Last night I was tuning my 980X and OC for Geekbench (for an OCN Competition) but I was having issues pushing my CB back. Removing memory sticks didn't seen to help a whole lot... CB stayed pretty near -115°C to -120°C the whole time... Made it back to -130°C or so in single channel, but it wasn't always consistent (sometimes it would hard lock at -125°C).
Does playing with the skews help move that around?
Here are the voltages I was using:
VCore - 1.785V
QPI/VTT - 1.435V
PLL - 1.60V
QPI PLL - 1.32V
IOH - 1.26V
DRAM - 1.86V
Clock skews - 800 / 900
All PWM frequency switches were set to max (1 KHz? Can't remember)
Here's what I've tried:
I lowered my Uncore frequency and lowered QPI/VTT to 1.315V.
I tried raising PLL to 1.70V, but haven't tried 1.50V (derp, should have tried that).
I tried triple, dual, and single channel memory. In my past experience (with a different chip), this made a significant difference, a la -110°C triple channel, -135*°C dual channel, -150°C to full pot single channel.
Chip seems strong... It can do Geekbench in triple channel at -110°C at 5.9GHz. Dual channel at -120°C and 6GHz. I gave a half-assed attempt at Pi and validation. Validated 6.5 and passed 1M at around 6.15GHz (but didn't beat my previous score, so I didn't save).
I'll try 1.50V CPU PLL next time. Any other advice? Should I lower my QPI/VTT even more?
Results:
[hwbot=3095872]submission[/hwbot]
[hwbot=3095873]submission[/hwbot]
[hwbot=3095874]submission[/hwbot]
Photos: