I've been overclocking my E0 E8400 incrementally since I built my new system last fall. I seem to be stuck at a plateau and I'm looking for any suggestions on the P5Q-Pro that can help me past it.
This is my "everyday" configuration and has been stable through many days of Prime 95, IntelBurnTest and months of gaming:
FSB 450 (4.05GHz)
PCIE 100
DRAM Freq 901MHz
CPU v 1.275
vdroop 1.26
DRAM v Auto
NB v Auto
Max temps (8 hours Prime 95)
C1 temp 44ºC
C2 temp 44ºC
Any BIOS settings not specified are AUTO
After some voltage tweaks and stress testing I came to this. Note the .05v jump required as well as 10ºC temp gains just for 270MHz.
Lots of incremental tweaking to get to the next stable overclock. Again a .05v jump and now a 7ºC temp jump just to get 45MHZ.
I definitely seemed to have hit the point of diminishing returns. More vcores are returning far less an increase in CPU.
If I go above 480 FSB (say, 485 or 490) I can boot but after 16 minutes in Prime 95 I always error out. Specifically, I can always pass all iterations of this:
But the very first iteration of this always fails on both cores:
I've raised NB v to 1.3 during the attempts at 485-490 FSB with no luck and have had CPU v up to 1.38125 BIOS/1.368 vdroop. Seeing as my last two increments both required .05v jumps I'm not quite ready to put 1.425v to my beloved E8400.
Any other mobo tweaks I can try to liberate a bit more? I was hoping to hit 4.5GHz but just can't seem to make it past this.
Thanks!
This is my "everyday" configuration and has been stable through many days of Prime 95, IntelBurnTest and months of gaming:
FSB 450 (4.05GHz)
PCIE 100
DRAM Freq 901MHz
CPU v 1.275
vdroop 1.26
DRAM v Auto
NB v Auto
Max temps (8 hours Prime 95)
C1 temp 44ºC
C2 temp 44ºC
Any BIOS settings not specified are AUTO
After some voltage tweaks and stress testing I came to this. Note the .05v jump required as well as 10ºC temp gains just for 270MHz.
*Stable 8 hours Prime 95*
FSB 475 (4.275GHz)
PCIE 100
DRAM Freq 951MHz
CPU v 1.3250
vdroop 1.312
DRAM v 2.05
NB v 1.26
Max temps (8+ hours Prime 95)
C1 temp 55ºC
C2 temp 53ºC
Any BIOS settings not specified are AUTO
FSB 475 (4.275GHz)
PCIE 100
DRAM Freq 951MHz
CPU v 1.3250
vdroop 1.312
DRAM v 2.05
NB v 1.26
Max temps (8+ hours Prime 95)
C1 temp 55ºC
C2 temp 53ºC
Any BIOS settings not specified are AUTO
Lots of incremental tweaking to get to the next stable overclock. Again a .05v jump and now a 7ºC temp jump just to get 45MHZ.
*Stable 8 hours Prime 95*
FSB 480 (4.32GHz)
PCIE 100
DRAM Freq 961
CPU v 1.3750
vdroop 1.360
DRAM v 2.10
NB v 1.28
Max temps (8+ hours Prime 95)
C1 temp 62ºC
C2 temp 60ºC
Any BIOS settings not specified are AUTO
FSB 480 (4.32GHz)
PCIE 100
DRAM Freq 961
CPU v 1.3750
vdroop 1.360
DRAM v 2.10
NB v 1.28
Max temps (8+ hours Prime 95)
C1 temp 62ºC
C2 temp 60ºC
Any BIOS settings not specified are AUTO
I definitely seemed to have hit the point of diminishing returns. More vcores are returning far less an increase in CPU.
If I go above 480 FSB (say, 485 or 490) I can boot but after 16 minutes in Prime 95 I always error out. Specifically, I can always pass all iterations of this:
4000 Lucas-Lehmer iterations of Mxxxxxxxx using FFT length 1024k
But the very first iteration of this always fails on both cores:
800000 Lucas-Lehmer iterations of Mxxxxxxxx using FFT length 8k
I've raised NB v to 1.3 during the attempts at 485-490 FSB with no luck and have had CPU v up to 1.38125 BIOS/1.368 vdroop. Seeing as my last two increments both required .05v jumps I'm not quite ready to put 1.425v to my beloved E8400.
Any other mobo tweaks I can try to liberate a bit more? I was hoping to hit 4.5GHz but just can't seem to make it past this.
Thanks!
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