Hello all,
So I have a brand new Core i5 750 and Asus P55 motherboard on the way and I've been reading as many reviews/guides as I can about overclocking this new setup.
One thing that keeps lurking/popping up is something that hasn't really been an issue since the Pentium II/III/IV days: the PCI bus being locked to the base/bus clock. Basically, from what I understand, you have to increase the base clock in 33 MHz increments in order to not overclock your actual PCIe component bus (video card, etc). Doing so usually affects overall stability more than the fact that the CPU is overclocked.
From Anand's article:
"Unfortunately the PCIe controller on Lynnfield is tied to the BCLK. Increase the BCLK to overclock your CPU and you're also increasing the PCIe controller frequency. This doesn't play well with most PCIe cards, so the first rule of thumb is to try and stay at 133MHz multiples when increasing your BCLK."
Can anyone confirm or deny this? Does it basically come down to the BIOS on the motherboard you're using? If it is true then I'm only going to be happy with 133/166/200 base clocks and nothing in-between... and 166 would be a clock Anand was not able to achieve with turbo on, so I doubt I will be able to, which is dissapointing.
Thoughts?
So I have a brand new Core i5 750 and Asus P55 motherboard on the way and I've been reading as many reviews/guides as I can about overclocking this new setup.
One thing that keeps lurking/popping up is something that hasn't really been an issue since the Pentium II/III/IV days: the PCI bus being locked to the base/bus clock. Basically, from what I understand, you have to increase the base clock in 33 MHz increments in order to not overclock your actual PCIe component bus (video card, etc). Doing so usually affects overall stability more than the fact that the CPU is overclocked.
From Anand's article:
"Unfortunately the PCIe controller on Lynnfield is tied to the BCLK. Increase the BCLK to overclock your CPU and you're also increasing the PCIe controller frequency. This doesn't play well with most PCIe cards, so the first rule of thumb is to try and stay at 133MHz multiples when increasing your BCLK."
Can anyone confirm or deny this? Does it basically come down to the BIOS on the motherboard you're using? If it is true then I'm only going to be happy with 133/166/200 base clocks and nothing in-between... and 166 would be a clock Anand was not able to achieve with turbo on, so I doubt I will be able to, which is dissapointing.
Thoughts?