Yep, 250mV. I run Geekbench to confirm on MacOS. I did repaste and heatpads.-250mV? I can barely get -125mV (on full load).
Have you run all stress tests (Prime95, 3D etc)
Also - are you using active cooling or heatpads?
Yep, 250mV. I run Geekbench to confirm on MacOS. I did repaste and heatpads.
Hi Mark,
Thanks for linking this. I'll give a try with the AppleALC and remove the Voodoo one and look into the sleep specific issues.
Thanks!
Yep, 250mV. I run Geekbench to confirm on MacOS. I did repaste and heatpads.
Did some further research after I thought a bit about this. 250 is the maximum range of the under/over-volt registers, as they're only 8-bit on the Dell. So unless there's a super-resistant die lattice out there, it's likely that you've just not enabled the registers for overclocking (which in turn should enable undervolting).
Also - and more pertinently, there should be higher GB scores with each step you undervolt, as you are further away from the TDP ceiling. What are the GB differences, say at 0, -125, -250?
Setting: CFG Lock, Variable: 0x4DE
Option: Disabled, Value: 0x0
Option: Enabled, Value: 0x1 (default)
Setting: OverClocking Feature, Variable: 0x64D
Option: Disabled, Value: 0x0 (default)
Option: Enabled, Value: 0x1
Setting: XTU Interface, Variable: 0x64E
Option: Disabled, Value: 0x0 (default)
Option: Enabled, Value: 0x1
0x4DE -> 00
0x64D -> 01
0x64E -> 01
That should get you going. Then experiment with undervolting and report back.
0x4DE -> 00 (was already set)
0x64D -> 01 (changed)
0x64E -> 01 (changed)
VoltageShift values:
-(any number) -(any number) -75 (max before freeze)
No improvement/change in GeekBench scores.
In other words, it appears the BIOS modifications did not unlock undervolt capabilities. No change in results from prior to changing the BIOS.