometimes happens as well. It's a peculiarity of the chip, and a little more voltage usually cures it. Remember there are two kinds of hardware errors, one is where a share is submitted that shouldn't be; cgminer will see this and flag it as a HW error. The other is a dark HW error, where a specific bit of work should give a valid share but doesn't. This one won't get reported as a HW error, since cgminer doesn't know it's happened.
There seems to be a small zone between where work stops noticeable enough to affect temperatures that you can see in the PepperApp, and normal operation where (probably) valid nonces don't get reported.
As a general rule, we shipped the boards with the voltage set high enough to get the 650GH/s we advertised, and most will hit 875MHz at that voltage as well. It's a compromise between power consumption and overclocking ability. If your temperatures are still good, I'd try giving it another 10mV and see if the hashrate moves to what you expect.
Yeah, this sucks, I guess they are damaged now somehow, no idea, Ive upped the voltage plenty on the 875mhz one and, temps are till under 100C but hashrate are still stuck at 645-650GH
Even tried next mv setting up for the one at 850mhz and it has no effect, just runs hotter ... ugh, its hashrate still at 630-635GH
So, somewhere Im losing 3% on each one =*(
What do the 3 buttons do? more specifically the reconfig one, does that restore firmware defaults or allow firmware installation?
Also, like in my original post, any way to see the status of each 96 cores?
Thanks