Finally took the courage and decided to use LLC. Took a step back to 4.7GHz since I figured it would be much easier than trying to stabilize 4.8GHz which I'm having difficulty with.
Did some test with different LLC setting with fixed Vcore voltage of 1.35V on my Asrock Z68 Extreme 4 to see how it will affect the overall Vcore voltage.
With LLC Level 5 & Vcore fixed at 1.35V
- BIOS read 1.264V
- CPU-Z read 1.304V for Idle (Vdrop of est.0.05V)
- CPU-Z read 1.240V for Load (Vdroop of est. 0.06V)
With LLC Level 4 & Vcore fixed at 1.35V
- BIOS read 1.280V
- CPU-Z read 1.32V for Idle (Vdrop of est. 0.03V)
- CPU-Z read 1.26V for Load (Vdroop of est. 0.06V)
With LLC Level 3 & Vcore fixed at 1.35V
- BIOS read 1.304V
- CPU-Z read 1.328V for Idle (Vdrop of est. 0.02V)
- CPU-Z read 1.288V for Load (Vdroop of est. 0.04V)
Next, I switch back to default LLC Level 5 and use offset value for my Vcore. Did several tests on different offset value and found out that using offset -0.015V gives me the original BIOS Vcore reading of 1.264V which is the exact same reading I get from using LLC Level 5 and Vcore fixed value of 1.35V.
I repeated the same tests I did earlier with different LLC setting but with offset value this time round to make sure I get the same result as when I'm using fixed Vcore value. Got the same result? Checked!
Maintaining the same offset value of -0.015V and 47x Multiplier, I changed my LLC level to 3 and run Prime95 Blend test for 8hrs to check for stability issue.
8hrs later... No BSOD! Yippee!
Vcore reading when Idle
Vcore reading when Load
LLC Level 4 would probably eliminate the vdrop/vdroop but didn't want to do that since more vdrop/vdroop means lower level of spike when load changes, right? Might be wrong, I have no proof for it, just something I thought up of. To make me feel better in using LLC I guess.
Next, will be trying out for 4.8GHz.Edited by loftystew - 6/16/11 at 5:26am